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Date: Wed, 23 Apr 2008 14:59:21 -0700 (PDT)
From: "Jim Kellerman (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Assigned: (HBASE-549) Don't CLOSE region if message is not
 from server that opened it or is opening it
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     [ https://issues.apache.org/jira/browse/HBASE-549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jim Kellerman reassigned HBASE-549:
-----------------------------------

    Assignee: Jim Kellerman

> Don't CLOSE region if message is not from server that opened it or is opening it
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-549
>                 URL: https://issues.apache.org/jira/browse/HBASE-549
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.16.0, 0.2.0, 0.1.0, 0.1.1
>            Reporter: stack
>            Assignee: Jim Kellerman
>             Fix For: 0.2.0
>
>
> We assign a region to a server.  It takes too long to open (HBASE-505).  Region gets assigned to another server.  Meantime original host returns a MSG_REPORT_CLOSE (because other regions opening messes it up moving files on disk out from under it).  We queue a shutdown which marks the region as needing reassignment.  Second server reports in that it successfully opened the region.  Master tells it it should not have opened it.  Churn ensues.
> Fix is to ignore the CLOSE if its reported server/startcode does not match that of the server currently trying to open region.  Fix is not easy because currently we don't keep list of server info in unassigned regions.
> Here's master log snippet showing problem:
> {code}
> ...
> 2008-03-25 19:16:43,711 INFO org.apache.hadoop.hbase.HMaster: assigning region enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482 to server XX.XX.XX.220:60020
> 2008-03-25 19:16:46,725 DEBUG org.apache.hadoop.hbase.HMaster: Received MSG_REPORT_PROCESS_OPEN : enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482 from XX.XX.XX.220:60020
> 2008-03-25 19:18:06,411 DEBUG org.apache.hadoop.hbase.HMaster: shutdown scanner looking at enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482
> 2008-03-25 19:18:06,811 DEBUG org.apache.hadoop.hbase.HMaster: shutdown scanner looking at enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482
> 2008-03-25 19:19:46,841 INFO org.apache.hadoop.hbase.HMaster: assigning region enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482 to server XX.XX.XX.221:60020
> 2008-03-25 19:19:49,849 DEBUG org.apache.hadoop.hbase.HMaster: Received MSG_REPORT_PROCESS_OPEN : enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482 from XX.XX.XX.221:60020
> 2008-03-25 19:19:56,883 DEBUG org.apache.hadoop.hbase.HMaster: Received MSG_REPORT_CLOSE : enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482 from XX.XX.XX.220:60020
> 2008-03-25 19:19:56,883 INFO org.apache.hadoop.hbase.HMaster: XX.XX.XX.220:60020 no longer serving regionname: enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482, startKey: <iLStZ0yTnfVUziYcNVVxWV==>, endKey: <jLB27Q4hKls4tSvp64rJfF==
> >, encodedName: 1857033608, tableDesc: {name: enwiki_080103, families: {alternate_title:={name: alternate_title, max versions: 3, compression: NONE, in memory: false, max length: 2147483647, bloom filter: none}, alternate_url:={name: al
> ternate_url, max versions: 3, compression: NONE, in memory: false, max length: 2147483647, bloom filter: none}, anchor:={name: anchor, max versions: 3, compression: NONE, in memory: false, max length: 2147483647, bloom filter: none}, mi
> sc:={name: misc, max versions: 3, compression: NONE, in memory: false, max length: 2147483647, bloom filter: none}, page:={name: page, max versions: 3, compression: NONE, in memory: false, max length: 2147483647, bloom filter: none}, re
> direct:={name: redirect, max versions: 3, compression: NONE, in memory: false, max length: 2147483647, bloom filter: none}}}
> 2008-03-25 19:19:56,885 DEBUG org.apache.hadoop.hbase.HMaster: Main processing loop: ProcessRegionClose of enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482, true, false
> 2008-03-25 19:19:56,885 INFO org.apache.hadoop.hbase.HMaster: region closed: enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482
> 2008-03-25 19:19:56,887 INFO org.apache.hadoop.hbase.HMaster: reassign region: enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482
> 2008-03-25 19:19:57,288 INFO org.apache.hadoop.hbase.HMaster: assigning region enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482 to server XX.XX.XX.189:60020
> 2008-03-25 19:20:00,296 DEBUG org.apache.hadoop.hbase.HMaster: Received MSG_REPORT_PROCESS_OPEN : enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482 from XX.XX.XX.189:60020
> 2008-03-25 19:20:16,885 DEBUG org.apache.hadoop.hbase.HMaster: Received MSG_REPORT_OPEN : enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482 from XX.XX.XX.221:60020
> 2008-03-25 19:20:16,885 DEBUG org.apache.hadoop.hbase.HMaster: region server XX.XX.XX.221:60020 should not have opened region enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482
> 2008-03-25 19:23:51,707 DEBUG org.apache.hadoop.hbase.HMaster: shutdown scanner looking at enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482
> 2008-03-25 19:23:51,834 DEBUG org.apache.hadoop.hbase.HMaster: shutdown scanner looking at enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482
> 2008-03-25 19:23:53,947 INFO org.apache.hadoop.hbase.HMaster: assigning region enwiki_080103,iLStZ0yTnfVUziYcNVVxWV==,1205393076482 to server XX.XX.XX.97:60020
> ...
> {code}

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