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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 reassigned HDFS-17332:
-------------------------------
Assignee: Xing Lin
> 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
> Assignee: 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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