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[ZOOKEEPER-1214] QuorumPeer should unregister only its previsously registered MBeans instead of use MBeanRegistry.unregisterAll() method. - Zookeeper - [issue]
...When a QuorumPeer thread dies, it is unregistering all ZKMBeanInfo MBeans previously registered on its java process; including those that has not been registered by itself.It does not cause ...
http://issues.apache.org/jira/browse/ZOOKEEPER-1214    Author: César Álvarez Núñez, 2014-05-20, 12:09
[ZOOKEEPER-1172] Support for custom org.apache.zookeeper.client.HostProvider implementation. - Zookeeper - [issue]
...The interface org.apache.zookeeper.client.HostProvider exist but it is hardcoded to org.apache.zookeeper.client.StaticHostProvider at Zookeeper constructor.Now it could be replaced by any ot...
http://issues.apache.org/jira/browse/ZOOKEEPER-1172    Author: César Álvarez Núñez, 2014-04-10, 04:38
[ZOOKEEPER-1043] Looped NPE at org.apache.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:244) - Zookeeper - [issue]
...I'm sorry but I only have this log (which belongs to a "follower" node) and a previous message Unexpected NodeCreated event after a reconnection. where I describe a potential side-effect at ...
http://issues.apache.org/jira/browse/ZOOKEEPER-1043    Author: César Álvarez Núñez, 2013-04-27, 08:44
Re: ZooKeeper 3.4.3: Failed to unregister with JMX - Zookeeper - [mail # user]
...Hi Michi,  The following patch ZOOKEEPER-1214is needed in order to restart a QuorumPeer when running in embedded mode.  Could you try it again with ZK-1214 applied?  BR, /Césa...
   Author: César Álvarez Núñez, 2012-07-29, 11:22
[expand - 1 more] - Re: Can Observers be reconfigured in a DR situation? - Zookeeper - [mail # user]
...I've changed a server from Observer to Leader under a similar scenario (data migration form old DC to new DC) without any problem. Just stop all servers, change the configuration and start u...
   Author: César Álvarez Núñez, 2012-07-10, 14:54
[expand - 2 more] - Re: Unexpected NodeCreated with 3.4.3? - Zookeeper - [mail # user]
...Now it is broken the opposite use case: Expected NodeCreated but received NodeDataChanged :-( Detected on ZooKeeper 3.3.5 and 3.4.3+ZK-1412 /César.  On Fri, May 25, 2012 at 11:41 AM, Cé...
   Author: César Álvarez Núñez, 2012-05-25, 11:21
Re: How to delete ZNode with 200K items - Zookeeper - [mail # user]
...Hi Jordan,  We had the same problem a few months ago. Are you getting an IOException("Unreasonable length = " + len) on client side? You have to set the system property "jute.maxbuffer"...
   Author: César Álvarez Núñez, 2012-05-24, 22:05
[expand - 1 more] - Re: Should Stat.dataLength return -1 instead of 0 when node content is null? - Zookeeper - [mail # dev]
...Hi Patrick,  I thoroughly agree with your opinion.  When you say "major version upgrade", you mean an increase on the 2nd digit (for example from 3.4.X to 3.5.X) or the first digit...
   Author: César Álvarez Núñez, 2012-05-18, 08:19
[expand - 3 more] - Re: ZooKeeper Memory Usage - Zookeeper - [mail # user]
...This is the java.env file content.  now=`date +%d%m%Y_%H%M%S`  gcLogFile="/srv/zk/GC/`hostname`-${now}.log" gcOpts="${gcOpts} -Xloggc:$gcLogFile" gcOpts="${gcOpts} -XX:+PrintGC" gc...
   Author: César Álvarez Núñez, 2012-02-10, 11:32
Re: use cases for asynchronous API - Zookeeper - [mail # user]
...Almost all my zk agents use asynchronous api; mainly because all services are intrinsically asynchronous. In fact I've wrapped the Zookeeper client to hide synchronous methods; so anyone who...
   Author: César Álvarez Núñez, 2012-02-09, 10:22
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB