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Re: MultiMaster HBase: --backup really needed ? - HBase - [mail # user]
...The problem with having a bunch of master racing is that it's not evident for the operator who won, so specifying --backup to all but one master ensures that you always easily know where the...
   Author: Jean-Daniel Cryans, 2013-12-09, 17:44
[HBASE-9211] "ERROR: undefined method `message' for nil:NilClass" in the shell on error - HBase - [issue]
...Not sure where this is coming from but since today if I try to create a table that already exists in the shell I get:ERROR: undefined method `message' for nil:NilClassinstead of the normal e...
http://issues.apache.org/jira/browse/HBASE-9211    Author: Jean-Daniel Cryans, 2013-12-02, 08:24
[HBASE-8275] Tool to test binary compatibility - HBase - [issue]
...Stack and I were discussing of ways to make binary compatibility easier to test than doing it completely by hand.One idea would be to have a tool that uses reflection to generate code that c...
http://issues.apache.org/jira/browse/HBASE-8275    Author: Jean-Daniel Cryans, 2013-11-27, 23:29
[HBASE-8561] [replication] Don't instantiate a ReplicationSource if the passed implementation isn't found - HBase - [issue]
...I was debugging a case where the region servers were dying with:ABORTING region server someserver.com,60020,1368123702806: Writing replication status org.apache.zookeeper.KeeperException$NoN...
http://issues.apache.org/jira/browse/HBASE-8561    Author: Jean-Daniel Cryans, 2013-11-27, 23:25
[HBASE-9322] Contention on the SoftValueSortedMap with multiple clients - HBase - [issue]
...I've been running tests on clusters with "lots" of regions, about 400, and I'm seeing weird contention in the client.This one shows up a lot around the SoftValueSortedMap.First I have this b...
http://issues.apache.org/jira/browse/HBASE-9322    Author: Jean-Daniel Cryans, 2013-11-23, 20:06
[HBASE-4654] [replication] Add a check to make sure we don't replicate to ourselves - HBase - [issue]
...It's currently possible to add a peer for replication and point it to the local cluster, which I believe could very well happen for those like us that use only one ZK ensemble per DC so that...
http://issues.apache.org/jira/browse/HBASE-4654    Author: Jean-Daniel Cryans, 2013-11-14, 21:04
[HBASE-3680] Publish more metrics about mslab - HBase - [issue]
...We have been using mslab on all our clusters for a while now and it seems it tends to OOME or send us into GC loops of death a lot more than it used to. For example, one RS with mslab enable...
http://issues.apache.org/jira/browse/HBASE-3680    Author: Jean-Daniel Cryans, 2013-11-14, 09:03
[HBASE-4741] Online schema change doesn't return errors - HBase - [issue]
...Still after the fun I had over in HBASE-4729, I tried to finish altering my table (remove a family) since only half of it was changed so I did this:hbase(main):002:0> alter 'TestTable', N...
http://issues.apache.org/jira/browse/HBASE-4741    Author: Jean-Daniel Cryans, 2013-11-08, 20:53
[HBASE-9898] Have a way to set a different default compression on HCD - HBase - [issue]
...I was exploring if there would be a nice way to set the compression by default to a different algorithm but I didn't find any that I can implement right now, dumping my ideas so that others ...
http://issues.apache.org/jira/browse/HBASE-9898    Author: Jean-Daniel Cryans, 2013-11-06, 00:27
Re: You Are Dead Exception due to promotion failure - HBase - [mail # user]
...It reads that it spent 89 seconds doing a CMS concurrent mark, but really just spent 14 seconds of user CPU and 4 seconds of system CPU doing it. Where are the other 70 seconds? It's often j...
   Author: Jean-Daniel Cryans, 2013-11-01, 15:27
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