[jira] [Created] (HBASE-26518) Concurrent assign the same region may cause regionserver abort

["Xiaolin Ha (Jira)" <ji...@apache.org>]

Xiaolin Ha created HBASE-26518:
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             Summary: Concurrent assign the same region may cause regionserver abort
                 Key: HBASE-26518
                 URL: https://issues.apache.org/jira/browse/HBASE-26518
             Project: HBase
          Issue Type: Bug
          Components: master, Region Assignment
    Affects Versions: 1.2.0
            Reporter: Xiaolin Ha
            Assignee: Xiaolin Ha
         Attachments: master-error-logs.png

When concurrent assign a region, the RS may abort when reporting region state to master encounters transit region state error, 

 
{code:java}
2021-11-26 04:40:54,689 INFO  [PostOpenDeployTasks:ee1df69da9c7fb7698d2972f81d40b65] regionserver.HRegionServer: Post open deploy tasks for growthosudx:growthos-udx_dmx_supply_waimaisku_application_basic,cc,1631020952330.ee1df69da9c7fb7698d2972f81d40b65.
2021-11-26 04:40:54,689 INFO  [PostOpenDeployTasks:ee1df69da9c7fb7698d2972f81d40b65] regionserver.HRegionServer: Failed to transition {ENCODED => ee1df69da9c7fb7698d2972f81d40b65, NAME => 'growthosudx:growthos-udx_dmx_supply_waimaisku_application_basic,cc,1631020952330.ee1df69da9c7fb7698d2972f81d40b65.', STARTKEY => 'cc', ENDKEY => 'cd'} to OPENED: ee1df69da9c7fb7698d2972f81d40b65 is not pending open on zf-data-hbase250.mt,16020,1637872783437
2021-11-26 04:40:54,689 FATAL [PostOpenDeployTasks:ee1df69da9c7fb7698d2972f81d40b65] regionserver.HRegionServer: ABORTING region server zf-data-hbase250.mt,16020,1637872783437: Exception running postOpenDeployTasks; region=ee1df69da9c7fb7698d2972f81d40b65
java.io.IOException: Failed to report opened region to master: growthosudx:growthos-udx_dmx_supply_waimaisku_application_basic,cc,1631020952330.ee1df69da9c7fb7698d2972f81d40b65.
        at org.apache.hadoop.hbase.regionserver.HRegionServer.postOpenDeployTasks(HRegionServer.java:2387)
        at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler$PostOpenDeployTasksThread.run(OpenRegionHandler.java:327)  {code}
In the master log, we can see that the region is being assigned by both the bulk assigner and the SCP.

!master-error-logs.png|width=600,height=140!

This steps can reproduce the problem:
 # thread 1 calls Assignment#assign to assign region A, and calls RegionStates#updateRegionsState and stops before the synchronize;
 #  thread 2 calls RegionStates#serverOffline and gets the lock, it sees that region A is on the processed dead server and add region A to the regionsToOffline list(region A is not in the RIT cache now);
 # thread 2 prepare to execute RegionStates#regionOffline, and released the lock;
 # thread 1 get the lock, and add region A to the RIT cache, and also update the region state by RegionStates#putRegionState, set the region state from OFFLINE to PENDING_OPEN, then release the lock;
 # thread2 execute  RegionStates#regionOffline, acquires the lock and sets the region state from PENDING_OPEN to OFFLINE;
 # the RS that region A assigned by thread 1 report region A should be transited to OPENED, but finds that region A last state is OFFLINE, error occures, the RS abort itself.

 

 



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