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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11817) A faulty node can cause a lease leak and NPE on accessing data
Date Fri, 19 May 2017 22:36:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11817?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee updated HDFS-11817:
------------------------------
    Attachment: HDFS-11817.branch-2.patch

I started the patch for branch-2.8 and branch-2.  The trunk version is not ready yet, but
want to run the branch-2 version through precommit before the weekend.

> A faulty node can cause a lease leak and NPE on accessing data
> --------------------------------------------------------------
>
>                 Key: HDFS-11817
>                 URL: https://issues.apache.org/jira/browse/HDFS-11817
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.8.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>         Attachments: HDFS-11817.branch-2.patch, hdfs-11817_supplement.txt
>
>
> When the namenode performs a lease recovery for a failed write, the {{commitBlockSynchronization()}}
will fail, if none of the new target has sent a received-IBR.  At this point, the data is
inaccessible, as the namenode will throw a {{NullPointerException}} upon {{getBlockLocations()}}.
> The lease recovery will be retried in about an hour by the namenode. If the nodes are
faulty (usually when there is only one new target), they may not block report until this point.
If this happens, lease recovery throws an {{AlreadyBeingCreatedException}}, which causes LeaseManager
to simply remove the lease without  finalizing the inode.  
> This results in an inconsistent lease state. The inode stays under-construction, but
no more lease recovery is attempted. A manual lease recovery is also not allowed. 



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