[jira] [Updated] (HDFS-4516) Client crash after block allocation and NN switch before lease recovery for the same file can cause readers to fail forever

["Vinay (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-4516?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinay updated HDFS-4516:
------------------------

    Attachment: HDFS-4516.patch

Attaching the latest rebased patch for this issue.

Please somebody take a look at the patch. 
This is very important issue as this would fail the reading of entire file if the last block have zero locations due to client crash.

> Client crash after block allocation and NN switch before lease recovery for the same file can cause readers to fail forever
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4516
>                 URL: https://issues.apache.org/jira/browse/HDFS-4516
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 3.0.0, 2.0.3-alpha
>            Reporter: Uma Maheswara Rao G
>            Assignee: Vinay
>            Priority: Critical
>         Attachments: HDFS-4516-Test.patch, HDFS-4516.patch, HDFS-4516.patch, HDFS-4516.patch, HDFS-4516.txt
>
>
> If client crashes just after allocating block( blocks not yet created in DNs) and NN also switched after this, then new Namenode will not know about locs.
> Further details will be in comment.



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