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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1878) BaseScanner results can't be trusted at all (Related to hbase-1784)
Date Wed, 30 Sep 2009 23:37:23 GMT
BaseScanner results can't be trusted at all (Related to hbase-1784)
-------------------------------------------------------------------

                 Key: HBASE-1878
                 URL: https://issues.apache.org/jira/browse/HBASE-1878
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: stack


Gario this morning got a few double-assignments doing rolling restart.

{code}
   1.
      Sep 29 15:18:24 hnn0.int.meetup.com [hbase] 2009-09-29 15:18:24,010 [IPC Server handler
177 on 60000] INFO  org.apache.hadoop.hbase.master.ServerManager  - Processing MSG_REPORT_CLOSE:
MemberFeedIndex,8828808,1252839447949 from hdn8.int.meetup.com,60020,1253572119095
   2.
      Sep 29 15:18:39 hnn0.int.meetup.com [hbase] 2009-09-29 15:18:39,369 [IPC Server handler
4 on 60000] INFO  org.apache.hadoop.hbase.master.RegionManager  - Assigning region MemberFeedIndex,8828808,1252839447949
to hdn7.int.meetup.com,60020,1254251818253
   3.
      Sep 29 15:18:42 hnn0.int.meetup.com [hbase] 2009-09-29 15:18:42,399 [IPC Server handler
32 on 60000] INFO  org.apache.hadoop.hbase.master.ServerManager  - Processing MSG_REPORT_PROCESS_OPEN:
MemberFeedIndex,8828808,1252839447949 from hdn7.int.meetup.com,60020,1254251818253; 3 of 19
   4.
      Sep 29 15:18:42 hnn0.int.meetup.com [hbase] 2009-09-29 15:18:42,400 [IPC Server handler
32 on 60000] INFO  org.apache.hadoop.hbase.master.ServerManager  - Processing MSG_REPORT_OPEN:
MemberFeedIndex,8828808,1252839447949 from hdn7.int.meetup.com,60020,1254251818253; 13 of
19
   5.
      Sep 29 15:19:01 hnn0.int.meetup.com [hbase] 2009-09-29 15:19:01,195 [HMaster] INFO 
org.apache.hadoop.hbase.master.RegionServerOperation  - MemberFeedIndex,8828808,1252839447949
open on 192.168.60.213:60020
   6.
      Sep 29 15:19:01 hnn0.int.meetup.com [hbase] 2009-09-29 15:19:01,196 [HMaster] INFO 
org.apache.hadoop.hbase.master.RegionServerOperation  - Updated row MemberFeedIndex,8828808,1252839447949
in region .META.,,1 with startcode=1254251818253, server=192.168.60.213:60020
   7.
      Sep 29 15:19:01 hnn0.int.meetup.com [hbase] 2009-09-29 15:19:01,230 [RegionManager.metaScanner]
DEBUG org.apache.hadoop.hbase.master.BaseScanner  - Current assignment of MemberFeedIndex,8828808,1252839447949
is not valid;  serverAddress=192.168.60.214:60020, startCode=1253572119095 unknown.
   8.
      Sep 29 15:19:03 hnn0.int.meetup.com [hbase] 2009-09-29 15:19:03,059 [IPC Server handler
88 on 60000] INFO  org.apache.hadoop.hbase.master.RegionManager  - Assigning region MemberFeedIndex,8828808,1252839447949
to hdn8.int.meetup.com,60020,1254251940990
   9.
      Sep 29 15:19:06 hnn0.int.meetup.com [hbase] 2009-09-29 15:19:06,089 [IPC Server handler
97 on 60000] INFO  org.apache.hadoop.hbase.master.ServerManager  - Processing MSG_REPORT_OPEN:
MemberFeedIndex,8828808,1252839447949 from hdn8.int.meetup.com,60020,1254251940990; 10 of
19
  10.
      Sep 29 15:19:06 hnn0.int.meetup.com [hbase] 2009-09-29 15:19:06,091 [HMaster] INFO 
org.apache.hadoop.hbase.master.RegionServerOperation  - MemberFeedIndex,8828808,1252839447949
open on 192.168.60.214:60020
  11.
      Sep 29 15:19:06 hnn0.int.meetup.com [hbase] 2009-09-29 15:19:06,092 [HMaster] INFO 
org.apache.hadoop.hbase.master.RegionServerOperation  - Updated row MemberFeedIndex,8828808,1252839447949
in region .META.,,1 with startcode=1254251940990, server=192.168.60.214:60020
{code}

There's 35ms between update of row and ruling of region being unassigned.

HBASE-1784 added a GET on .META. row before ruling a region unassigned IFF the server cell
was empty.

Need to do this GET every time.  BaseScanner can't be trusted.  Its info is stale.   Need
to hurry up with 0.21 rewrite.

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