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Posted to dev@flume.apache.org by "Mike Percy (JIRA)" <ji...@apache.org> on 2017/05/08 21:06:04 UTC
[jira] [Resolved] (FLUME-3085) HDFS Sink can skip flushing some
BucketWriters, might lead to data loss
[ https://issues.apache.org/jira/browse/FLUME-3085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mike Percy resolved FLUME-3085.
-------------------------------
Resolution: Fixed
Pushed to trunk.
> HDFS Sink can skip flushing some BucketWriters, might lead to data loss
> -----------------------------------------------------------------------
>
> Key: FLUME-3085
> URL: https://issues.apache.org/jira/browse/FLUME-3085
> Project: Flume
> Issue Type: Bug
> Components: Sinks+Sources
> Affects Versions: 1.7.0
> Reporter: Denes Arvay
> Assignee: Denes Arvay
> Priority: Critical
> Fix For: 1.8.0
>
>
> The {{HDFSEventSink.process()}} is already prepared for a rare race condition, namely when the BucketWriter acquired in [line 389|https://github.com/apache/flume/blob/trunk/flume-ng-sinks/flume-hdfs-sink/src/main/java/org/apache/flume/sink/hdfs/HDFSEventSink.java#L389] gets closed by an other thread (e.g. because the {{idleTimeout}} or the {{rollInterval}}) before the {{append()}} is called in [line 406|https://github.com/apache/flume/blob/trunk/flume-ng-sinks/flume-hdfs-sink/src/main/java/org/apache/flume/sink/hdfs/HDFSEventSink.java#L406].
> If this is the case the {{BucketWriter.append()}} call throws a {{BucketClosedException}} and the sink creates a new {{BucketWriter}} instance and appends to it.
> But this newly created instance won't be added to the {{writers}} list, which means that it won't be flushed after the processing loop finished: https://github.com/apache/flume/blob/trunk/flume-ng-sinks/flume-hdfs-sink/src/main/java/org/apache/flume/sink/hdfs/HDFSEventSink.java#L429
> This has multiple consequences:
> - unflushed data might get lost
> - the {{BucketWriter}}'s {{idleAction}} won't be scheduled (https://github.com/apache/flume/blob/trunk/flume-ng-sinks/flume-hdfs-sink/src/main/java/org/apache/flume/sink/hdfs/BucketWriter.java#L450), which means that it won't be closed nor renamed if the idle timeout is the only trigger for closing the file.
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