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From "Heng Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14455) Try to get rid of unused HConnection instance
Date Mon, 21 Sep 2015 09:49:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14900455#comment-14900455
] 

Heng Chen commented on HBASE-14455:
-----------------------------------

I have a question,  Why {{HMaster}} extends {{HRegionServer}},   it seems there is no relationship
between them.....


Due to this,  {{HMaster}} create two instance, one is created by {{ServerManager}}, the other
is created by {{org.apache.hadoop.hbase.regionserver.HRegionServer.createClusterConnection}}
which {{HMaster}} inherit

> Try to get rid of unused HConnection instance 
> ----------------------------------------------
>
>                 Key: HBASE-14455
>                 URL: https://issues.apache.org/jira/browse/HBASE-14455
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Heng Chen
>            Priority: Minor
>
> After HBASE-14361,  we get rid of HConnection Instance in ReplicationSink in standalone
mode. But there are still three HConnection Instance, i will try to remove unused ones.
> The three instances are created below 
> {code}
>     6 2015-09-21 16:05:36,401 INFO  [10.0.3.80:60429.activeMasterManager] client.ConnectionImplementation:.
>     7 java.lang.Throwable
>     8 >---at org.apache.hadoop.hbase.client.ConnectionImplementation.<init>(ConnectionImplementation.java:217)
>     9 >---at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
>    10 >---at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
>    11 >---at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>    12 >---at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
>    13 >---at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:231)
>    14 >---at org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:118)
>    15 >---at org.apache.hadoop.hbase.master.ServerManager.<init>(ServerManager.java:222)
>    16 >---at org.apache.hadoop.hbase.master.ServerManager.<init>(ServerManager.java:212)
>    17 >---at org.apache.hadoop.hbase.master.HMaster.createServerManager(HMaster.java:853)
>    18 >---at org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:661)
>    19 >---at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:180)
>    20 >---at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1670)
>    21 >---at java.lang.Thread.run(Thread.java:745)
>    22 2015-09-21 16:05:36,401 INFO  [M:0;10.0.3.80:60429] client.ConnectionImplementation:.
>    23 java.lang.Throwable
>    24 >---at org.apache.hadoop.hbase.client.ConnectionImplementation.<init>(ConnectionImplementation.java:217)
>    25 >---at org.apache.hadoop.hbase.client.ConnectionUtils$1.<init>(ConnectionUtils.java:128)
>    26 >---at org.apache.hadoop.hbase.client.ConnectionUtils.createShortCircuitConnection(ConnectionUtils.java:128)
>    27 >---at org.apache.hadoop.hbase.regionserver.HRegionServer.createClusterConnection(HRegionServer.java:686)
>    28 >---at org.apache.hadoop.hbase.regionserver.HRegionServer.setupClusterConnection(HRegionServer.java:717)
>    29 >---at org.apache.hadoop.hbase.regionserver.HRegionServer.preRegistrationInitialization(HRegionServer.java:730)
>    30 >---at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:885)
>    31 >---at org.apache.hadoop.hbase.master.HMasterCommandLine$LocalHMaster.run(HMasterCommandLine.java:311)
>    32 >---at java.lang.Thread.run(Thread.java:745)
>    33 2015-09-21 16:05:36,401 INFO  [RS:0;10.0.3.80:60431] client.ConnectionImplementation:.
>    34 java.lang.Throwable
>    35 >---at org.apache.hadoop.hbase.client.ConnectionImplementation.<init>(ConnectionImplementation.java:217)
>    36 >---at org.apache.hadoop.hbase.client.ConnectionUtils$1.<init>(ConnectionUtils.java:128)
>    37 >---at org.apache.hadoop.hbase.client.ConnectionUtils.createShortCircuitConnection(ConnectionUtils.java:128)
>    38 >---at org.apache.hadoop.hbase.regionserver.HRegionServer.createClusterConnection(HRegionServer.java:686)
>    39 >---at org.apache.hadoop.hbase.regionserver.HRegionServer.setupClusterConnection(HRegionServer.java:717)
>    40 >---at org.apache.hadoop.hbase.regionserver.HRegionServer.preRegistrationInitialization(HRegionServer.java:730)
>    41 >---at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:885)
>    42 >---at java.lang.Thread.run(Thread.java:745)
> {code}



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