BaseScanner results can't be trusted at all (Related to hbase-1784)
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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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