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[ZOOKEEPER-1297] Add stat information to create() call - Zookeeper - [issue]
...In order to get a Stat object after creation one has to do another exists() call. This leaves client code vulnerable to a possible update window by another writer. All synchronous methods bu...
http://issues.apache.org/jira/browse/ZOOKEEPER-1297    Author: Gunnar Wagenknecht, 2013-12-24, 00:10
[ZOOKEEPER-1657] Increased CPU usage by unnecessary SASL checks - Zookeeper - [issue]
...I did some profiling in one of our Java environments and found an interesting footprint in ZooKeeper. The SASL support seems to trigger a lot times on the client although it's not even in us...
http://issues.apache.org/jira/browse/ZOOKEEPER-1657    Author: Gunnar Wagenknecht, 2013-09-25, 18:04
Re: Zookeeper as webapp Session Storage - Zookeeper - [mail # user]
...Hi,  On 2013-07-16 12:28:51 +0000, Stephane Gamard said:  The Jetty NoSql session storage is based on MogoDB.  I thought about using ZooKeeper for Jetty sessions storage as we...
   Author: Gunnar Wagenknecht, 2013-07-16, 15:35
Re: Zookeeper backward compatibility - Zookeeper - [mail # user]
...Hi,  On 2013-06-27 12:00:11 +0000, Monish r said:  We went through the process of updating our stack from 3.3.3 to 3.4.5.  It was possible to do a rolling update of the server...
   Author: Gunnar Wagenknecht, 2013-07-02, 07:25
CPU Increase in 3.4.5 Java Client caused by SASL - Zookeeper - [mail # user]
...Hi,  We noticed a significant CPU usage increase when deploying ZooKeeper  3.4.5 Java client. I've opened ticket ZOOKEEPER-1657 [1] with some  results from a profiling session...
   Author: Gunnar Wagenknecht, 2013-03-01, 17:07
Network issues? - Zookeeper - [mail # user]
...Hi,  I have noticed the following pattern in our cluster today:  The leader reports:  > Unexpected exception causing shutdown while sock still open  > java.io.EOFEx...
   Author: Gunnar Wagenknecht, 2012-12-06, 16:39
Re: Fatal Severe unrecoverable error and shutdown of OSGI framework - Zookeeper - [mail # user]
...Am 24.10.2012 16:02, schrieb Peter Wissel:  Without further information on the changes you were working on and how ZK is used ... this is just guessing ... but do you have all the neces...
   Author: Gunnar Wagenknecht, 2012-10-24, 14:16
ZooKeeper Cluster Crash resulted in not loadable database - Zookeeper - [mail # user]
...Hi,  I'm investigating a crash of a ZooKeeper 3.3.4 cluster. It seems that the cause of the crash was an issue in the networking layer. All the ZK server suddenly lost connections to cl...
   Author: Gunnar Wagenknecht, 2012-09-05, 07:43
[ZOOKEEPER-1100] Killed (or missing) SendThread will cause hanging threads - Zookeeper - [issue]
...After investigating an issues with hanging threads I noticed that any java.lang.Error might silently kill the SendThread. Without a SendThread any thread that wants to send something will ha...
http://issues.apache.org/jira/browse/ZOOKEEPER-1100    Author: Gunnar Wagenknecht, 2012-03-21, 04:04
Running an ensemble in one JVM - Zookeeper - [mail # user]
...Hi,  Is it possible to run an ensemble in one JVM?  I'd like to write some unit tests for our application in order to test the robustness of my application regarding connection los...
   Author: Gunnar Wagenknecht, 2011-10-19, 06:42
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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