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https://issues.apache.org/jira/browse/HDFS-17332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xing Lin updated HDFS-17332:
----------------------------
Environment: (was: In DFSInputStream#actualGetFromOneDataNode(), it
would send the exception stacktrace to the dfsClient.LOG whenever we fail on a
DN. However, in most cases, the read request will be served successfully by
reading from the next available DN. The existence of exception stacktrace in
the log has caused multiple hadoop users at Linkedin to consider this WARN
message as the RC/fatal error for their jobs. We would like to improve the log
message and avoid sending the stacktrace to dfsClient.LOG when a read succeeds.
The stackTrace when reading reach DN is sent to the log only when we really
need to fail a read request (when chooseDataNode()/refetchLocations() throws a
BlockMissingException). )
> DFSInputStream: avoid logging stacktrace until when we really need to fail a
> read request with a MissingBlockException
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-17332
> URL: https://issues.apache.org/jira/browse/HDFS-17332
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Reporter: Xing Lin
> Priority: Minor
>
> In DFSInputStream#actualGetFromOneDataNode(), it would send the exception
> stacktrace to the dfsClient.LOG whenever we fail on a DN. However, in most
> cases, the read request will be served successfully by reading from the next
> available DN. The existence of exception stacktrace in the log has caused
> multiple hadoop users at Linkedin to consider this WARN message as the
> RC/fatal error for their jobs. We would like to improve the log message and
> avoid sending the stacktrace to dfsClient.LOG when a read succeeds. The
> stackTrace when reading reach DN is sent to the log only when we really need
> to fail a read request (when chooseDataNode()/refetchLocations() throws a
> BlockMissingException).
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