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From Liam Slusser <lslus...@gmail.com>
Subject Re: oldWALs: what it is and how can I clean it?
Date Fri, 27 Feb 2015 21:29:57 GMT
Once I disable/remove the replication, can I just blow away the oldWALs
folder safely?

On Fri, Feb 27, 2015 at 3:10 AM, Madeleine Piffaretti <
mpiffaretti@powerspace.com> wrote:

> Thanks a lot!
>
> Indeed, we had a replication enable in the past because we used the
> hbase-indexer from NgData (use to replicate data from Hbase to Solr).
> The replication was disable from a long time but the hbase-indexer peer was
> still activated and so, as you mentioned, the data was keept  to guarantee
> to not lose data between disable and enable.
>
> I have removed the peer and empty the oldWALs folder.
>
>
>
> 2015-02-27 1:42 GMT+01:00 Liam Slusser <lslusser@gmail.com>:
>
> > Huge thanks, Enis, that was the information I was looking for.
> >
> > Cheers!
> > liam
> >
> >
> > On Thu, Feb 26, 2015 at 3:48 PM, Enis Söztutar <enis.soz@gmail.com>
> wrote:
> >
> > > @Madeleine,
> > >
> > > The folder gets cleaned regularly by a chore in master. When a WAL file
> > is
> > > not needed any more for recovery purposes (when HBase can guaratee
> HBase
> > > has flushed all the data in the WAL file), it is moved to the oldWALs
> > > folder for archival. The log stays there until all other references to
> > the
> > > WAL file are finished. There is currently two services which may keep
> the
> > > files in the archive dir. First is a TTL process, which ensures that
> the
> > > WAL files are kept at least for 10 min. This is mainly for debugging.
> You
> > > can reduce this time by setting hbase.master.logcleaner.ttl
> configuration
> > > property in master. It is by default 600000. The other one is
> > replication.
> > > If you have replication setup, the replication processes will hang on
> to
> > > the WAL files until they are replicated. Even if you disabled the
> > > replication, the files are still referenced.
> > >
> > > You can look at the logs from master from classes (LogCleaner,
> > > TimeToLiveLogCleaner, ReplicationLogCleaner) to see whether the master
> is
> > > actually running this chore and whether it is getting any exceptions.
> > >
> > > @Liam,
> > > Disabled replication will still hold on to the WAL files because,
> because
> > > it has a guarantee to not lose data between disable and enable. You can
> > > remove_peer, which frees up the WAL files to be eligible for deletion.
> > When
> > > you re-add replication peer again, the replication will start from the
> > > current status, versus if you re-enable a peer, it will continue from
> > where
> > > it left.
> > >
> > >
> > >
> > > On Thu, Feb 26, 2015 at 12:56 AM, Madeleine Piffaretti <
> > > mpiffaretti@powerspace.com> wrote:
> > >
> > > > Hi,
> > > >
> > > > The replication is not turned on HBase...
> > > > Does this folder should be clean regularly? Because I have data from
> > > > december 2014...
> > > >
> > > >
> > > > 2015-02-26 1:40 GMT+01:00 Liam Slusser <lslusser@gmail.com>:
> > > >
> > > > > I'm having this same problem.  I had replication enabled but have
> > since
> > > > > been disabled.  However oldWALs still grows.  There are so many
> files
> > > in
> > > > > there that running "hadoop fs -ls /hbase/oldWALs" runs out of
> memory.
> > > > >
> > > > > On Wed, Feb 25, 2015 at 9:27 AM, Nishanth S <
> nishanth.2884@gmail.com
> > >
> > > > > wrote:
> > > > >
> > > > > > Do you have replication turned on in hbase and  if so is your
> slave
> > > > > >  consuming the replicated data?.
> > > > > >
> > > > > > -Nishanth
> > > > > >
> > > > > > On Wed, Feb 25, 2015 at 10:19 AM, Madeleine Piffaretti <
> > > > > > mpiffaretti@powerspace.com> wrote:
> > > > > >
> > > > > > > Hi all,
> > > > > > >
> > > > > > > We are running out of space in our small hadoop cluster
so I
> was
> > > > > checking
> > > > > > > disk usage on HDFS and I saw that most of the space was
> occupied
> > by
> > > > > the*
> > > > > > > /hbase/oldWALs* folder.
> > > > > > >
> > > > > > > I have checked in the "HBase Definitive Book" and others
books,
> > > > > web-site
> > > > > > > and I have also search my issue on google but I didn't
find a
> > > proper
> > > > > > > response...
> > > > > > >
> > > > > > > So I would like to know what does this folder, what is
use for
> > and
> > > > also
> > > > > > how
> > > > > > > can I free space from this folder without breaking
> everything...
> > > > > > >
> > > > > > >
> > > > > > > If it's related to a specific version... our cluster is
under
> > > > > > > 5.3.0-1.cdh5.3.0.p0.30 from cloudera (hbase 0.98.6).
> > > > > > >
> > > > > > > Thx for your help!
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>

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