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Posted to hdfs-dev@hadoop.apache.org by Chris Douglas <ch...@gmail.com> on 2009/10/20 00:55:30 UTC

Re: [VOTE] port HDFS-127 (DFSClient block read failures cause open DFSInputStream to become unusable) to hadoop 0.20/0.21

+1 This fix has been in limbo for a long time; thanks for finishing
it, Nicholas. -C

On Mon, Oct 19, 2009 at 2:34 PM, Tsz Wo (Nicholas), Sze
<s2...@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
>
>

Re: [VOTE] port HDFS-127 (DFSClient block read failures cause open DFSInputStream to become unusable) to hadoop 0.20/0.21

Posted by Dhruba Borthakur <dh...@gmail.com>.

+1.

On Mon, Oct 19, 2009 at 3:55 PM, Chris Douglas <ch...@gmail.com>wrote:

> +1 This fix has been in limbo for a long time; thanks for finishing
> it, Nicholas. -C
>
> On Mon, Oct 19, 2009 at 2:34 PM, Tsz Wo (Nicholas), Sze
> <s2...@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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