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https://issues.apache.org/jira/browse/HBASE-2244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12836428#action_12836428
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Jean-Daniel Cryans commented on HBASE-2244:
-------------------------------------------
bq. It would still be good to understand why parent row deletion takes time and
fix any known inconsistencies in this area.
It's by design, we only clear the parent when the daughters no longer have
references since we don't split the HFiles during the split process but after
during compactions.
> META gets inconsistent in a number of crash scenarios
> -----------------------------------------------------
>
> Key: HBASE-2244
> URL: https://issues.apache.org/jira/browse/HBASE-2244
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: Kannan Muthukkaruppan
> Assignee: stack
> Priority: Critical
> Fix For: 0.20.4
>
>
> (Forking this issue off from HBASE-2235).
> During load testing, in a number of failure scenarios (unexpected region
> server deaths) etc., we notice that META can get inconsistent. This primarily
> happens for regions which are in the process of being split. Manually running
> add_table.rb seems to fix the tables meta data just fine.
> But it would be good to do automatic cleansing (as part of META scanners
> work) and/or avoid these inconsistent states altogether.
> For example, for a particular startkey, I see all these entries:
> {code}
> test1,1204765,1266569946560 column=info:regioninfo, timestamp=1266581302018,
> value=REGION => {NAME => 'test1,
> 1204765,1266569946560', STARTKEY => '1204765',
> ENDKEY => '1441091', ENCODED => 18
> 19368969, OFFLINE => true, SPLIT => true, TABLE
> => {{NAME => 'test1', FAMILIES =>
> [{NAME => 'actions', VERSIONS => '3',
> COMPRESSION => 'NONE', TTL => '2147483647'
> , BLOCKSIZE => '65536', IN_MEMORY => 'false',
> BLOCKCACHE => 'true'}]}}
> test1,1204765,1266569946560 column=info:server, timestamp=1266570029133,
> value=10.129.68.212:60020
> test1,1204765,1266569946560 column=info:serverstartcode,
> timestamp=1266570029133, value=1266562597546
> test1,1204765,1266569946560 column=info:splitB, timestamp=1266581302018,
> value=\x00\x071441091\x00\x00\x00\x0
>
> 1\x26\xE6\x1F\xDF\x27\x1Btest1,1290703,1266581233447\x00\x071290703\x00\x00\x00\x
>
> 05\x05test1\x00\x00\x00\x00\x00\x02\x00\x00\x00\x07IS_ROOT\x00\x00\x00\x05false\x
>
> 00\x00\x00\x07IS_META\x00\x00\x00\x05false\x00\x00\x00\x01\x07\x07actions\x00\x00
>
> \x00\x07\x00\x00\x00\x0BBLOOMFILTER\x00\x00\x00\x05false\x00\x00\x00\x0BCOMPRESSI
>
> ON\x00\x00\x00\x04NONE\x00\x00\x00\x08VERSIONS\x00\x00\x00\x013\x00\x00\x00\x03TT
>
> L\x00\x00\x00\x0A2147483647\x00\x00\x00\x09BLOCKSIZE\x00\x00\x00\x0565536\x00\x00
>
> \x00\x09IN_MEMORY\x00\x00\x00\x05false\x00\x00\x00\x0ABLOCKCACHE\x00\x00\x00\x04t
> rueh\x0FQ\xCF
> test1,1204765,1266581233447 column=info:regioninfo, timestamp=1266609172177,
> value=REGION => {NAME => 'test1,
> 1204765,1266581233447', STARTKEY => '1204765',
> ENDKEY => '1290703', ENCODED => 13
> 73493090, OFFLINE => true, SPLIT => true, TABLE
> => {{NAME => 'test1', FAMILIES =>
> [{NAME => 'actions', VERSIONS => '3',
> COMPRESSION => 'NONE', TTL => '2147483647'
> , BLOCKSIZE => '65536', IN_MEMORY => 'false',
> BLOCKCACHE => 'true'}]}}
> test1,1204765,1266581233447 column=info:server, timestamp=1266604768670,
> value=10.129.68.213:60020
> test1,1204765,1266581233447 column=info:serverstartcode,
> timestamp=1266604768670, value=1266562597511
> test1,1204765,1266581233447 column=info:splitA, timestamp=1266609172177,
> value=\x00\x071226169\x00\x00\x00\x0
>
> 1\x26\xE7\xCA,\x7D\x1Btest1,1204765,1266609171581\x00\x071204765\x00\x00\x00\x05\
>
> x05test1\x00\x00\x00\x00\x00\x02\x00\x00\x00\x07IS_ROOT\x00\x00\x00\x05false\x00\
>
> x00\x00\x07IS_META\x00\x00\x00\x05false\x00\x00\x00\x01\x07\x07actions\x00\x00\x0
>
> 0\x07\x00\x00\x00\x0BBLOOMFILTER\x00\x00\x00\x05false\x00\x00\x00\x0BCOMPRESSION\
>
> x00\x00\x00\x04NONE\x00\x00\x00\x08VERSIONS\x00\x00\x00\x013\x00\x00\x00\x03TTL\x
>
> 00\x00\x00\x0A2147483647\x00\x00\x00\x09BLOCKSIZE\x00\x00\x00\x0565536\x00\x00\x0
>
> 0\x09IN_MEMORY\x00\x00\x00\x05false\x00\x00\x00\x0ABLOCKCACHE\x00\x00\x00\x04true
> \xB9\xBD\xFEO
> test1,1204765,1266581233447 column=info:splitB, timestamp=1266609172177,
> value=\x00\x071290703\x00\x00\x00\x0
>
> 1\x26\xE7\xCA,\x7D\x1Btest1,1226169,1266609171581\x00\x071226169\x00\x00\x00\x05\
>
> x05test1\x00\x00\x00\x00\x00\x02\x00\x00\x00\x07IS_ROOT\x00\x00\x00\x05false\x00\
>
> x00\x00\x07IS_META\x00\x00\x00\x05false\x00\x00\x00\x01\x07\x07actions\x00\x00\x0
>
> 0\x07\x00\x00\x00\x0BBLOOMFILTER\x00\x00\x00\x05false\x00\x00\x00\x0BCOMPRESSION\
>
> x00\x00\x00\x04NONE\x00\x00\x00\x08VERSIONS\x00\x00\x00\x013\x00\x00\x00\x03TTL\x
>
> 00\x00\x00\x0A2147483647\x00\x00\x00\x09BLOCKSIZE\x00\x00\x00\x0565536\x00\x00\x0
>
> 0\x09IN_MEMORY\x00\x00\x00\x05false\x00\x00\x00\x0ABLOCKCACHE\x00\x00\x00\x04true
> \xE1\xDF\xF8p
> test1,1204765,1266609171581 column=info:regioninfo, timestamp=1266609172212,
> value=REGION => {NAME => 'test1,
> 1204765,1266609171581', STARTKEY => '1204765',
> ENDKEY => '1226169', ENCODED => 21
> 34878372, TABLE => {{NAME => 'test1', FAMILIES
> => [{NAME => 'actions', VERSIONS =
> > '3', COMPRESSION => 'NONE', TTL =>
> '2147483647', BLOCKSIZE => '65536', IN_MEMOR
> Y => 'false', BLOCKCACHE => 'true'}]}}
> {code}
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