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https://issues.apache.org/jira/browse/HBASE-9593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13773200#comment-13773200
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Himanshu Vashishtha commented on HBASE-9593:
--------------------------------------------
We would loose that check to see what name master has registered for a
regionserver, and instead just use isa.getName for creating znode.
> Region server left in online servers list forever if it went down after
> registering to master and before creating ephemeral node
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-9593
> URL: https://issues.apache.org/jira/browse/HBASE-9593
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.94.11
> Reporter: rajeshbabu
> Assignee: rajeshbabu
> Fix For: 0.98.0, 0.94.13, 0.96.1
>
> Attachments: HBASE-9593.patch
>
>
> In some of our tests we found that regionserer always showing online in
> master UI but its actually dead.
> If region server went down in the middle following steps then the region
> server always showing in master online servers list.
> 1) register to master
> 2) create ephemeral znode
> Since no notification from zookeeper, master is not removing the expired
> server from online servers list.
> Assignments will fail if the RS is selected as destination server.
> Some cases ROOT or META also wont be assigned if the RS is randomly selected
> every time need to wait for timeout.
> Here are the logs:
> 1) HOST-10-18-40-153 is registered to master
> {code}
> 2013-09-19 19:47:41,123 DEBUG org.apache.hadoop.hbase.master.ServerManager:
> STARTUP: Server HOST-10-18-40-153,61020,1379600260255 came back up, removed
> it from the dead servers list
> 2013-09-19 19:47:41,123 INFO org.apache.hadoop.hbase.master.ServerManager:
> Registering server=HOST-10-18-40-153,61020,1379600260255
> {code}
> {code}
> 2013-09-19 19:47:41,119 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer: Connected to master at
> HOST-10-18-40-153/10.18.40.153:61000
> 2013-09-19 19:47:41,119 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer: Telling master at
> HOST-10-18-40-153,61000,1379600055284 that we are up with port=61020,
> startcode=1379600260255
> {code}
> 2) Terminated before creating ephemeral node.
> {code}
> Thu Sep 19 19:47:41 IST 2013 Terminating regionserver
> {code}
> 3) The RS can be selected for assignment and they will fail.
> {code}
> 2013-09-19 19:47:54,049 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Failed assignment of
> -ROOT-,,0.70236052 to HOST-10-18-40-153,61020,1379600260255, trying to assign
> elsewhere instead; retry=0
> java.net.ConnectException: Connection refused
> at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
> at
> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
> at
> org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
> at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:529)
> at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:493)
> at
> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupConnection(HBaseClient.java:390)
> at
> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupIOstreams(HBaseClient.java:436)
> at
> org.apache.hadoop.hbase.ipc.HBaseClient.getConnection(HBaseClient.java:1127)
> at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:974)
> at
> org.apache.hadoop.hbase.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:86)
> at $Proxy15.openRegion(Unknown Source)
> at
> org.apache.hadoop.hbase.master.ServerManager.sendRegionOpen(ServerManager.java:533)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1734)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1431)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1406)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1401)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assignRoot(AssignmentManager.java:2374)
> at
> org.apache.hadoop.hbase.master.handler.MetaServerShutdownHandler.verifyAndAssignRoot(MetaServerShutdownHandler.java:136)
> at
> org.apache.hadoop.hbase.master.handler.MetaServerShutdownHandler.verifyAndAssignRootWithRetries(MetaServerShutdownHandler.java:160)
> at
> org.apache.hadoop.hbase.master.handler.MetaServerShutdownHandler.process(MetaServerShutdownHandler.java:82)
> at
> org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:175)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> 2013-09-19 19:47:54,050 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Found an existing plan for
> -ROOT-,,0.70236052 destination server is HOST-10-18-40-153,61020,1379600260255
> 2013-09-19 19:47:54,050 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: No previous transition plan
> was found (or we are ignoring an existing plan) for -ROOT-,,0.70236052 so
> generated a random one; hri=-ROOT-,,0.70236052, src=,
> dest=HOST-10-18-40-153,61020,1379600260255; 1 (online=1, available=1)
> available servers
> 2013-09-19 19:47:54,050 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign:
> master:61000-0x14135a277ff017d Creating (or updating) unassigned node for
> 70236052 with OFFLINE state
> 2013-09-19 19:47:54,070 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Handling
> transition=M_ZK_REGION_OFFLINE, server=HOST-10-18-40-153,61000,1379600055284,
> region=70236052/-ROOT-
> 2013-09-19 19:47:54,071 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Found an existing plan for
> -ROOT-,,0.70236052 destination server is HOST-10-18-40-153,61020,1379600260255
> 2013-09-19 19:47:54,071 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Using pre-existing plan for
> region -ROOT-,,0.70236052; plan=hri=-ROOT-,,0.70236052, src=,
> dest=HOST-10-18-40-153,61020,1379600260255
> 2013-09-19 19:47:54,071 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Assigning region
> -ROOT-,,0.70236052 to HOST-10-18-40-153,61020,1379600260255
> 2013-09-19 19:47:54,072 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Failed assignment of
> -ROOT-,,0.70236052 to HOST-10-18-40-153,61020,1379600260255, trying to assign
> elsewhere instead; retry=1
> org.apache.hadoop.hbase.ipc.HBaseClient$FailedServerException: This server is
> in the failed servers list: HOST-10-18-40-153/10.18.40.153:61020
> at
> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupIOstreams(HBaseClient.java:425)
> at
> org.apache.hadoop.hbase.ipc.HBaseClient.getConnection(HBaseClient.java:1127)
> at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:974)
> at
> org.apache.hadoop.hbase.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:86)
> at $Proxy15.openRegion(Unknown Source)
> at
> org.apache.hadoop.hbase.master.ServerManager.sendRegionOpen(ServerManager.java:533)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1734)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1431)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1406)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1401)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.assignRoot(AssignmentManager.java:2374)
> at
> org.apache.hadoop.hbase.master.handler.MetaServerShutdownHandler.verifyAndAssignRoot(MetaServerShutdownHandler.java:136)
> at
> org.apache.hadoop.hbase.master.handler.MetaServerShutdownHandler.verifyAndAssignRootWithRetries(MetaServerShutdownHandler.java:160)
> at
> org.apache.hadoop.hbase.master.handler.MetaServerShutdownHandler.process(MetaServerShutdownHandler.java:82)
> at
> org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:175)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> 2013-09-19 19:47:54,072 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Found an existing plan for
> -ROOT-,,0.70236052 destination server is HOST-10-18-40-153,61020,1379600260255
> {code}
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