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Date: Mon, 22 Oct 2012 02:10:12 +0000 (UTC)
From: "liang xie (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-6998) Uncaught exception in main() makes
 the HMaster/HRegionServer process suspend
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    [ https://issues.apache.org/jira/browse/HBASE-6998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13481125#comment-13481125 ] 

liang xie commented on HBASE-6998:
----------------------------------

Could anyone have a review on this issue?  Thanks:)
                
> Uncaught exception in main() makes the HMaster/HRegionServer process suspend
> ----------------------------------------------------------------------------
>
>                 Key: HBASE-6998
>                 URL: https://issues.apache.org/jira/browse/HBASE-6998
>             Project: HBase
>          Issue Type: Bug
>          Components: master, regionserver
>    Affects Versions: 0.94.2, 0.96.0
>         Environment: CentOS6.2 + CDH4.1 HDFS  + hbase0.94.2
>            Reporter: liang xie
>            Assignee: liang xie
>         Attachments: HBASE-6998.patch
>
>
> I am trying HDFS QJM feature in our test env. after a misconfig, i found the HMaster/HRegionServer process still up if the main thread is dead. Here is the stack trace:
> xception in thread "main" java.net.UnknownHostException: unknown host: cluster1
>         at org.apache.hadoop.ipc.Client$Connection.<init>(Client.java:214)
>         at org.apache.hadoop.ipc.Client.getConnection(Client.java:1196)
>         at org.apache.hadoop.ipc.Client.call(Client.java:1050)
>         at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)
>         at $Proxy8.getProtocolVersion(Unknown Source)
>         at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:396)
>         at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:379)
>         at org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:119)
>         at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:238)
>         at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:203)
>         at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:89)
>         at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1386)
>         at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66)
>         at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1404)
>         at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:254)
>         at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:123)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.startRegionServer(HRegionServer.java:3647)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.startRegionServer(HRegionServer.java:3631)
>         at org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.start(HRegionServerCommandLine.java:61)
>         at org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.run(HRegionServerCommandLine.java:75)
>         at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
>         at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:76)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.main(HRegionServer.java:3691)
> Then i need to kill the process manually to cleanup each time, so annoyed.
> After applied the attached patch, the process will exist as expected, then i am happy again :)

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