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 < mpiffare...@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 <lslus...@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....@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 < > > > mpiffare...@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 <lslus...@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.2...@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 < > > > > > > mpiffare...@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! > > > > > > > > > > > > > > > > > > > > > > > > > > > >
