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https://issues.apache.org/jira/browse/HDFS-13985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16719473#comment-16719473
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Daniel Templeton commented on HDFS-13985:
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Thanks' [~adam.antal]. I'm going to pick on the error message a bit. Can we
please make it, "The block may have been removed recently by the balancer or by
intentionally reducing the replication factor. This condition is usually
harmless. To be certain, please check the preceding datanode log messages for
signs of a more serious issue."
> Clearer error message for ReplicaNotFoundException
> --------------------------------------------------
>
> Key: HDFS-13985
> URL: https://issues.apache.org/jira/browse/HDFS-13985
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Reporter: Adam Antal
> Assignee: Adam Antal
> Priority: Major
> Attachments: HDFS-13985.001.patch, HDFS-13985.002.patch,
> HDFS-13985.002.patch
>
>
> The issue is that we came across a ReplicaNotFoundException in a bug report,
> the most informative thing we could get is "Replica not found for
> [ExtendedBlock]". If someone tries to investigate cases including
> ReplicaNotFoundExceptions should review diagnostic bundles, dig through logs,
> but as a starting point enhancing the exception message would boost this
> process, and be beneficial in the long run.
> More concretely, it would be helpful if any of the following information was
> displayed along with the exception: file's name, replication factor or block
> location.
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