今天在hbase中执行下面的命令

disable ‘iw:test06’
alter ‘iw:test06’,NAME=>‘i’,COMPRESSION=>‘SNAPPY’
count ‘iw:test06’
提示下面的异常信息

2018-01-15 10:49:20,660 [myid:2] - INFO [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1008] - Closed socket connection for client /192.168.5.172:29409 (no session established for client)
2018-01-15 10:49:22,559 [myid:2] - INFO [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxnFactory@192] - Accepted socket connection from /192.168.5.172:29444
2018-01-15 10:49:22,560 [myid:2] - WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@357] - caught end of stream exception
EndOfStreamException: Unable to read additional data from client sessionid 0x0, likely client has closed socket
at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:230)
at org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:203)
at java.lang.Thread.run(Thread.java:745)
执行命令netstat -antp | grep 2181,可以看到
EndOfStreamException: Unable to read additional data from client sessionid 0x0, likely client has cl_第1张图片
参考Hadoop 2.x常用端口及查看方法查看端口使用情况
在这篇文章Hadoop及HBase使用过程中的一些问题集中描述hb下面的regionserver全部掉线，其实不是zk的原因，而是hdfs的问题。
Unable to read additional data from client sessionid 0x0, likely client has closed socket这篇文章解释需要配置zookeeper.session.timeout.ms,而zookeeper中minSessionTimeout与maxSessionTimeout是tickTime的2倍和20倍。看来问题不在于此。
在http://192.168.5.174:16010/master-status中可以看到压缩后，原来Online Regions，现在变成了failed Regions.
EndOfStreamException: Unable to read additional data from client sessionid 0x0, likely client has cl_第2张图片
继续跟进hbase的日志

2018-01-16 10:05:55,864 INFO [RS_OPEN_REGION-dashuju172:16020-1] coordination.ZkOpenRegionCoordination: Opening of region {ENCODED => adf4db74cf8fee5f59a72536bbe5c866, NAME => ‘iw:test09,1516065176992.adf4db74cf8fee5f59a72536bbe5c866.’, STARTKEY => ‘’, ENDKEY => ‘18243bd709d84eaa87a52224c2a5f584_420321800520311_20170417’} failed, transitioning from OPENING to FAILED_OPEN in ZK, expecting version 22
2018-01-16 10:05:55,969 INFO [PriorityRpcServer.handler=12,queue=0,port=16020] regionserver.RSRpcServices: Open iw:test09,18243bd709d84eaa87a52224c2a5f584_420321800520311_20170417,1516065176992.63fbdfec70bdd534cf309fd3194685d0.
2018-01-16 10:05:55,985 INFO [PriorityRpcServer.handler=10,queue=0,port=16020] regionserver.RSRpcServices: Open iw:test09,1516065176992.adf4db74cf8fee5f59a72536bbe5c866.
2018-01-16 10:05:55,993 ERROR [RS_OPEN_REGION-dashuju172:16020-0] handler.OpenRegionHandler: Failed open of region=iw:test09,18243bd709d84eaa87a52224c2a5f584_420321800520311_20170417,1516065176992.63fbdfec70bdd534cf309fd3194685d0., starting to roll back the global memstore size.
org.apache.hadoop.hbase.DoNotRetryIOException: Compression algorithm ‘snappy’ previously failed test.
at org.apache.hadoop.hbase.util.CompressionTest.testCompression(CompressionTest.java:91)
at org.apache.hadoop.hbase.regionserver.HRegion.checkCompressionCodecs(HRegion.java:6300)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:6251)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:6218)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:6189)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:6145)
at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:6096)
at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:362)
at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:129)
at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:129)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
网上一搜，很多原因会造成这个问题，这里整理一下，虽然没有解决我遇到的问题
hbase Master节点变更
zookeeper或数据损坏
于是我按照下面的的步骤,参考shut down ZM and HBase

cp /home/hadoop/platform/zookeeper/data/myid /home/hadoop/bak/
stop-dfs.sh
stop-yarn.sh
zkServer.sh stop
stop-hbase.sh
rm -Rf /home/hadoop/platform/zookeeper/data/*
cp /home/hadoop/bak/myid /home/hadoop/platform/zookeeper/data/
start-dfs.sh
start-yarn.sh
zkServer.sh start
start-hbase.sh
zookeeper的异常不见了。
执行下面命令格式化查看zookeeper的日志

java -classpath .:/home/hadoop/application/zookeeper/lib/slf4j-api-1.6.1.jar:/home/hadoop/application/zookeeper/zookeeper-3.4.8.jar org.apache.zookeeper.server.LogFormatter /home/hadoop/platform/zookeeper/log/version-2/log.2f00000001