You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@hbase.apache.org by "Enis Soztutar (JIRA)" <ji...@apache.org> on 2013/05/08 05:31:17 UTC
[jira] [Updated] (HBASE-8505) References to split daughters should
not be deleted separately from parent META entry
[ https://issues.apache.org/jira/browse/HBASE-8505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Enis Soztutar updated HBASE-8505:
---------------------------------
Attachment: hbase-8505_v1-0.94.patch
Attaching a patch for 0.94.
It fixes three related issues:
- Removes first Delete just to delete the columns from parent.
- Changes CatalogJanitor to use BlockingMetaScannerVisitor instead of MetaReader.Visitor.
- Fixes CatalogJanitor.SplitParentFirstComparator so that it sorts the root region (region with empty start, end keys) to be sorted correctly.
Trunk patch coming up.
> 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
>
>
> 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.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira