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https://issues.apache.org/jira/browse/HBASE-1878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762413#action_12762413
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Jonathan Gray commented on HBASE-1878:
--------------------------------------
Patch looks good.
> 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
> Fix For: 0.20.1, 0.21.0
>
> Attachments: basescanner.patch
>
>
> 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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