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From "shanmuganathan.r" <shanmuganatha...@zohocorp.com>
Subject Backup Master not started?
Date Tue, 02 Aug 2011 11:12:14 GMT
Hi All,

      I have the problem in my HBase fully distributed mode with backup master . The HBase
in the fully distributed mode is starting and working properly. The Active Master is working
and My backup master is waiting for the active master termination. If I kill the active master
process, the backup master don't come to active which remains in the waiting state. 


      I declared the backup master in the HBase/conf/Backup-masters file.


      My backup master log is 
2011-08-02 16:04:16,416 INFO org.apache.hadoop.hbase.metrics: MetricsString added: revision
2011-08-02 16:04:16,416 INFO org.apache.hadoop.hbase.metrics: MetricsString added: hdfsUser
2011-08-02 16:04:16,416 INFO org.apache.hadoop.hbase.metrics: MetricsString added: hdfsDate
2011-08-02 16:04:16,416 INFO org.apache.hadoop.hbase.metrics: MetricsString added: hdfsUrl
2011-08-02 16:04:16,416 INFO org.apache.hadoop.hbase.metrics: MetricsString added: date
2011-08-02 16:04:16,416 INFO org.apache.hadoop.hbase.metrics: MetricsString added: hdfsRevision
2011-08-02 16:04:16,416 INFO org.apache.hadoop.hbase.metrics: MetricsString added: user
2011-08-02 16:04:16,416 INFO org.apache.hadoop.hbase.metrics: MetricsString added: hdfsVersion
2011-08-02 16:04:16,416 INFO org.apache.hadoop.hbase.metrics: MetricsString added: url
2011-08-02 16:04:16,416 INFO org.apache.hadoop.hbase.metrics: MetricsString added: version
2011-08-02 16:04:16,416 INFO org.apache.hadoop.hbase.metrics: new MBeanInfo
2011-08-02 16:04:16,417 INFO org.apache.hadoop.hbase.metrics: new MBeanInfo
2011-08-02 16:04:16,417 INFO org.apache.hadoop.hbase.master.metrics.MasterMetrics: Initialized
2011-08-02 16:04:16,418 DEBUG org.apache.hadoop.hbase.master.HMaster: HMaster started in backup
mode.  Stalling until master znode is written.
2011-08-02 16:04:16,418 DEBUG org.apache.hadoop.hbase.master.HMaster: Waiting for master address
ZNode to be written (Also watching cluster state node)
2011-08-02 16:07:16,418 DEBUG org.apache.hadoop.hbase.master.HMaster: Waiting for master address
ZNode to be written (Also watching cluster state node)
2011-08-02 16:10:16,418 DEBUG org.apache.hadoop.hbase.master.HMaster: Waiting for master address
ZNode to be written (Also watching cluster state node)
2011-08-02 16:13:16,418 DEBUG org.apache.hadoop.hbase.master.HMaster: Waiting for master address
ZNode to be written (Also watching cluster state node)


--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


      And the one of my region server log is


2011-08-02 16:21:45,977 DEBUG org.apache.hadoop.hbase.io.hfile.LruBlockCache: LRU Stats: total=958.41
KB, free=198.43 MB, max=199.36 MB, blocks=1, accesses=10, hits=9, hitRatio=89.99%%, cachingAccesses=10,
cachingHits=9, cachingHitsRatio=89.99%%, evictions=0, evicted=0, evictedPerRun=NaN
2011-08-02 16:22:40,714 WARN org.apache.hadoop.hbase.regionserver.HRegionServer: Unable to
connect to master. Retrying. Error was:
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:592)
        at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
        at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:404)
        at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupIOstreams(HBaseClient.java:328)
        at org.apache.hadoop.hbase.ipc.HBaseClient.getConnection(HBaseClient.java:883)
        at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:750)
        at org.apache.hadoop.hbase.ipc.HBaseRPC$Invoker.invoke(HBaseRPC.java:257)
        at $Proxy5.getProtocolVersion(Unknown Source)
        at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:419)
        at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:393)
        at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:444)
        at org.apache.hadoop.hbase.ipc.HBaseRPC.waitForProxy(HBaseRPC.java:349)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.getMaster(HRegionServer.java:1445)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.tryRegionServerReport(HRegionServer.java:737)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:586)
        at java.lang.Thread.run(Thread.java:636)



--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


1. How can we solve this problem?


2. Is there any extra configuration needed for this backup master configuration in HBase?


                                                      Thanks for your valuable suggestions
......!


Regards,

Shanmuganathan




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