[jira] [Updated] (HDFS-2751) Datanode drops OS cache behind reads even for short reads
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https://issues.apache.org/jira/browse/HDFS-2751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Foley updated HDFS-2751:
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Fix Version/s: (was: 1.2.0)
1.1.0
Datanode drops OS cache behind reads even for short reads
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Key: HDFS-2751
URL: https://issues.apache.org/jira/browse/HDFS-2751
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 0.23.0, 0.24.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Fix For: 0.24.0, 0.23.1, 1.1.0
Attachments: HDFS-2751.branch-1.patch, hdfs-2751.txt, hdfs-2751.txt
HDFS-2465 has some code which attempts to disable the drop cache behind
reads functionality when the reads are 256KB (eg HBase random access). But
this check was missing in the {{close()}} function, so it always drops cache
behind reads regardless of the size of the read. This hurts HBase random read
performance when this patch is enabled.
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[jira] [Updated] (HDFS-2751) Datanode drops OS cache behind reads even for short reads
[
https://issues.apache.org/jira/browse/HDFS-2751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Matt Foley updated HDFS-2751:
-
Target Version/s: 0.23.0, 0.24.0, 1.1.0 (was: 0.23.0, 0.24.0)
Datanode drops OS cache behind reads even for short reads
-
Key: HDFS-2751
URL: https://issues.apache.org/jira/browse/HDFS-2751
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 0.23.0, 0.24.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Fix For: 0.24.0, 0.23.1, 1.1.0
Attachments: HDFS-2751.branch-1.patch, hdfs-2751.txt, hdfs-2751.txt
HDFS-2465 has some code which attempts to disable the drop cache behind
reads functionality when the reads are 256KB (eg HBase random access). But
this check was missing in the {{close()}} function, so it always drops cache
behind reads regardless of the size of the read. This hurts HBase random read
performance when this patch is enabled.
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[jira] [Updated] (HDFS-2751) Datanode drops OS cache behind reads even for short reads
[
https://issues.apache.org/jira/browse/HDFS-2751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Tsz Wo (Nicholas), SZE updated HDFS-2751:
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Fix Version/s: 1.2.0
I have committed the backport patch to branch-1. Thanks, Brandon!
Datanode drops OS cache behind reads even for short reads
-
Key: HDFS-2751
URL: https://issues.apache.org/jira/browse/HDFS-2751
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 0.23.0, 0.24.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Fix For: 0.24.0, 0.23.1, 1.2.0
Attachments: HDFS-2751.branch-1.patch, hdfs-2751.txt, hdfs-2751.txt
HDFS-2465 has some code which attempts to disable the drop cache behind
reads functionality when the reads are 256KB (eg HBase random access). But
this check was missing in the {{close()}} function, so it always drops cache
behind reads regardless of the size of the read. This hurts HBase random read
performance when this patch is enabled.
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[jira] [Updated] (HDFS-2751) Datanode drops OS cache behind reads even for short reads
[
https://issues.apache.org/jira/browse/HDFS-2751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Brandon Li updated HDFS-2751:
-
Attachment: HDFS-2751.branch-1.patch
Datanode drops OS cache behind reads even for short reads
-
Key: HDFS-2751
URL: https://issues.apache.org/jira/browse/HDFS-2751
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 0.23.0, 0.24.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Fix For: 0.24.0, 0.23.1
Attachments: HDFS-2751.branch-1.patch, hdfs-2751.txt, hdfs-2751.txt
HDFS-2465 has some code which attempts to disable the drop cache behind
reads functionality when the reads are 256KB (eg HBase random access). But
this check was missing in the {{close()}} function, so it always drops cache
behind reads regardless of the size of the read. This hurts HBase random read
performance when this patch is enabled.
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[jira] [Updated] (HDFS-2751) Datanode drops OS cache behind reads even for short reads
[
https://issues.apache.org/jira/browse/HDFS-2751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Todd Lipcon updated HDFS-2751:
--
Attachment: hdfs-2751.txt
Reattaching same patch to kick jenkins
Datanode drops OS cache behind reads even for short reads
-
Key: HDFS-2751
URL: https://issues.apache.org/jira/browse/HDFS-2751
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 0.23.0, 0.24.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Attachments: hdfs-2751.txt, hdfs-2751.txt
HDFS-2465 has some code which attempts to disable the drop cache behind
reads functionality when the reads are 256KB (eg HBase random access). But
this check was missing in the {{close()}} function, so it always drops cache
behind reads regardless of the size of the read. This hurts HBase random read
performance when this patch is enabled.
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[jira] [Updated] (HDFS-2751) Datanode drops OS cache behind reads even for short reads
[
https://issues.apache.org/jira/browse/HDFS-2751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Todd Lipcon updated HDFS-2751:
--
Resolution: Fixed
Fix Version/s: 0.23.1
0.24.0
Target Version/s: 0.23.0, 0.24.0 (was: 0.24.0, 0.23.0)
Hadoop Flags: Reviewed
Status: Resolved (was: Patch Available)
Test failure was unrelated. Committed to trunk and 23.
Datanode drops OS cache behind reads even for short reads
-
Key: HDFS-2751
URL: https://issues.apache.org/jira/browse/HDFS-2751
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 0.23.0, 0.24.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Fix For: 0.24.0, 0.23.1
Attachments: hdfs-2751.txt, hdfs-2751.txt
HDFS-2465 has some code which attempts to disable the drop cache behind
reads functionality when the reads are 256KB (eg HBase random access). But
this check was missing in the {{close()}} function, so it always drops cache
behind reads regardless of the size of the read. This hurts HBase random read
performance when this patch is enabled.
--
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[jira] [Updated] (HDFS-2751) Datanode drops OS cache behind reads even for short reads
[
https://issues.apache.org/jira/browse/HDFS-2751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Todd Lipcon updated HDFS-2751:
--
Target Version/s: 0.23.0, 0.24.0 (was: 0.24.0, 0.23.0)
Status: Patch Available (was: Open)
Datanode drops OS cache behind reads even for short reads
-
Key: HDFS-2751
URL: https://issues.apache.org/jira/browse/HDFS-2751
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 0.23.0, 0.24.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Attachments: hdfs-2751.txt
HDFS-2465 has some code which attempts to disable the drop cache behind
reads functionality when the reads are 256KB (eg HBase random access). But
this check was missing in the {{close()}} function, so it always drops cache
behind reads regardless of the size of the read. This hurts HBase random read
performance when this patch is enabled.
--
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