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https://issues.apache.org/jira/browse/HADOOP-17657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HADOOP-17657 started by Kishen Das.
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> SequeneFile.Writer should implement StreamCapabilities
> ------------------------------------------------------
>
> Key: HADOOP-17657
> URL: https://issues.apache.org/jira/browse/HADOOP-17657
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Kishen Das
> Assignee: Kishen Das
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> Following exception is thrown whenever we invoke ProtoMessageWriter.hflush on
> S3 from Tez, which internally calls
> org.apache.hadoop.io.SequenceFile$Writer.hflush -> org.apache.hadoop.fs.FS
> DataOutputStream.hflush -> S3ABlockOutputStream.hflush which is not
> implemented and throws java.lang.UnsupportedOperationException.
> bdffe22d96ae [mdc@18060 class="yarn.YarnUncaughtExceptionHandler"
> level="ERROR" thread="HistoryEventHandlingThread"] Thread
> Thread[HistoryEventHandlingThread, 5,main] threw an
> Exception.^Mjava.lang.UnsupportedOperationException: S3A streams are not
> Syncable^M at
> org.apache.hadoop.fs.s3a.S3ABlockOutputStream.hflush(S3ABlockOutputStream.java:657)^M
> at org.apache.hadoop.fs.FS
> DataOutputStream.hflush(FSDataOutputStream.java:136)^M at
> org.apache.hadoop.io.SequenceFile$Writer.hflush(SequenceFile.java:1367)^M at
> org.apache.tez.dag.history.logging.proto.ProtoMessageWriter.hflush(ProtoMessageWr
> iter.java:64)^M at
> org.apache.tez.dag.history.logging.proto.ProtoHistoryLoggingService.finishCurrentDag(ProtoHistoryLoggingService.java:239)^M
> at org.apache.tez.dag.history.logging.proto.ProtoHistoryLoggingService.han
> dleEvent(ProtoHistoryLoggingService.java:198)^M at
> org.apache.tez.dag.history.logging.proto.ProtoHistoryLoggingService.loop(ProtoHistoryLoggingService.java:153)^M
> at java.lang.Thread.run(Thread.java:748)^M
> In order to fix this issue we should implement StreamCapabilities in
> SequenceFile.Writer. Also, we should fall back to flush(), if hflush() is not
> supported.
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