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https://issues.apache.org/jira/browse/HADOOP-855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12462310
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Wendy Chien commented on HADOOP-855:
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If the replication level is one, then we will keep the corrupt block and report
the error.
> 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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