hbase遇到问题及解决方法

1.zookeeper启动报错

错误日志

启动zookeeper报错信息如下：

java.net.NoRouteToHostException: No route to host
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:579)
        at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368)
        at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402)
        at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840)
        at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762)
2015-05-19 10:26:26,983 [myid:1] - INFO  [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@849] - Notification time out: 800

解决方法

此问题产生的主要原因是因为zookeeper集群未关闭防火墙。
执行下面命令后仍然报上面的错误：
systemctl start iptables.service
经过仔细查找后发现，CentOS 7.0默认使用的是firewall作为防火墙，需要执行如下命令关闭防火墙:
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
关闭各个节点防火墙后，重启zookeeper进程，就可以解决上述问题了。

2.RegionServer进程挂掉

错误日志

Caused by: java.io.IOException: Couldn‘t set up IO streams
    at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:786)
    at org.apache.hadoop.ipc.Client$Connection.access$2800(Client.java:368)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:1521)
    at org.apache.hadoop.ipc.Client.call(Client.java:1438)
    ... 60 more
Caused by: java.lang.OutOfMemoryError: unable to create new native thread
    at java.lang.Thread.start0(Native Method)
    at java.lang.Thread.start(Thread.java:713)
    at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:779)

解决方法

/etc/security/limits.conf

/etc/security/limits.d/90-nproc.conf

*       hard    nproc   65536
*       soft    nproc   65536
*       hard    nofile  65536
*       soft    nofile  65536