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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1121) Cluster confused about where -ROOT- is
Date Wed, 21 Jan 2009 07:15:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665742#action_12665742
] 

stack commented on HBASE-1121:
------------------------------

I've spent a bunch of time trying to reproduce but cannot.  I put up 4  node cluster and tried
various sequences of moving -ROOT- around cluster and then .META.   I wanted to reproduce
so I could prove the J-D (+nitay) found issue fixed this prob.

I think I should commit the below anyways:

{code}
Index: src/java/org/apache/hadoop/hbase/client/HConnectionManager.java
===================================================================
--- src/java/org/apache/hadoop/hbase/client/HConnectionManager.java     (revision 736178)
+++ src/java/org/apache/hadoop/hbase/client/HConnectionManager.java     (working copy)
@@ -445,7 +445,8 @@
           // second waits. The second thread will not do find.
           
           if (!useCache || rootRegionLocation == null) {
-            return locateRootRegion();
+            // Cache new location.
+            this.rootRegionLocation = locateRootRegion();
           }
           r
{code}
 ...maybe I need to open a new issue to do it.

> Cluster confused about where -ROOT- is
> --------------------------------------
>
>                 Key: HBASE-1121
>                 URL: https://issues.apache.org/jira/browse/HBASE-1121
>             Project: Hadoop HBase
>          Issue Type: Bug
>         Environment: TRUNK trying to do big upload
>            Reporter: stack
>            Assignee: Jim Kellerman
>         Attachments: 1121.patch
>
>
> Each node in cluster is doing below:
> {code}
> 2009-01-11 20:52:22,739 [regionserver/0:0:0:0:0:0:0:0:60020.compactor] DEBUG org.apache.hadoop.hbase.client.HConnectionManager$TableServers:
Attempt 0 of 10 failed with <org.apache.hadoop.hbase.NotServingRegionException: org.apache.hadoop.hbase.NotServingRegionException:
-ROOT-,,0
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2064)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.getClosestRowBefore(HRegionServer.java:1545)
>         at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:632)
>         at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:894)
> >. Retrying after sleep of 20002009-01-11 20:52:22,742 [regionserver/0:0:0:0:0:0:0:0:60020.compactor]
DEBUG org.apache.hadoop.hbase.client.HConnectionManager$TableServers: Found ROOT REGION =>
{NAME => '-ROOT-,,0', STARTKEY => '', ENDKEY => '', ENCODED => 70236052, TABLE
=> {{NAME => '-ROOT-', IS_ROOT => 'true', IS_META => 'true', FAMILIES => [{NAME
=> 'info', BLOOMFILTER => 'false', COMPRESSION => 'NONE', VERSIONS => '10', LENGTH
=> '2147483647', TTL => '-1', IN_MEMORY => 'false', BLOCKCACHE => 'true'}], INDEXES
=> []}}2009-01-11 20:52:24,759 [regionserver/0:0:0:0:0:0:0:0:60020.compactor] DEBUG org.apache.hadoop.hbase.client.HConnectionManager$TableServers:
Attempt 1 of 10 failed with <org.apache.hadoop.hbase.NotServingRegionException: org.apache.hadoop.hbase.NotServingRegionException:
-ROOT-,,0
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2064)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.getClosestRowBefore(HRegionServer.java:1545)
>         at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:632)
>         at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:894)
> {code}
> I tried to close the root region and tripped over hbase-1120.
> So I killed the regionserver hosting -ROOT- but weirdly had no effect as though the 
regionservers' internal cache of -ROOT- location cannot be changed.

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