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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2263) Make DFSClient report bad blocks more quickly
Date Wed, 17 Aug 2011 00:09:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13086056#comment-13086056
] 

Aaron T. Myers commented on HDFS-2263:
--------------------------------------

I've confirmed this issue exists in the 0.20-security branch, and I bet it exists in 0.23
as well but haven't checked yet.

> 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
>
> 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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