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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4238) CatalogJanitor can clear a daughter that split before processing its parent
Date Mon, 22 Aug 2011 22:36:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089099#comment-13089099
] 

Jean-Daniel Cryans commented on HBASE-4238:
-------------------------------------------

Log of the issue (daughter region being d06b3b8c85af53ccbe139df7f0877e51):

{quote}
2011-08-22 15:06:50,227 INFO org.apache.hadoop.hbase.catalog.MetaEditor: Deleted daughter
reference TestTable,,1314050587746.7ada9de242de30a4e91f00a8dfcbf693., qualifier=splitA, from
parent TestTable,,1314050584480.d06b3b8c85af53ccbe139df7f0877e51.
2011-08-22 15:06:50,229 INFO org.apache.hadoop.hbase.catalog.MetaEditor: Deleted daughter
reference TestTable,0000013824,1314050587746.66c3c9f067203cfb7c0a541e9207766d., qualifier=splitB,
from parent TestTable,,1314050584480.d06b3b8c85af53ccbe139df7f0877e51.
2011-08-22 15:06:50,230 DEBUG org.apache.hadoop.hbase.master.CatalogJanitor: Deleting region
TestTable,,1314050584480.d06b3b8c85af53ccbe139df7f0877e51. because daughter splits no longer
hold references
2011-08-22 15:06:50,230 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: DELETING region
file:/tmp/hbase-jdcryans/hbase/TestTable/d06b3b8c85af53ccbe139df7f0877e51
2011-08-22 15:06:50,234 INFO org.apache.hadoop.hbase.catalog.MetaEditor: Deleted region TestTable,,1314050584480.d06b3b8c85af53ccbe139df7f0877e51.
from META
2011-08-22 15:06:50,235 WARN org.apache.hadoop.hbase.master.CatalogJanitor: Daughter regiondir
does not exist: file:/tmp/hbase-jdcryans/hbase/TestTable/d06b3b8c85af53ccbe139df7f0877e51
2011-08-22 15:11:50,220 WARN org.apache.hadoop.hbase.master.CatalogJanitor: Daughter regiondir
does not exist: file:/tmp/hbase-jdcryans/hbase/TestTable/d06b3b8c85af53ccbe139df7f0877e51
2011-08-22 15:16:50,224 WARN org.apache.hadoop.hbase.master.CatalogJanitor: Daughter regiondir
does not exist: file:/tmp/hbase-jdcryans/hbase/TestTable/d06b3b8c85af53ccbe139df7f0877e51
...
{quote}

Those last lines will happen forever, and .META. will be littered with that row.

> CatalogJanitor can clear a daughter that split before processing its parent
> ---------------------------------------------------------------------------
>
>                 Key: HBASE-4238
>                 URL: https://issues.apache.org/jira/browse/HBASE-4238
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.4
>            Reporter: Jean-Daniel Cryans
>            Priority: Critical
>             Fix For: 0.90.5
>
>
> I didn't dig a lot into this issue, but by splitting a table twice in a row I was able
to trigger a situation where a daughter of the first split was deleted by the CatalogJanitor
before it processed its parent. Will post log in a comment.

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