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Date: Mon, 4 Feb 2008 12:57:08 -0800 (PST)
From: "Bryan Duxbury (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-72) [hbase] 'Normal' operation should not
 depend on throwing of exceptions (e.g. NotServingRegionException)
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    [ https://issues.apache.org/jira/browse/HBASE-72?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565522#action_12565522 ] 

Bryan Duxbury commented on HBASE-72:
------------------------------------

Can we close this issue? if there was a significant amount of desire to refactor this interaction, it'd have been done by now. 

> [hbase] 'Normal' operation should not depend on throwing of exceptions (e.g. NotServingRegionException)
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-72
>                 URL: https://issues.apache.org/jira/browse/HBASE-72
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
>            Priority: Trivial
>
> Region server and client logs will have lots of the following when a cluster is being loaded:
> {code}
> org.apache.hadoop.hbase.NotServingRegionException: hbaserepository,,7144829661993961256
>         at org.apache.hadoop.hbase.HRegionServer.getRegion(HRegionServer.java:1208)
>         at org.apache.hadoop.hbase.HRegionServer.getRegion(HRegionServer.java:1180)
>         at org.apache.hadoop.hbase.HRegionServer.startUpdate(HRegionServer.java:1122)
>         at org.apache.hadoop.hbase.HRegionServer.batchUpdate(HRegionServer.java:985)
>         at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:340)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:566)
> {code}
> The NotServingRegionException exception is thrown when the remote server is no longer serving the asked-for region (usually because its been split).  The server throws the exception to provoke the client into making a new interrogation of region locations.
> It would be an improvement if such 'normal' operation was not built atop exceptions.  For example, commits might return a 'region moved' message.

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