[ 
https://issues.apache.org/jira/browse/HBASE-21928?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Duo Zhang updated HBASE-21928:
------------------------------
    Description: 
[INFO] Running 
org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 41.604 
s <<< FAILURE! - in 
org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck
[ERROR] 
test(org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck)  
Time elapsed: 30.496 s  <<< ERROR!
java.util.concurrent.TimeoutException
        at 
org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck.test(TestServerCrashProcedureCarryingMetaStuck.java:93)

The META_QOS is introduced by HBASE-21754 and misused in HBASE-21907 as the 
name is a abit 

  was:
[INFO] Running 
org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 41.604 
s <<< FAILURE! - in 
org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck
[ERROR] 
test(org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck)  
Time elapsed: 30.496 s  <<< ERROR!
java.util.concurrent.TimeoutException
        at 
org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck.test(TestServerCrashProcedureCarryingMetaStuck.java:93)

As described in HBASE-21907, the implementation for HMaster is a bit 
complicated so we if mix the report region transition call and other priority 
calls in the same executor, it will be easy to lead to dead lock. So let's use 
MasterFifoRpcScheduler by default for HMaster.


> Deprecated HConstants.META_QOS
> ------------------------------
>
>                 Key: HBASE-21928
>                 URL: https://issues.apache.org/jira/browse/HBASE-21928
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Zheng Hu
>            Assignee: Duo Zhang
>            Priority: Major
>             Fix For: 3.0.0, 2.2.0, 2.3.0
>
>         Attachments: HBASE-21928.patch
>
>
> [INFO] Running 
> org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck
> [ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 
> 41.604 s <<< FAILURE! - in 
> org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck
> [ERROR] 
> test(org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck)
>   Time elapsed: 30.496 s  <<< ERROR!
> java.util.concurrent.TimeoutException
>       at 
> org.apache.hadoop.hbase.master.TestServerCrashProcedureCarryingMetaStuck.test(TestServerCrashProcedureCarryingMetaStuck.java:93)
> The META_QOS is introduced by HBASE-21754 and misused in HBASE-21907 as the 
> name is a abit 



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