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https://issues.apache.org/jira/browse/FLUME-1219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on FLUME-1219 started by Mike Percy.
> Race conditions in BucketWriter / HDFSEventSink
> -----------------------------------------------
>
> Key: FLUME-1219
> URL: https://issues.apache.org/jira/browse/FLUME-1219
> Project: Flume
> Issue Type: Bug
> Reporter: Mike Percy
> Assignee: Mike Percy
> Attachments: FLUME-1219-1.patch
>
>
> BucketWriter has several race conditions that came up during my performance
> testing over the weekend. One issue that caused data loss was the lack of
> atomic close() and open() semantics related to the "retry" mechanism after
> the abort() call in HDFSEventSink.process().
> Another issue is the lack of clearly delineated responsibilities for calling
> open(), flush(), close(), etc. For example, HDFSEventSink.start() calls
> open(), HDFSEventSink.process() calls and abort() which calls open(), and
> BucketWriter.append() also calls close() and open().
> There is another race condition related to the JVM shutdown hooks, which
> cause .tmp files not to be renamed.
> These APIs need to be refactored and their responsibilities need to be
> clarified.
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