Hi, zookeeper-3.2.2 is used out of HBase 0.20.5 Linux sjc1-.com 2.6.18-92.el5 #1 SMP Tue Jun 10 18:51:06 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
In hbase-hadoop-zookeeper-sjc1-cml-grid00.log, I see a lot of the following: 2010-08-26 22:58:01,930 INFO org.apache.zookeeper.server.NIOServerCnxn: closing session:0x0 NIOServerCnxn: java.nio.channels.SocketChannel[connected local=/10.201.9.40:2181 remote=/10.201.9.22:63316] 2010-08-26 22:58:02,097 INFO org.apache.zookeeper.server.NIOServerCnxn: Connected to /10.201.9.22:63317 lastZxid 4004 2010-08-26 22:58:02,097 WARN org.apache.zookeeper.server.NIOServerCnxn: Client has seen zxid 0xfa4 our last zxid is 0x42 2010-08-26 22:58:02,097 WARN org.apache.zookeeper.server.NIOServerCnxn: Exception causing close of session 0x0 due to java.io.IOException: Client has seen zxid 0xfa4 our last zxid is 0x42 If you can shed some thought on root cause, that would be great.