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From Dhruba Borthakur <dhr...@gmail.com>
Subject Re: revert of HDFS-127? (was Re: Vote on hbase-0.20.3RC1)
Date Tue, 12 Jan 2010 23:11:26 GMT
Here is a JIRA that I opened after some offline discussion with Joydeep.

http://issues.apache.org/jira/browse/HDFS-826

This will allow a client  (e.g. Region Server) to periodically query the dfs
file handle to retrieve the number of currently active replicas. if the
number of replicas falls below 3, then the region server could close the
Hfile and open a new hfile. what do people think about that approach?

thanks,
dhruba


On Tue, Jan 12, 2010 at 12:28 PM, stack <stack@duboce.net> wrote:

> (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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