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From stack <st...@duboce.net>
Subject Re: [VOTE] port HDFS-127 (DFSClient block read failures cause open DFSInputStream to become unusable) to hadoop 0.20/0.21
Date Tue, 20 Oct 2009 17:21:30 GMT
+1

On Mon, Oct 19, 2009 at 2:34 PM, Tsz Wo (Nicholas), Sze <
s29752-hadoopdev@yahoo.com> wrote:

> DFSClient has a retry mechanism on block acquiring for read.  If the number
> of retries attends to a certain limit (defined by
> dfs.client.max.block.acquire.failures), DFSClient will throw a
> BlockMissingException back to the user application.  In the current
> implementation, DFSClient counts the failures across multiple block
> acquiring operations but the block acquiring operations are supposed to be
> independent.  HDFS-127 fixes this problem by counting the failures within a
> single operation.
>
> I propose to commit HDFS-127 to 0.20 and above since this fix is safe and
> very useful.
>
> Nicholas Sze
>
>

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