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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-471) IllegalStateException thrown in client after region was split and deleted
Date Tue, 26 Feb 2008 00:35:51 GMT
IllegalStateException thrown in client after region was split and deleted
-------------------------------------------------------------------------

                 Key: HBASE-471
                 URL: https://issues.apache.org/jira/browse/HBASE-471
             Project: Hadoop HBase
          Issue Type: Bug
    Affects Versions: 0.1.0
         Environment: Linux Debian, HBase 0.16.0
            Reporter: Lars George


For some reason a client sometimes fails to locate a row with a IllegalStateException when
the region was split and deleted. 

> [2008-02-25 16:12:39,171] ERROR [http-80-Processor20] archive.MultilingualArchive - getDocument:
An error occurred.
> java.lang.IllegalStateException: region offline: pdc-docs,US7039976_20060509,1203981958556
>         at org.apache.hadoop.hbase.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:432)
>         at org.apache.hadoop.hbase.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:343)
>         at org.apache.hadoop.hbase.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:306)
>         at org.apache.hadoop.hbase.HTable.getRegionLocation(HTable.java:102)
>         at org.apache.hadoop.hbase.HTable.get(HTable.java:280)

Tracing the region on the master shows this:

> 2008-02-25 16:09:38,761 DEBUG org.apache.hadoop.hbase.HMaster: Received MSG_REGION_SPLIT
:
+pdc-docs,US7039976_20060509,1203981958556 from 192.168.105.21:60020
> 2008-02-25 16:09:38,761 INFO org.apache.hadoop.hbase.HMaster: region pdc-docs,US7039976_20060509,1203981958556
split. New regions
+are: pdc-docs,US7039976_20060509,1203984578345, pdc-docs,US7046359_20060516,1203984578345
> 2008-02-25 16:10:02,470 DEBUG org.apache.hadoop.hbase.HMaster: HMaster.metaScanner regioninfo:
{regionname:
+pdc-docs,US7039976_20060509,1203981958556, startKey: <US7039976_20060509>, endKey:
<US7053021_20060530>, encodedName: 1260314009,
+offline: true, split: true, tableDesc: {name: pdc-docs, families: {contents:={name: contents,
max versions: 3, compression: NONE, in
+memory: false, max length: 2147483647, bloom filter: none}, language:={name: language, max
versions: 3, compression: NONE, in
+memory: false, max length: 2147483647, bloom filter: none}, mimetype:={name: mimetype, max
versions: 3, compression: NONE, in
+memory: false, max length: 2147483647, bloom filter: none}}}}, server: 192.168.105.21:60020,
startCode: 1203949130468
> 2008-02-25 16:10:02,513 DEBUG org.apache.hadoop.hbase.HMaster: pdc-docs,US7039976_20060509,1203984578345
no longer has references
+to pdc-docs,US7039976_20060509,1203981958556
> 2008-02-25 16:10:02,516 DEBUG org.apache.hadoop.hbase.HMaster: pdc-docs,US7046359_20060516,1203984578345
no longer has references
+to pdc-docs,US7039976_20060509,1203981958556
> 2008-02-25 16:10:02,516 INFO org.apache.hadoop.hbase.HMaster: Deleting region pdc-docs,US7039976_20060509,1203981958556
because
+daughter splits no longer hold references

After discussion with st^ack it seems that the server is simply not retrying IllegalStateException
but IOExceptions only. Also see HBASE-452 which should be addressed at the same time.

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