Kishen Das created HADOOP-17657:
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Summary: 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
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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