我在本地机器(伪分布式)上运行Hadoop MapReduce作业,该作业读取和写入HBase。我间歇性地收到一个错误,这会干扰作业,即使计算机处于独立状态而没有其他重要进程在运行 - 请参阅下面的日志。从作业后的ZooKeeper转储输出已经去世这个样子的,与客户失败后运行数增长:ConnectionLoss for/hbase +连接重置由同级?
HBase is rooted at /hbase
Master address: SS-WS-M102:60000
Region server holding ROOT: SS-WS-M102:60020
Region servers:
SS-WS-M102:60020
Quorum Server Statistics:
ss-ws-m102:2181
Zookeeper version: 3.3.3-cdh3u0--1, built on 03/26/2011 00:20 GMT
Clients:
/192.168.40.120:58484[1]\(queued=0,recved=39199,sent=39203)
/192.168.40.120:37129[1]\(queued=0,recved=162,sent=162)
/192.168.40.120:58485[1]\(queued=0,recved=39282,sent=39316)
/192.168.40.120:58488[1]\(queued=0,recved=39224,sent=39226)
/192.168.40.120:58030[0]\(queued=0,recved=1,sent=0)
/192.168.40.120:58486[1]\(queued=0,recved=39248,sent=39267)
我的开发团队当前正在使用的CDH3U0分布,所以HBase的0.90.1 - 这是一个问题在更新的版本中解决?还是应该有一些我可以用目前的设置做些什么?我是否应该期望重新启动ZK并定期关闭客户端?我愿意接受任何可以让我的工作一贯完成的合理选择。
2012-06-27 13:01:07,289 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server SS-WS-M102/192.168.40.120:2181
2012-06-27 13:01:07,289 INFO org.apache.zookeeper.ClientCnxn: Socket connection established to SS-WS-M102/192.168.40.120:2181, initiating session
2012-06-27 13:01:07,290 WARN org.apache.zookeeper.ClientCnxn: Session 0x0 for server SS-WS-M102/192.168.40.120:2181, unexpected error, closing socket connection and attempting reconnect
java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcher.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:21)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:202)
at sun.nio.ch.IOUtil.read(IOUtil.java:169)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:243)
at org.apache.zookeeper.ClientCnxn$SendThread.doIO(ClientCnxn.java:858)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1130)
[lines above repeat 6 more times]
2012-06-27 13:01:17,890 ERROR org.apache.hadoop.hbase.mapreduce.TableInputFormat: org.apache.hadoop.hbase.ZooKeeperConnectionException: org.apache.hadoop.hbase.ZooKeeperConnectionException: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hbase
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getZooKeeperWatcher(HConnectionManager.java:991)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.setupZookeeperTrackers(HConnectionManager.java:302)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.<init>(HConnectionManager.java:293)
at org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnectionManager.java:156)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:167)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:145)
at org.apache.hadoop.hbase.mapreduce.TableInputFormat.setConf(TableInputFormat.java:91)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:62)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:605)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:322)
at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115)
at org.apache.hadoop.mapred.Child.main(Child.java:262)
Caused by: org.apache.hadoop.hbase.ZooKeeperConnectionException: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hbase
at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:147)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getZooKeeperWatcher(HConnectionManager.java:989)
... 15 more
Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /hbase
at org.apache.zookeeper.KeeperException.create(KeeperException.java:90)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:637)
at org.apache.hadoop.hbase.zookeeper.ZKUtil.createAndFailSilent(ZKUtil.java:902)
at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:133)
... 16 more
我见过的连接丢失时后出现给定机器的IO太多了。你可能会咬掉你的机器上的hbase/zookeeper/hadoop M/R和其他东西。你有神经节安装吗?它可能会显示您使用了多少处理程序,以及是否正在打IO墙或抖动。 – Mike
初始描述的一项修正:在作业失败后,客户端连接的数量并未永久增加。根据HBase Jira上描述的错误,如果作业成功完成,我可能会看到这种情况。 – Cyranix
@Mike我并不是真的在同一时间运行任何其他重要结果的过程,但这是一个聪明的想法,可以监视系统资源。幸运的是,我的机器似乎足够完成手头的任务。 – Cyranix