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https://issues.apache.org/jira/browse/HADOOP-2445?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bryan Duxbury updated HADOOP-2445:
----------------------------------

    Priority: Major  (was: Minor)

Since there's data loss potential here, this seems like it should be higher 
priority.

> [hbase] NPE on failed open of region
> ------------------------------------
>
>                 Key: HADOOP-2445
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2445
>             Project: Hadoop
>          Issue Type: Bug
>            Reporter: stack
>
> From Bryan Duxbury supplied log:
> {code}
>    1044 2007-12-15 04:37:56,052 INFO org.apache.hadoop.hbase.HRegionServer: 
> MSG_REGION_OPEN : spider_pages,7_202623541,1197662034823
>    1045 2007-12-15 04:37:56,060 ERROR org.apache.hadoop.hbase.HRegionServer: 
> error opening region spider_pages,7_202623541,1197662034823
>    1046 java.io.EOFException
>    1047     at java.io.DataInputStream.readByte(DataInputStream.java:250)
>    1048     at 
> org.apache.hadoop.hbase.HStoreFile.loadInfo(HStoreFile.java:594)
>    1049     at org.apache.hadoop.hbase.HStore.<init>(HStore.java:613)
>    1050     at org.apache.hadoop.hbase.HRegion.<init>(HRegion.java:287)
>    1051     at 
> org.apache.hadoop.hbase.HRegionServer.openRegion(HRegionServer.java:1182)
>    1052     at 
> org.apache.hadoop.hbase.HRegionServer$Worker.run(HRegionServer.java:1133)
>    1053     at java.lang.Thread.run(Thread.java:619)
>    1054 2007-12-15 04:37:56,061 FATAL org.apache.hadoop.hbase.HRegionServer: 
> Unhandled exception                                                           
>                                                                               
>                                                                               
>         1055 java.lang.NullPointerException
>    1056     at 
> org.apache.hadoop.hbase.HRegionServer.reportClose(HRegionServer.java:1066)
>    1057     at 
> org.apache.hadoop.hbase.HRegionServer.openRegion(HRegionServer.java:1188)
>    1058     at 
> org.apache.hadoop.hbase.HRegionServer$Worker.run(HRegionServer.java:1133)
>    1059     at java.lang.Thread.run(Thread.java:619)
>    1060 2007-12-15 04:37:56,061 INFO org.apache.hadoop.hbase.HRegionServer: 
> worker thread exiting
> {code}
> I see same exception when we try to deploy same region on another server; the 
> info file must be horked (Seems like something we could recover from reading 
> through looking for highest sequence number; would be expensive but 
> alternative is lost region).

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