[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.015.patch
Rebased patch.
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch,
> HDFS-6984.009.patch, HDFS-6984.010.patch, HDFS-6984.011.patch,
> HDFS-6984.012.patch, HDFS-6984.013.patch, HDFS-6984.014.patch,
> HDFS-6984.015.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.014.patch
Rebased patch
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch,
> HDFS-6984.009.patch, HDFS-6984.010.patch, HDFS-6984.011.patch,
> HDFS-6984.012.patch, HDFS-6984.013.patch, HDFS-6984.014.patch,
> HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Release Note: FileStatus and FsPermission Writable serialization is
deprecated and its implementation (incompatibly) replaced with protocol
buffers. The FsPermissionProto record moved from hdfs.proto to acl.proto.
HdfsFileStatus is now a subtype of FileStatus. FsPermissionExtension with its
associated flags for ACLs, encryption, and erasure coding has been deprecated;
users should query these attributes on the FileStatus object directly.
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch,
> HDFS-6984.009.patch, HDFS-6984.010.patch, HDFS-6984.011.patch,
> HDFS-6984.012.patch, HDFS-6984.013.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.013.patch
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch,
> HDFS-6984.009.patch, HDFS-6984.010.patch, HDFS-6984.011.patch,
> HDFS-6984.012.patch, HDFS-6984.013.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.012.patch
* Added more tests
* Removed {{FlaggedFileStatus}} class to preserve attribute flags for all
FileStatus objects, through serialization
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch,
> HDFS-6984.009.patch, HDFS-6984.010.patch, HDFS-6984.011.patch,
> HDFS-6984.012.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.011.patch
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch,
> HDFS-6984.009.patch, HDFS-6984.010.patch, HDFS-6984.011.patch,
> HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.010.patch
No worries; thanks for the thorough review, Andrew.
I'll run this through Jenkins again, fix up snapshots, and we can finish this.
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch,
> HDFS-6984.009.patch, HDFS-6984.010.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Status: Patch Available (was: Open)
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch,
> HDFS-6984.009.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.009.patch
Sorry for the noise caused by using Jenkins to run tests. I was trying to avoid
an explicit {{Flags}} type for HdfsFileStatus, but if {{feInfo}} is not present
for directories in encryption zones, it's probably cleaner this way.
We could add a different API for resolving whether some set of
features/capabilities are available/applied for a given
{{FileSystem}}/{{FileStatus}}, and avoid the {{EnumSet}} in the constructor,
but this issue has sprawled far enough. At least it's not in the user-facing
API.
This restores the {{FsPermissionExtension}} on the client side (for
applications calling the deprecated methods). If the flags are not set (on
older servers) it sets the flags from the old permission bits. For backwards
compatibility with 2.x clients, we can either keep setting the permission bits
server side or backport the flags to branch-2 for the "2.x version compatible
with 3.x clusters" release. Any opinions on this? It's simplest to keep setting
the bits server-side, and deleting that code when we remove
{{FsPermissionExtension}}.
I also had a question about snapshots. I'm not certain whether EC and
encryption zones work with them. The current patch doesn't handle ACLs, but I
wanted to get a quick check on that before digging through the implementation.
[~andrew.wang], are you OK with the general direction of v009?
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch,
> HDFS-6984.009.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Status: Open (was: Patch Available)
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch,
> HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.008.patch
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.008.patch,
> HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.007.patch
Fix some warnings, fix some tests. Will add additional tests for the PB
serialization/deserialization.
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.007.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.006.patch
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.006.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.005.patch
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.005.patch,
> HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Status: Patch Available (was: Open)
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Status: Open (was: Patch Available)
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: (was: HDFS-6984.004.patch)
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.004.patch
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Status: Open (was: Patch Available)
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Status: Patch Available (was: Open)
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Status: Open (was: Patch Available)
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Status: Patch Available (was: Open)
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.004.patch
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.004.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andrew Wang updated HDFS-6984:
--
Attachment: HDFS-6984.nowritable.patch
Here's the sample patch I used to remove Writable.
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch, HDFS-6984.nowritable.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
--
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andrew Wang updated HDFS-6984:
--
Target Version/s: 3.0.0-alpha2 (was: )
Setting target version for tracking.
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Douglas updated HDFS-6984:
Attachment: HDFS-6984.003.patch
Rebased [~cmccabe]'s patch.
* Changed {{FileStatus}} to be {{Serializable}}, per [~ste...@apache.org]'s
suggestion. This cascaded to a few other classes, which I halted at
{{HdfsBlockLocation}} (changing the final ref to transient). Looking through
its usage this is probably correct, since the fields not redundant with
{{BlockLocation}} are things like tokens, which are internal(?) to DFSClient.
* Changed required fields to {{}} from {{}}. mtime in particular isn't always cheap
on some systems, and the owner/group/perms may be -lies- placeholders if the FS
is required to populate them. The {{filetype}} is arguable. YARN overwhelmingly
favors {{optional}} fields for everything, FWIW.
* Changed field IDs to match {{HdfsFileStatusProto}}. In proto2 at least, this
cross-serialization works (added a test). In HDFS-7878, {{FileStatus}} can
leave its {{PathHandle}} as {{bytes}}, provided they occupy the same field ID.
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0-alpha1
>Reporter: Colin P. McCabe
>Assignee: Colin P. McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch,
> HDFS-6984.003.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andrew Wang updated HDFS-6984:
--
Hadoop Flags: Incompatible change
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0
>Reporter: Colin Patrick McCabe
>Assignee: Colin Patrick McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Colin Patrick McCabe updated HDFS-6984:
---
Description:
FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this to
serialize it and send it over the wire. But in Hadoop 2 and later, we have the
protobuf {{HdfsFileStatusProto}} which serves to serialize this information.
The protobuf form is preferable, since it allows us to add new fields in a
backwards-compatible way. Another issue is that already a lot of subclasses of
FileStatus don't override the Writable methods of the superclass, breaking the
interface contract that read(status.write) should be equal to the original
status.
In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
that we don't have to deal with these issues. It's probably too late to do
this in Hadoop 2, since user code may be relying on the existing FileStatus
serialization there.
was:
FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this to
serialize it and send it over the wire. But in Hadoop 2 and later, we have the
protobuf {{HdfsFileStatusProto}} which serves to serialize this information.
The protobuf form is preferable, since it allows us to add new fields in a
backwards-compatible way. Another issue is that already a lot of subclasses of
FileStatus don't override the Writable methods of the superclass, breaking the
interface contract that read(status.write) should be equal to the original
status.
In Hadoop 3, we should just make FileStatus no longer a writable so that we
don't have to deal with these issues. It's probably too late to do this in
Hadoop 2, since user code may be relying on the ability to use the Writable
methods on FileStatus objects there.
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0
>Reporter: Colin Patrick McCabe
>Assignee: Colin Patrick McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus serialize itself via protobuf so
> that we don't have to deal with these issues. It's probably too late to do
> this in Hadoop 2, since user code may be relying on the existing FileStatus
> serialization there.
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[jira] [Updated] (HDFS-6984) In Hadoop 3, make FileStatus serialize itself via protobuf
[
https://issues.apache.org/jira/browse/HDFS-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Colin Patrick McCabe updated HDFS-6984:
---
Summary: In Hadoop 3, make FileStatus serialize itself via protobuf (was:
In Hadoop 3, make FileStatus no longer a Writable)
> In Hadoop 3, make FileStatus serialize itself via protobuf
> --
>
> Key: HDFS-6984
> URL: https://issues.apache.org/jira/browse/HDFS-6984
> Project: Hadoop HDFS
> Issue Type: Improvement
>Affects Versions: 3.0.0
>Reporter: Colin Patrick McCabe
>Assignee: Colin Patrick McCabe
> Labels: BB2015-05-TBR
> Attachments: HDFS-6984.001.patch, HDFS-6984.002.patch
>
>
> FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this
> to serialize it and send it over the wire. But in Hadoop 2 and later, we
> have the protobuf {{HdfsFileStatusProto}} which serves to serialize this
> information. The protobuf form is preferable, since it allows us to add new
> fields in a backwards-compatible way. Another issue is that already a lot of
> subclasses of FileStatus don't override the Writable methods of the
> superclass, breaking the interface contract that read(status.write) should be
> equal to the original status.
> In Hadoop 3, we should just make FileStatus no longer a writable so that we
> don't have to deal with these issues. It's probably too late to do this in
> Hadoop 2, since user code may be relying on the ability to use the Writable
> methods on FileStatus objects there.
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