1.
HBase异常：java.io.IOException: Connection reset by peer
org.apache.hadoop.ipc.HBaseServer: IPC Server listener on 60000: readAndProcess threw exception java.io.IOException: Connection reset by peer. Count of bytes read: 0
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:198)
at sun.nio.ch.IOUtil.read(IOUtil.java:171)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:243)
at org.apache.hadoop.hbase.ipc.HBaseServer.channelIO(HBaseServer.java:1389)
at org.apache.hadoop.hbase.ipc.HBaseServer.channelRead(HBaseServer.java:1359)
at org.apache.hadoop.hbase.ipc.HBaseServer$Connection.readAndProcess(HBaseServer.java:940)
at org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:522)
at org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:316)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
hbase客户端每次和regionserver交互的时候，都会在服务器端生成一个租约（Lease),租约的有效期由参数hbase.regionserver.lease.period确定。
当客户端去regionserver取数据的时候，而此时hbase中存得数据量很大并且很多region时，客户端请求的region不在内存中，或是没有被cache命中，就需要从磁盘中加载，如果这时候加载需要的时间超过hbase.regionserver.lease.period所配置的时间，并且客户端没有和 regionserver报告其还活着，那么regionserver就会认为本次租约已经过期，并从LeaseQueue从删除掉本次租约，当regionserver加载完成后，拿已经被删除的租约再去取数据的时候，就会出现如上的错误现象。
解决的办法：
1、适当的增大 hbase.regionserver.lease.period参数的值，默认是1分钟
2、增大regionserver的cache大小
2.
zookeeper服务器未设置或者/etc/hosts设置有误（hbase）
2013-03-11 19:41:08,263 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
2013-03-11 19:41:08,266 WARN org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: 拒绝连接
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:692)
at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1068)
1. HBase异常：java.io.IOException: Connection reset by peer
org.apache.hadoop.ipc.HBaseServer: IPC Server listener on 60000: readAndProcess threw exception java.io.IOException: Connection reset by peer. Count of bytes read: 0 java.io.IOException: Connection reset by peer at sun.nio.ch.FileDispatcher.read0(Native Method) at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:21) at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:198) at sun.nio.ch.IOUtil.read(IOUtil.java:171) at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:243) at org.apache.hadoop.hbase.ipc.HBaseServer.channelIO(HBaseServer.java:1389) at org.apache.hadoop.hbase.ipc.HBaseServer.channelRead(HBaseServer.java:1359) at org.apache.hadoop.hbase.ipc.HBaseServer$Connection.readAndProcess(HBaseServer.java:940) at org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:522) at org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:316) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) hbase客户端每次和regionserver交互的时候，都会在服务器端生成一个租约（Lease),租约的有效期由参数hbase.regionserver.lease.period确定。 当客户端去regionserver取数据的时候，而此时hbase中存得数据量很大并且很多region时，客户端请求的region不在内存中，或是没有被cache命中，就需要从磁盘中加载，如果这时候加载需要的时间超过hbase.regionserver.lease.period所配置的时间，并且客户端没有和 regionserver报告其还活着，那么regionserver就会认为本次租约已经过期，并从LeaseQueue从删除掉本次租约，当regionserver加载完成后，拿已经被删除的租约再去取数据的时候，就会出现如上的错误现象。 解决的办法： 1、适当的增大 hbase.regionserver.lease.period参数的值，默认是1分钟 2、增大regionserver的cache大小
2. zookeeper服务器未设置或者/etc/hosts设置有误（hbase）
2013-03-11 19:41:08,263 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error) 2013-03-11 19:41:08,266 WARN org.apache.zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect java.net.ConnectException: 拒绝连接 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:692) at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350) at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1068)