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Flume, mail # dev - Review Request: FLUME-1660 Close "idle" hdfs handles

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Re: Review Request: FLUME-1660 Close "idle" hdfs handles
Juhani Connolly 2012-10-31, 10:49

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(Updated Oct. 31, 2012, 10:49 a.m.)
Review request for Flume and Mike Percy.

Implemented the described suggestions:
- Added a callback interface to HDFSEventSink
- uses a scheduled future to close stuff once the bucket writer has been idle too long.
- onIdleTimeout callback will now remove the bucketWriter from sfWriters, cleaning up that leak(though this is only the case of idleTimeout is non-0)
- Added hdfs.idleTimeout configuration setting to hdfs sink, default is 0. Perhaps we should consider enabling it by default with a reasonably long default timeout?

Tested on local hdfs, confirmed that the config option is working and that files are indeed getting closed. I also verified in the debugger that the sfWriter entries were actually getting deleted.

Added lastWrite to BucketWriter to verify when it was last updated

Added a thread to HDFSEventSink which verifies the last update of each active bucketWriter and closes them after the configurable timeout hdfs.closeIdleTimeout has passed.
This addresses bug FLUME-1660.
Diffs (updated)

  flume-ng-doc/sphinx/FlumeUserGuide.rst c1303e0
  flume-ng-sinks/flume-hdfs-sink/src/main/java/org/apache/flume/sink/hdfs/BucketWriter.java 9f2c763
  flume-ng-sinks/flume-hdfs-sink/src/main/java/org/apache/flume/sink/hdfs/HDFSEventSink.java e369604
  flume-ng-sinks/flume-hdfs-sink/src/test/java/org/apache/flume/sink/hdfs/TestBucketWriter.java 6a8072e

Diff: https://reviews.apache.org/r/7659/diff/

Local machine testing was performed and the correct closing of files was confirmed, as well as the correct behavior of the configuration setting including disabling the feature(by using the default value for hdfs.closeIdleTimeout of 0)
There is one unrelated test failure which I'm not sure of(if anyone knows what's causing this, please let me know)

Failed tests:   testInOut(org.apache.flume.test.agent.TestFileChannel): Expected FILE_ROLL sink's dir to have only 1 child, but found 0 children. expected:<1> but was:<0>

All other tests pass.

Juhani Connolly