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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7587) Edit log corruption can happen if append fails with a quota violation
Date Tue, 17 Mar 2015 21:38:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14366135#comment-14366135
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Jing Zhao commented on HDFS-7587:
---------------------------------

Thanks for the comment, Kihwal. Actually I mentioned this in my previous comment: with fix
from HDFS-7943 we will not have blocks with size greater than the preferred block size. But
I will appreciate if you can also confirm.

> Edit log corruption can happen if append fails with a quota violation
> ---------------------------------------------------------------------
>
>                 Key: HDFS-7587
>                 URL: https://issues.apache.org/jira/browse/HDFS-7587
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Kihwal Lee
>            Assignee: Jing Zhao
>            Priority: Blocker
>         Attachments: HDFS-7587.001.patch, HDFS-7587.002.patch, HDFS-7587.patch
>
>
> We have seen a standby namenode crashing due to edit log corruption. It was complaining
that {{OP_CLOSE}} cannot be applied because the file is not under-construction.
> When a client was trying to append to the file, the remaining space quota was very small.
This caused a failure in {{prepareFileForWrite()}}, but after the inode was already converted
for writing and a lease added. Since these were not undone when the quota violation was detected,
the file was left in under-construction with an active lease without edit logging {{OP_ADD}}.
> A subsequent {{append()}} eventually caused a lease recovery after the soft limit period.
This resulted in {{commitBlockSynchronization()}}, which closed the file with {{OP_CLOSE}}
being logged.  Since there was no corresponding {{OP_ADD}}, edit replaying could not apply
this.



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