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HDFS, mail # dev - persistent under-replicated blocks


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Cooper Bethea 2014-01-08, 20:00
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Cooper Bethea 2014-01-09, 02:00
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Chris Embree 2014-01-09, 04:40
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Steve Loughran 2014-01-09, 09:33
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Cooper Bethea 2014-01-09, 18:34
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Cooper Bethea 2014-01-09, 18:46
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Andrew Wang 2014-01-09, 21:56
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Cooper Bethea 2014-01-09, 22:17
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Re: persistent under-replicated blocks
Chris Embree 2014-01-09, 05:05
Hm, I had hoped this would have been fixed in hdfs 2.  I have a script that
I run several times per day that identifies under replicated blocks and
increases the replication factor by 1.  It then reduces the replication
factor back to normal.

I can dig up a link if you need it.
On Jan 8, 2014 9:00 PM, "Cooper Bethea" <[EMAIL PROTECTED]> wrote:

> Following on--is there a way that I can forcibly replicate these blocks,
> perhaps by rsyncing the underlying files to other datanodes? As you might
> imagine under-replicated data makes me very uneasy.
>
>
> On Wed, Jan 8, 2014 at 12:00 PM, Cooper Bethea <[EMAIL PROTECTED]
> >wrote:
>
> > Hi HDFS developers,
> >
> > I have a worrying problem in a 2.0.0-cdh4.4.0 HDFS cluster I am running.
> 9
> > blocks in the cluster are persistently reported to be under-replicated
> per
> > "hdfs fsck".
> >
> > I am able to fetch the files that contain these blocks, so I know that
> the
> > data is there, but for some reason replication is not taking effect. In
> > hopes of getting the cluster to notice that there were under-replicated
> > blocks I tried using "hdfs dfs -setrep" to raise the replication factor,
> > but the cluster continues to report a single replica for each of these
> > blocks. When viewing master logs I see that the replication factor change
> > is respected, but there are no messages that refer to the
> under-replicated
> > blocks.
> >
> > Thanks for your time. Please let me know what I can do to investigate
> > further.
> >
>