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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2244) META gets inconsistent in a number of crash scenarios
Date Mon, 22 Feb 2010 20:52:29 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2244?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-2244:
-------------------------

    Attachment: 2244.patch

Patch that skips opening of new daughter regions post creation.  Its not necessary.  Should
make splits run a little faster and take a little load off hdfs/nn.

> 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
>
>         Attachments: 2244.patch
>
>
> (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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