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https://issues.apache.org/jira/browse/HBASE-4134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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gaojinchao updated HBASE-4134:
------------------------------
Fix Version/s: (was: 0.92.0)
0.94.0
> The total number of regions was more than the actual region count after the
> hbck fix
> ------------------------------------------------------------------------------------
>
> Key: HBASE-4134
> URL: https://issues.apache.org/jira/browse/HBASE-4134
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.90.3
> Reporter: feng xu
> Fix For: 0.94.0
>
>
> 1. I found the problem(some regions were multiply assigned) while running
> hbck to check the cluster's health. Here's the result:
> {noformat}
> ERROR: Region test1,230778,1311216270050.fff783529fcd983043610eaa1cc5c2fe. is
> listed in META on region server 158-1-91-101:20020 but is multiply assigned
> to region servers 158-1-91-101:20020, 158-1-91-105:20020
> ERROR: Region test1,252103,1311216293671.fff9ed2cb69bdce535451a07686c0db5. is
> listed in META on region server 158-1-91-101:20020 but is multiply assigned
> to region servers 158-1-91-101:20020, 158-1-91-105:20020
> ERROR: Region test1,282187,1311216322104.ffff52782c0241a598b3e37ca8729da0. is
> listed in META on region server 158-1-91-103:20020 but is multiply assigned
> to region servers 158-1-91-103:20020, 158-1-91-105:20020
> Summary:
> -ROOT- is okay.
> Number of regions: 1
> Deployed on: 158-1-91-105:20020
> .META. is okay.
> Number of regions: 1
> Deployed on: 158-1-91-103:20020
> test1 is okay.
> Number of regions: 25297
> Deployed on: 158-1-91-101:20020 158-1-91-103:20020 158-1-91-105:20020
> 14829 inconsistencies detected.
> Status: INCONSISTENT
> {noformat}
> 2. Then I tried to use "hbck -fix" to fix the problem. Everything seemed ok.
> But I found that the total number of regions reported by load balancer
> (35029) was more than the actual region count(25299) after the fixing.
> Here's the related logs snippet:
> {noformat}
> 2011-07-22 02:19:02,866 INFO org.apache.hadoop.hbase.master.LoadBalancer:
> Skipping load balancing. servers=3 regions=25299 average=8433.0
> mostloaded=8433
> 2011-07-22 03:06:11,832 INFO org.apache.hadoop.hbase.master.LoadBalancer:
> Skipping load balancing. servers=3 regions=35029 average=11676.333
> mostloaded=11677 leastloaded=11676
> {noformat}
> 3. I tracked one region's behavior during the time. Taking the region of
> "test1,282187,1311216322104.ffff52782c0241a598b3e37ca8729da0." as example:
> (1) It was assigned to "158-1-91-101" at first.
> (2) HBCK sent closing request to RegionServer. And RegionServer closed it
> silently without notice to HMaster.
> (3) The region was still carried by RS "158-1-91-103" which was known to
> HMaster.
> (4) HBCK will trigger a new assignment.
> The fact is, the region was assigned again, but the old assignment
> information still remained in AM#regions,AM#servers.
> That's why the problem of "region count was larger than the actual number"
> occurred.
> {noformat}
> Line 178967: 2011-07-22 02:47:51,247 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Handling new unassigned
> node: /hbase/unassigned/ffff52782c0241a598b3e37ca8729da0
> (region=test1,282187,1311216322104.ffff52782c0241a598b3e37ca8729da0.,
> server=HBCKServerName, state=M_ZK_REGION_OFFLINE)
> Line 178968: 2011-07-22 02:47:51,247 INFO
> org.apache.hadoop.hbase.master.AssignmentManager: Handling HBCK triggered
> transition=M_ZK_REGION_OFFLINE, server=HBCKServerName,
> region=ffff52782c0241a598b3e37ca8729da0
> Line 178969: 2011-07-22 02:47:51,248 INFO
> org.apache.hadoop.hbase.master.AssignmentManager: HBCK repair is triggering
> assignment of
> region=test1,282187,1311216322104.ffff52782c0241a598b3e37ca8729da0.
> Line 178970: 2011-07-22 02:47:51,248 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: No previous transition plan
> was found (or we are ignoring an existing plan) for
> test1,282187,1311216322104.ffff52782c0241a598b3e37ca8729da0. so generated a
> random one; hri=test1,282187,1311216322104.ffff52782c0241a598b3e37ca8729da0.,
> src=, dest=158-1-91-101,20020,1311231878544; 3 (online=3, exclude=null)
> available servers
> Line 178971: 2011-07-22 02:47:51,248 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Assigning region
> test1,282187,1311216322104.ffff52782c0241a598b3e37ca8729da0. to
> 158-1-91-101,20020,1311231878544
> Line 178983: 2011-07-22 02:47:51,285 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Handling
> transition=RS_ZK_REGION_OPENING, server=158-1-91-101,20020,1311231878544,
> region=ffff52782c0241a598b3e37ca8729da0
> Line 179001: 2011-07-22 02:47:51,318 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Handling
> transition=RS_ZK_REGION_OPENED, server=158-1-91-101,20020,1311231878544,
> region=ffff52782c0241a598b3e37ca8729da0
> Line 179002: 2011-07-22 02:47:51,319 DEBUG
> org.apache.hadoop.hbase.master.handler.OpenedRegionHandler: Handling OPENED
> event for ffff52782c0241a598b3e37ca8729da0; deleting unassigned node
> Line 179003: 2011-07-22 02:47:51,319 DEBUG
> org.apache.hadoop.hbase.zookeeper.ZKAssign:
> master:20000-0x1314ac5addb0042-0x1314ac5addb0042 Deleting existing unassigned
> node for ffff52782c0241a598b3e37ca8729da0 that is in expected state
> RS_ZK_REGION_OPENED
> Line 179007: 2011-07-22 02:47:51,326 DEBUG
> org.apache.hadoop.hbase.zookeeper.ZKAssign:
> master:20000-0x1314ac5addb0042-0x1314ac5addb0042 Successfully deleted
> unassigned node for region ffff52782c0241a598b3e37ca8729da0 in expected state
> RS_ZK_REGION_OPENED
> Line 179011: 2011-07-22 02:47:51,335 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Overwriting
> ffff52782c0241a598b3e37ca8729da0 on
> serverName=158-1-91-103,20020,1311232056655, load=(requests=0, regions=0,
> usedHeap=0, maxHeap=0)
> Line 179012: 2011-07-22 02:47:51,335 DEBUG
> org.apache.hadoop.hbase.master.handler.OpenedRegionHandler: Opened region
> test1,282187,1311216322104.ffff52782c0241a598b3e37ca8729da0. on
> 158-1-91-101,20020,1311231878544
> {noformat}
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