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https://issues.apache.org/jira/browse/HDFS-13112?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daryn Sharp updated HDFS-13112:
-------------------------------
Status: Patch Available (was: Open)
> 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: 0.23.8, 2.1.0-beta
> 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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