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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13112) Token expiration edits may cause log corruption or deadlock
Date Tue, 06 Feb 2018 17:59:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16354240#comment-16354240
] 

Daryn Sharp commented on HDFS-13112:
------------------------------------

Submit is pending HADOOP-15212.

> Token expiration edits may cause log corruption or deadlock
> -----------------------------------------------------------
>
>                 Key: HDFS-13112
>                 URL: https://issues.apache.org/jira/browse/HDFS-13112
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.1.0-beta, 0.23.8
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HDFS-13112.patch
>
>
> HDFS-4477 specifically did not acquire the fsn lock during token cancellation based on
the belief that edit logs are thread-safe.  However, log rolling is not thread-safe.  Failure
to externally synchronize on the fsn lock during a roll will cause problems.
> For sync edit logging, it may cause corruption by interspersing edits with the end/start
segment edits.  Async edit logging may encounter a deadlock if the log queue overflows.  Luckily,
losing the race is extremely rare.  In ~5 years, we've never encountered it.  However, HDFS-13051
lost the race with async edits.



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