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From stack <st...@duboce.net>
Subject Re: revert of HDFS-127? (was Re: Vote on hbase-0.20.3RC1)
Date Tue, 12 Jan 2010 20:28:00 GMT
(Andrew, see hdfs-127 on its tail for update)

Zlatin:

IMO, its better keeping hdfs-127.  You actually can't run an hbase cluster
of any size without it.  The rate at which files go bad -- dfsclient turns
into a zombie after accumulating 3 errors after any 3 transient failures --
does the cluster a mortal blow.  The scenario where all replicas go away is
relatively rare and probably indicative of a more serious hdfs issue though,
according to the issue, when it happens, its ugly with dfsclient going into
an infinite loop.

St.Ack


On Tue, Jan 12, 2010 at 12:05 PM, Andrew Purtell <apurtell@apache.org>wrote:

> Hi,
>
> > Out of curiosity, since HDFS-127 was recently deemed harmful and
> > reverted, will 0.20.3 still ship with patched version of Hadoop?
>
> Do you have a reference for that?
>
> > Do you still recommend that patch be applied when running Hbase?
>
> We needed that patch so long running HBase processes could ride over
> intermittent DFS problems. Otherwise, the stream would become
> unusable as soon as the errors accumulate, like the issue discusses.
>
> It may still be an important patch for HBase even though there is
> some problem with it otherwise.
>
>   - Andy
>
>
>
> ----- Original Message ----
> > From: "Zlatin.Balevsky@barclayscapital.com" <
> Zlatin.Balevsky@barclayscapital.com>
> > To: hbase-dev@hadoop.apache.org
> > Sent: Tue, January 12, 2010 11:34:49 AM
> > Subject: RE: Vote on hbase-0.20.3RC1
> >
> > Out of curiosity, since HDFS-127 was recently deemed harmful and
> > reverted, will 0.20.3 still ship with patched version of Hadoop?
> >
> > Do you still recommend that patch be applied when running Hbase?
> >
> > Zlatin
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