hi Shanmuganathan, I am currently using ./bin/hbase-daemon.sh start master to start both active and backup master.
so once the active goes down automatically the backup becomes master and the RS will connect to it.(Hope this part is working fine). I have not used in the way that you have mentioned ./bin/hbase-daemon.sh start master --backup. So i would suggest that you can now use the same command ./bin/hbase-daemon.sh start master for both. By the time if there is any problem in ./bin/hbase-daemon.sh start master --backup we could raise a JIRA for that and fix it. Regards Ram -----Original Message----- From: shanmuganathan.r [mailto:shanmuganatha...@zohocorp.com] Sent: Tuesday, August 09, 2011 12:47 PM To: user Subject: Doubt in backup master ? Hi Ram, Now I am using the HBase 0.90.3 version. When I am using the following command for the backup master means that working properly ./bin/hbase-daemon.sh start master The log printed in my backup master is 2011-08-09 12:31:55,156 INFO org.apache.hadoop.hbase.metrics: MetricsString added: version 2011-08-09 12:31:55,156 INFO org.apache.hadoop.hbase.metrics: new MBeanInfo 2011-08-09 12:31:55,157 INFO org.apache.hadoop.hbase.metrics: new MBeanInfo 2011-08-09 12:31:55,157 INFO org.apache.hadoop.hbase.master.metrics.MasterMetrics: Initialized 2011-08-09 12:31:55,186 INFO org.apache.hadoop.hbase.master.ActiveMasterManager: Another master is the active master, rohinis.zohocorpin.com:60000; waiting to become the next active master --------------------------------------------------- If I am using ./bin/hbase-daemon.sh start master --backup The Region servers are not assigned to the backup master. The log printed in my backup master is 2011-08-09 12:19:19,041 INFO org.apache.hadoop.hbase.metrics: new MBeanInfo 2011-08-09 12:19:19,041 INFO org.apache.hadoop.hbase.master.metrics.MasterMetrics: Initialized 2011-08-09 12:19:19,041 DEBUG org.apache.hadoop.hbase.master.HMaster: HMaster started in backup mode. Stalling until master znode is written. 2011-08-09 12:19:19,041 DEBUG org.apache.hadoop.hbase.master.HMaster: Waiting for master address ZNode to be written (Also watching cluster state node) --------------------------------------------------- The log printed in my RS is 2011-08-09 12:23:03,918 DEBUG org.apache.hadoop.hbase.io.hfile.LruBlockCache: LRU Stats: total=955.33 KB, free=197.79 MB, max=198.73 MB, blocks=1, accesses=76, hits=75, hitRatio=98.68%%, cachingAccesses=76, cachingHits=75, cachingHitsRatio=98.68%%, evictions=0, evicted=0, evictedPerRun=NaN 2011-08-09 12:23:08,452 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:2 06) at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:404) at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupIOstreams(HBaseClien t.java:328) at org.apache.hadoop.hbase.ipc.HBaseClient.getConnection(HBaseClient.java:883) at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:750) at org.apache.hadoop.hbase.ipc.HBaseRPC$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.j ava:1442) at org.apache.hadoop.hbase.regionserver.HRegionServer.tryRegionServerReport(HRe gionServer.java:741) at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:59 4) at java.lang.Thread.run(Thread.java:636) 2011-08-09 12:23:11,453 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: No master found, will retry 2011-08-09 12:23:14,453 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: No master found, will retry 2011-08-09 12:23:17,453 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: No master found, will retry 2011-08-09 12:23:20,454 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: No master found, will retry 2011-08-09 12:23:23,454 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: No master found, will retry 2011-08-09 12:23:26,454 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: No master found, will retry . . . ----------------------------------------------- My doubt is Are the above two commands are same for this backup master configuration ? Can I use the First command for the Multi master configuration ? If the second one is the only command for Multi master configuration, than how can i solve this problem ? Regards, Shanmuganathan