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https://issues.apache.org/jira/browse/HDFS-2263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176412#comment-13176412
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Harsh J commented on HDFS-2263:
-------------------------------
Ah but checksum errors are always reported properly (changing block data,
adding extra bits to start/end, etc.). How would we equate a
truncated/unreadable block to a checksum failure?
> Make DFSClient report bad blocks more quickly
> ---------------------------------------------
>
> Key: HDFS-2263
> URL: https://issues.apache.org/jira/browse/HDFS-2263
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs client
> Affects Versions: 0.20.2
> Reporter: Aaron T. Myers
> Assignee: Harsh J
> Attachments: HDFS-2263.patch
>
>
> In certain circumstances the DFSClient may detect a block as being bad
> without reporting it promptly to the NN.
> If when reading a file a client finds an invalid checksum of a block, it
> immediately reports that bad block to the NN. If when serving up a block a DN
> finds a truncated block, it reports this to the client, but the client merely
> adds that DN to the list of dead nodes and moves on to trying another DN,
> without reporting this to the NN.
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