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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8505) References to split daughters should not be deleted separately from parent META entry
Date Fri, 17 May 2013 02:03:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660260#comment-13660260
] 

Hudson commented on HBASE-8505:
-------------------------------

Integrated in hbase-0.95-on-hadoop2 #102 (See [https://builds.apache.org/job/hbase-0.95-on-hadoop2/102/])
    HBASE-8505 References to split daughters should not be deleted separately from parent
META entry (Revision 1483483)

     Result = FAILURE
enis : 
Files : 
* /hbase/branches/0.95/hbase-client/src/main/java/org/apache/hadoop/hbase/client/MetaScanner.java
* /hbase/branches/0.95/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Bytes.java
* /hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/catalog/MetaEditor.java
* /hbase/branches/0.95/hbase-server/src/main/java/org/apache/hadoop/hbase/master/CatalogJanitor.java
* /hbase/branches/0.95/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestMetaScanner.java
* /hbase/branches/0.95/hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestCatalogJanitor.java

                
> 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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