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Date: Mon, 10 Nov 2008 11:05:44 -0800 (PST)
From: "Jim Kellerman (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Resolved: (HBASE-964) Startup stuck "waiting for root
 region"
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     [ https://issues.apache.org/jira/browse/HBASE-964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jim Kellerman resolved HBASE-964.
---------------------------------

    Resolution: Fixed

The latest patch seems to have resolved the problem.

> Startup stuck "waiting for root region"
> ---------------------------------------
>
>                 Key: HBASE-964
>                 URL: https://issues.apache.org/jira/browse/HBASE-964
>             Project: Hadoop HBase
>          Issue Type: Bug
>         Environment: TRUNK
>            Reporter: stack
>            Assignee: Jim Kellerman
>             Fix For: 0.19.0
>
>         Attachments: 964-logs-1.zip, 964-v2.patch, 964.patch, hbase-964-v1.patch
>
>
> Seems easy to reproduce.
> I am trying to start a master then start a regionserver.  I'm using local filesystem.
> I start master like this:
> {code}
> ./bin/hbase master start
> {code}
> The regionserver similarly.
> All comes up. Then I try to run sequentialWriter from PE.
> Here is what shows in master log:
> {code}
> ...
> 08/10/27 15:20:00 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:20:02 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:20:04 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:20:06 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:20:06 INFO master.BaseScanner: RegionManager.rootScanner scanning meta region {regionname: -ROOT-,,0, startKey: <>, server: 208.84.6.64:60020}
> 08/10/27 15:20:07 DEBUG master.BaseScanner: RegionManager.rootScanner REGION => {NAME => '.META.,,1', STARTKEY => '', ENDKEY => '', ENCODED => 1028785192, TABLE => {{NAME => '.META.', IS_ROOT => 'false', IS_META => 'true', FAMILIES => [{NAME => 'info', BLOOMFILTER => 'false', VERSIONS => '1', COMPRESSION => 'NONE', LENGTH => '2147483647', TTL => '-1', IN_MEMORY => 'false', BLOCKCACHE => 'false'}, {NAME => 'historian', BLOOMFILTER => 'false', VERSIONS => '2147483647', COMPRESSION => 'NONE', LENGTH => '2147483647', TTL => '-1', IN_MEMORY => 'false', BLOCKCACHE => 'false'}]}}}, SERVER => '208.84.6.64:60020', STARTCODE => 1225145942330
> 08/10/27 15:20:07 INFO master.BaseScanner: RegionManager.rootScanner scan of meta region {regionname: -ROOT-,,0, startKey: <>, server: 208.84.6.64:60020} complete
> 08/10/27 15:20:08 DEBUG client.HConnectionManager$TableServers: Attempt 0 of 10 failed with <org.apache.hadoop.hbase.client.NoServerForRegionException: Timed out trying to locate root region>. Retrying after sleep of 2000
> 08/10/27 15:20:08 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:20:10 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> ...
> {code}
> Here is the regionserver log:
> {code}
> ....
> 08/10/27 15:19:09 DEBUG regionserver.CompactSplitThread: Compaction requested for region: .META.,,1
> 08/10/27 15:19:09 INFO regionserver.HRegion: starting compaction on region .META.,,1
> 08/10/27 15:19:09 INFO regionserver.HRegion: compaction completed on region .META.,,1 in 0sec
> 08/10/27 15:19:48 INFO regionserver.HRegionServer: MSG_REGION_OPEN: TestTable,,1225145988632
> 08/10/27 15:19:48 INFO regionserver.HRegionServer: MSG_REGION_OPEN: TestTable,,1225145988632
> 08/10/27 15:19:48 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:19:50 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:19:52 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:19:54 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:19:56 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:19:58 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:20:00 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:20:02 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:20:04 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:20:07 DEBUG client.HConnectionManager$TableServers: Sleeping 2000ms, waiting for root region.
> 08/10/27 15:20:09 DEBUG client.HConnectionManager$TableServers: Attempt 0 of 10 failed with <org.apache.hadoop.hbase.client.NoServerForRegionException: Timed out trying to locate root region>. Retrying after sleep of 2000
> ...
> {code}
> and so on.
> Giving to Jim since he was hereabouts most recently.

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