[ https://issues.apache.org/jira/browse/FLUME-2973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Endre Major updated FLUME-2973:
-------------------------------
Attachment: FLUME-2973-min2.patch
> Deadlock in hdfs sink
> ---------------------
>
> Key: FLUME-2973
> URL: https://issues.apache.org/jira/browse/FLUME-2973
> Project: Flume
> Issue Type: Bug
> Components: Sinks+Sources
> Affects Versions: 1.7.0
> Reporter: Denes Arvay
> Assignee: Denes Arvay
> Priority: Critical
> Labels: hdfssink
> Fix For: 1.9.0
>
> Attachments: FLUME-2973-1.patch, FLUME-2973-min2.patch, FLUME-2973.patch
>
>
> Automatic close of BucketWriters (when open file count reached {{hdfs.maxOpenFiles}})
and the file rolling thread can end up in deadlock.
> When creating a new {{BucketWriter}} in {{HDFSEventSink}} it locks {{HDFSEventSink.sfWritersLock}}
and the {{close()}} called in {{HDFSEventSink.sfWritersLock.removeEldestEntry}} tries to lock
the {{BucketWriter}} instance.
> On the other hand if the file is being rolled in {{BucketWriter.close(boolean)}} it locks
the {{BucketWriter}} instance first and in the close callback it tries to lock the {{sfWritersLock}}.
> The chances for this deadlock is higher when the {{hdfs.maxOpenFiles}}'s value is low
(1).
> Script to reproduce: https://gist.github.com/adenes/96503a6e737f9604ab3ee9397a5809ff
> (put to {{flume-ng-sinks/flume-hdfs-sink/src/main/java/org/apache/flume/sink/hdfs}})
> Deadlock usually occurs before ~30 iterations.
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