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Posted to common-dev@hadoop.apache.org by "Kishen Das (Jira)" <ji...@apache.org> on 2021/04/23 19:04:00 UTC
[jira] [Created] (HADOOP-17657) SequeneFile.Writer should implement
StreamCapabilities
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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