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https://issues.apache.org/jira/browse/HBASE-14361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14732301#comment-14732301
]
Heng Chen commented on HBASE-14361:
-----------------------------------
I print stack trace in {{ConnectionImplementation}} constructor.
And found there are five {{ConnectionImplementation}} instance after running
start-hbase.sh standalone.
I upload the hmaster.log, and the stack trace below:
{code}
0 java.lang.Throwable
1 >---at
org.apache.hadoop.hbase.client.ConnectionImplementation.<init>(ConnectionImplementation.java:217)
2 >---at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
3 >---at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
4 >---at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
5 >---at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
6 >---at
org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:231)
7 >---at
org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:118)
8 >---at
org.apache.hadoop.hbase.master.ServerManager.<init>(ServerManager.java:222)
9 >---at
org.apache.hadoop.hbase.master.ServerManager.<init>(ServerManager.java:212)
10 >---at
org.apache.hadoop.hbase.master.HMaster.createServerManager(HMaster.java:853)
11 >---at
org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:661)
12 >---at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:180)
13 >---at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1670)
14 >---at java.lang.Thread.run(Thread.java:745)
34 2015-09-06 16:07:20,904 INFO [RS:0;10.0.3.80:52456]
client.ConnectionImplementation:.
33 java.lang.Throwable
32 >---at
org.apache.hadoop.hbase.client.ConnectionImplementation.<init>(ConnectionImplementation.java:217)
31 >---at
org.apache.hadoop.hbase.client.ConnectionUtils$1.<init>(ConnectionUtils.java:128)
30 >---at
org.apache.hadoop.hbase.client.ConnectionUtils.createShortCircuitConnection(ConnectionUtils.java:128)
29 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.createClusterConnection(HRegionServer.java:686)
28 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.setupClusterConnection(HRegionServer.java:717)
27 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.preRegistrationInitialization(HRegionServer.java:730)
26 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:885)
25 >---at java.lang.Thread.run(Thread.java:745)
24 2015-09-06 16:07:20,905 INFO [M:0;10.0.3.80:52454]
client.ConnectionImplementation:.
23 java.lang.Throwable
22 >---at
org.apache.hadoop.hbase.client.ConnectionImplementation.<init>(ConnectionImplementation.java:217)
21 >---at
org.apache.hadoop.hbase.client.ConnectionUtils$1.<init>(ConnectionUtils.java:128)
20 >---at
org.apache.hadoop.hbase.client.ConnectionUtils.createShortCircuitConnection(ConnectionUtils.java:128)
19 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.createClusterConnection(HRegionServer.java:686)
18 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.setupClusterConnection(HRegionServer.java:717)
17 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.preRegistrationInitialization(HRegionServer.java:730)
16 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:885)
15 >---at
org.apache.hadoop.hbase.master.HMasterCommandLine$LocalHMaster.run(HMasterCommandLine.java:311)
14 >---at java.lang.Thread.run(Thread.java:745)
0 java.lang.Throwable
1 >---at
org.apache.hadoop.hbase.client.ConnectionImplementation.<init>(ConnectionImplementation.java:217)
2 >---at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
3 >---at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
4 >---at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
5 >---at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
6 >---at
org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:231)
7 >---at
org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:118)
8 >---at
org.apache.hadoop.hbase.replication.regionserver.ReplicationSink.<init>(ReplicationSink.java:91)
9 >---at
org.apache.hadoop.hbase.replication.regionserver.Replication.startReplicationService(Replication.java:213)
10 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.startServiceThreads(HRegionServer.java:1730)
11 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.handleReportForDutyResponse(HRegionServer.java:1374)
12 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:908)
13 >---at
org.apache.hadoop.hbase.master.HMasterCommandLine$LocalHMaster.run(HMasterCommandLine.java:311)
14 >---at java.lang.Thread.run(Thread.java:745)
24 java.lang.Throwable
23 >---at
org.apache.hadoop.hbase.client.ConnectionImplementation.<init>(ConnectionImplementation.java:217)
22 >---at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
21 >---at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
20 >---at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
19 >---at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
18 >---at
org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:231)
17 >---at
org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:118)
16 >---at
org.apache.hadoop.hbase.replication.regionserver.ReplicationSink.<init>(ReplicationSink.java:91)
15 >---at
org.apache.hadoop.hbase.replication.regionserver.Replication.startReplicationService(Replication.java:213)
14 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.startServiceThreads(HRegionServer.java:1730)
13 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.handleReportForDutyResponse(HRegionServer.java:1374)
12 >---at
org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:908)
11 >---at java.lang.Thread.run(Thread.java:745)
{code}
It seems Replication create two instance, RS create two instance, and
hmaster create one.
Hopes it will be helpful.
> Investigate unused connection objects
> -------------------------------------
>
> Key: HBASE-14361
> URL: https://issues.apache.org/jira/browse/HBASE-14361
> Project: HBase
> Issue Type: Task
> Components: Client
> Reporter: Nick Dimiduk
>
> Over on HBASE-12911 I have a patch that registers Connection instances with
> the metrics system. In both standalone server and tll client applications, I
> was surprised to see multiple connection objects showing up that are unused.
> These are pretty heavy objects, including lots of client threads for the
> batch pool. We should track these down and remove them -- if they're not some
> kind of phantom artifacts of my WIP patch over there.
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