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https://issues.apache.org/jira/browse/HBASE-8505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl resolved HBASE-8505.
----------------------------------
Resolution: Fixed
Thanks Andy and Enis.
> References to split daughters should not be deleted separately from parent
> META entry
> -------------------------------------------------------------------------------------
>
> Key: HBASE-8505
> URL: https://issues.apache.org/jira/browse/HBASE-8505
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Fix For: 0.98.0, 0.94.8, 0.95.1
>
> Attachments: hbase-8505_v1-0.94.patch, hbase-8505_v2-0.94.patch,
> hbase-8505_v2-0.94-reduced.patch, hbase-8505_v2.patch, hbase-8505_v2.patch
>
>
> In CatalogJanitor, we clean up the parent regions whose daughters does not
> have any more references to their parent regions. In doing so, we do two
> Delete's one for removing the split daughter columns, and the other for
> removing the row.
> The first one seems unnecessary, and causes NPE from concurrent MetaScanner.
> Stack trace:
> {code}
> 2013-05-07 04:49:40,828|machine|INFO|Exception in thread "main"
> java.lang.NullPointerException
> 2013-05-07 04:49:40,828|machine|INFO|at
> org.apache.hadoop.hbase.util.Writables.getWritable(Writables.java:103)
> 2013-05-07 04:49:40,828|machine|INFO|at
> org.apache.hadoop.hbase.util.Writables.getHRegionInfo(Writables.java:147)
> 2013-05-07 04:49:40,829|machine|INFO|at
> org.apache.hadoop.hbase.client.MetaScanner$BlockingMetaScannerVisitor.processRow(MetaScanner.java:406)
> 2013-05-07 04:49:40,829|machine|INFO|at
> org.apache.hadoop.hbase.client.MetaScanner$TableMetaScannerVisitor.processRow(MetaScanner.java:487)
> 2013-05-07 04:49:40,830|machine|INFO|at
> org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:224)
> 2013-05-07 04:49:40,830|machine|INFO|at
> org.apache.hadoop.hbase.client.MetaScanner.access$000(MetaScanner.java:54)
> 2013-05-07 04:49:40,830|machine|INFO|at
> org.apache.hadoop.hbase.client.MetaScanner$1.connect(MetaScanner.java:133)
> 2013-05-07 04:49:40,831|machine|INFO|at
> org.apache.hadoop.hbase.client.MetaScanner$1.connect(MetaScanner.java:130)
> 2013-05-07 04:49:40,831|machine|INFO|at
> org.apache.hadoop.hbase.client.HConnectionManager.execute(HConnectionManager.java:384)
> 2013-05-07 04:49:40,831|machine|INFO|at
> org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:130)
> 2013-05-07 04:49:40,832|machine|INFO|at
> org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:105)
> 2013-05-07 04:49:40,832|machine|INFO|at
> org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:83)
> 2013-05-07 04:49:40,832|machine|INFO|at
> org.apache.hadoop.hbase.client.MetaScanner.allTableRegions(MetaScanner.java:323)
> 2013-05-07 04:49:40,833|machine|INFO|at
> org.apache.hadoop.hbase.client.HTable.getRegionLocations(HTable.java:485)
> 2013-05-07 04:49:40,833|machine|INFO|at
> org.apache.hadoop.hbase.client.HTable.getStartEndKeys(HTable.java:438)
> {code}
> Master is doing the CatalogJanitor concurrently:
> {code}
> 2013-05-07 04:49:40,636 INFO org.apache.hadoop.hbase.catalog.MetaEditor:
> Deleted daughters references, qualifier=splitA and qualifier=splitB, from
> parent
> IntegrationTestBigLinkedList,\x07\xFB\x98\xB7a\x89\xF5\xE6,1367898577620.4ef1329ff0e8911db998ac8ccd32108d.
> 2013-05-07 04:49:40,666 INFO org.apache.hadoop.hbase.catalog.MetaEditor:
> Deleted region
> IntegrationTestBigLinkedList,\x07\xFB\x98\xB7a\x89\xF5\xE6,1367898577620.4ef1329ff0e8911db998ac8ccd32108d.
> from META
> 2013-05-07 04:49:40,690 INFO org.apache.hadoop.hbase.catalog.MetaEditor:
> Deleted daughters references, qualifier=splitA and qualifier=splitB, from
> parent
> IntegrationTestBigLinkedList,\x0B\xF8n\xEA\xD3\xAA\xA9\x92,1367898577620.b502376df2623cb0be3f0c1664d799a6.
> 2013-05-07 04:49:40,716 INFO org.apache.hadoop.hbase.catalog.MetaEditor:
> Deleted region
> IntegrationTestBigLinkedList,\x0B\xF8n\xEA\xD3\xAA\xA9\x92,1367898577620.b502376df2623cb0be3f0c1664d799a6.
> from META
> 2013-05-07 04:49:40,742 INFO org.apache.hadoop.hbase.catalog.MetaEditor:
> Deleted daughters references, qualifier=splitA and qualifier=splitB, from
> parent
> IntegrationTestBigLinkedList,\x17\xF5\x11\xB9\xE3\xDB)\x0C,1367898541729.ec2df58fafb823cec6e793ba35e2241d.
> {code}
> This is critical for 0.94, but not for 0.95 and trunk due to HBASE-7721.
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