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https://issues.apache.org/jira/browse/HDFS-12217?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Manoj Govindassamy updated HDFS-12217:
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Description:
With the fix for HDFS-11402, HDFS Snapshots can additionally capture all the
open files. Just like all other files, these open files in the snapshots will
remain immutable. But, sometimes it is found that snapshots fail to capture all
the open files in the system.
Under the following conditions, LeaseManager will fail to find INode
corresponding to an active lease
* a file is opened for writing (LeaseManager allots a lease), and
* the same file is deleted while it is still open for writing and having active
lease, and
* the same file is not referenced in any other Snapshots/Trash
{{INode[] LeaseManager#getINodesWithLease()}} can thus return null for few
leases there by causing the caller to trip over and not return all the open
files needed by the snapshot manager.
was:
With the fix for HDFS-11402, HDFS Snapshots can additionally capture all the
open files. Just like all other files, these open files in the snapshots will
remain immutable. But, sometimes it is found that snapshots fail to capture all
the open files in the system.
Under the following conditions, LeaseManager will fail to find INode
corresponding to an active lease
* file is opened for writing (LeaseManager allots a lease), and
* files is deleted while it is still open for writing and active lease, and
* file is not referenced in any other Snapshots/Trash
{{INode[] LeaseManager#getINodesWithLease()}} can thus return null for few
leases there by causing the caller to trip over and not return all the open
files needed by the snapshot manager.
> HDFS snapshots doesn't capture all open files when one of the open files is
> deleted
> -----------------------------------------------------------------------------------
>
> Key: HDFS-12217
> URL: https://issues.apache.org/jira/browse/HDFS-12217
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: snapshots
> Affects Versions: 3.0.0-alpha1
> Reporter: Manoj Govindassamy
> Assignee: Manoj Govindassamy
>
> With the fix for HDFS-11402, HDFS Snapshots can additionally capture all the
> open files. Just like all other files, these open files in the snapshots will
> remain immutable. But, sometimes it is found that snapshots fail to capture
> all the open files in the system.
> Under the following conditions, LeaseManager will fail to find INode
> corresponding to an active lease
> * a file is opened for writing (LeaseManager allots a lease), and
> * the same file is deleted while it is still open for writing and having
> active lease, and
> * the same file is not referenced in any other Snapshots/Trash
> {{INode[] LeaseManager#getINodesWithLease()}} can thus return null for few
> leases there by causing the caller to trip over and not return all the open
> files needed by the snapshot manager.
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