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Re: Poor HBase map-reduce scan performance - HBase - [mail # user]
...You can try Yourkit, they have evaluation licenses. There is one gotcha: some classes are excluded by default, and this includes org.apache.* . So you need to change the default config when ...
   Author: Nicolas Liochon, 2013-05-02, 18:00
[HBASE-8303] Increse the test timeout to 60s when they are less than 20s - HBase - [issue]
...Short test timeouts are dangerous because: if the test is executed in the same jvm as another, GC, thread priority can play a role we don't know the machine used to execute the tests, nor wh...
http://issues.apache.org/jira/browse/HBASE-8303    Author: Nicolas Liochon, 2013-04-27, 16:55
[HBASE-6435] Reading WAL files after a recovery leads to time lost in HDFS timeouts when using dead datanodes - HBase - [issue]
...HBase writes a Write-Ahead-Log to revover from hardware failure. This log is written on hdfs.Through ZooKeeper, HBase gets informed usually in 30s that it should start the recovery process. ...
http://issues.apache.org/jira/browse/HBASE-6435    Author: Nicolas Liochon, 2013-04-26, 09:38
Re: [DISCUSS] Making hadoop 2 the default precommit for trunk ones we get green builds - HBase - [mail # dev]
...+1 as well.   On Fri, Apr 26, 2013 at 5:55 AM, Stack  wrote:  ...
   Author: Nicolas Liochon, 2013-04-26, 04:09
[HBASE-6290] Add a function a mark a server as dead and start the recovery the process - HBase - [issue]
...ZooKeeper is used a a monitoring tool: we use znode and we start the recovery process when a znode is deleted by ZK because it got a timeout. This timeout is defaulted to 90 seconds, and oft...
http://issues.apache.org/jira/browse/HBASE-6290    Author: Nicolas Liochon, 2013-04-25, 08:52
[HBASE-8380] NPE in HBaseClient$Connection.readResponse - HBase - [issue]
...Stack is:2013-04-19 09:22:45,991 WARN  [IPC Client (682317035) connection to ip-10-6-131-32.ec2.internal/10.6.131.32:60020 from root] ipc.HBaseClient (HBaseClient.java:run(664)) - IPC C...
http://issues.apache.org/jira/browse/HBASE-8380    Author: Nicolas Liochon, 2013-04-24, 19:50
Re: Slow region server recoveries - HBase - [mail # user]
...The recovery starts at 27:40 (master log: 00:27:40,011), so before the datanode is known as stale. But the first attempt is cancelled, and a new one start at 28:10, before being cancelled ag...
   Author: Nicolas Liochon, 2013-04-22, 07:51
[HBASE-8360] In HBaseClient#cancelConnections we should close fully the connection - HBase - [issue]
...If not the clients are not disconnected hence still depend on the timeout......
http://issues.apache.org/jira/browse/HBASE-8360    Author: Nicolas Liochon, 2013-04-20, 13:36
[HBASE-8374] NullPointerException when launching the balancer due to unknown region location - HBase - [issue]
...I don't reproduce this all the time, but I had it on a fairly clean env.It occurs every 5 minutes (i.e. the balancer period). Impact is severe: the balancer does not run. When it starts to o...
http://issues.apache.org/jira/browse/HBASE-8374    Author: Nicolas Liochon, 2013-04-20, 13:36
[HBASE-8382] NPE in HBaseServer$Connection.readAndProcess - HBase - [issue]
...2013-04-19 12:27:02,387 WARN  [IPC Server handler 8 on 60020] org.apache.hadoop.ipc.HBaseServer: IPC Server handler 8 on 60020: caught a ClosedChannelException, this means that the serv...
http://issues.apache.org/jira/browse/HBASE-8382    Author: Nicolas Liochon, 2013-04-19, 17:45
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