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https://issues.apache.org/jira/browse/FLUME-1326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13819250#comment-13819250
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dave sinclair commented on FLUME-1326:
--------------------------------------
Hari,
I think the documentation may want to include a info/warning section
highlighting the potential memory issue if you have a high number of HDFS Sinks
on a node, or the filename/pathname changes often that causes a high number of
bucket writers to be created.
> OutOfMemoryError in HDFSSink
> ----------------------------
>
> Key: FLUME-1326
> URL: https://issues.apache.org/jira/browse/FLUME-1326
> Project: Flume
> Issue Type: Bug
> Affects Versions: v1.2.0
> Reporter: Juhani Connolly
> Priority: Critical
>
> We run a 3 node/1 collector test cluster pushing about 350events/sec per
> node... Not really high stress, but just something to evaluate flume with.
> Consistently our collector has been dying because of an OOMError killing the
> SinkRunner after running for about 30-40 hours(seems pretty consistent as
> we've had it 3 times now).
> Suspected cause would be a memory leak somewhere in HdfsSink. The feeder
> nodes which run AvroSink instead of HdfsSink have been up and running for
> about a week without restarts.
> flume-load/act-wap02/2012-06-26-17.1340697637324.tmp, packetSize=65557,
> chunksPerPacket=127, bytesCurBlock=29731328
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> 2012-06-26 17:12:56,080 (SinkRunner-PollingRunner-DefaultSinkProcessor)
> [ERROR -
> org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:411)]
> process failed
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> at java.util.Arrays.copyOfRange(Arrays.java:3209)
> at java.lang.String.<init>(String.java:215)
> at java.lang.StringBuilder.toString(StringBuilder.java:430)
> at
> org.apache.flume.formatter.output.BucketPath.escapeString(BucketPath.java:306)
> at
> org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:367)
> at
> org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:68)
> at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:147)
> at java.lang.Thread.run(Thread.java:619)
> Exception in thread "SinkRunner-PollingRunner-DefaultSinkProcessor"
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> at java.util.Arrays.copyOfRange(Arrays.java:3209)
> at java.lang.String.<init>(String.java:215)
> at java.lang.StringBuilder.toString(StringBuilder.java:430)
> at
> org.apache.flume.formatter.output.BucketPath.escapeString(BucketPath.java:306)
> at
> org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:367)
> at
> org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:68)
> at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:147)
> at java.lang.Thread.run(Thread.java:619)
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