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Posted to common-issues@hadoop.apache.org by "Steve Loughran (Jira)" <ji...@apache.org> on 2021/11/09 14:08:00 UTC
[jira] [Updated] (HADOOP-17657) SequenceFile.Writer should
implement StreamCapabilities
[ https://issues.apache.org/jira/browse/HADOOP-17657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Loughran updated HADOOP-17657:
------------------------------------
Summary: SequenceFile.Writer should implement StreamCapabilities (was: SequeneFile.Writer should implement StreamCapabilities)
> SequenceFile.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
> Fix For: 3.3.1, 3.4.0
>
> Time Spent: 3h 50m
> 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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