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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-855) HDFS should repair corrupted files
Date Thu, 04 Jan 2007 20:09:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12462306
] 

Doug Cutting commented on HADOOP-855:
-------------------------------------

> we also need one for the checksum file

Ah, I get it.  That sounds reasonable.  Thanks for clarifying!

> Should we also try to figure out which of the two was corrupt?

I don't think it's worth it, at least not for the first pass.

What should we do if the replication level is one for the corrupt block?  Keep it, I think.

> HDFS should repair corrupted files
> ----------------------------------
>
>                 Key: HADOOP-855
>                 URL: https://issues.apache.org/jira/browse/HADOOP-855
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Wendy Chien
>         Assigned To: Wendy Chien
>
> While reading if we discover a mismatch between a block and checksum, we want to report
this back to the namenode to delete the corrupted block or crc.
> To implement this, we need to do the following:
> DFSInputStream
> 1. move DFSInputStream out of DFSClient
> 2. add member variable to keep track of current datanode (the chosen node)
> DistributedFileSystem
> 1. change reportChecksumFailure parameter crc from int to FSInputStream (needed to be
able to delete it). 
> 2. determine specific block and datanode from DFSInputStream passed to reportChecksumFailure
 
> 3. call namenode to delete block/crc vis DFSClient
> ClientProtocol
> 1. add method to ask namenode to delete certain blocks on specifc datanode.
> Namenode
> 1. add ability to delete certain blocks on specific datanode

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