Operational problems with Zookeeper
This post is a summary of what has been presented by Kathleen Ting on StrangeLoop conference. You can watch the original here: http://www.infoq.com/presentations/Misconfiguration-ZooKeeper I’ve decided to put this selection here for quick reference. Connection mismanagement too many connections WARN [NIOServerCxn.Factory: 0.0.0.0/0.0.0.0:2181:NIOServerCnxn$Factory@247] - Too many connections from /xx.x.xx.xxx - max is 60 running out of ZK connections? set maxClientCnxns=200 in zoo.cfg HBase client leaking connections? fixed in HBASE-3777, HBASE-4773, HBASE-5466 manually close connections connection closes prematurely ...