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https://issues.apache.org/jira/browse/TAJO-1391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14360026#comment-14360026
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ASF GitHub Bot commented on TAJO-1391:
--------------------------------------
Github user ykrips commented on the pull request:
https://github.com/apache/tajo/pull/412#issuecomment-78837635
Client does not check the connection status. Can you check this exception?
```
com.google.protobuf.ServiceException:
org.apache.tajo.rpc.TajoServiceException:
java.nio.channels.ClosedChannelException
at
org.apache.tajo.rpc.BlockingRpcClient$ProxyRpcChannel.callBlockingMethod(BlockingRpcClient.java:115)
at
org.apache.tajo.ipc.TajoMasterClientProtocol$TajoMasterClientProtocolService$BlockingStub.getAllDatabases(TajoMasterClientProtocol.java:2163)
at
org.apache.tajo.client.CatalogAdminClientImpl$4.call(CatalogAdminClientImpl.java:106)
at
org.apache.tajo.client.CatalogAdminClientImpl$4.call(CatalogAdminClientImpl.java:100)
at
org.apache.tajo.rpc.ServerCallable.withRetries(ServerCallable.java:94)
at
org.apache.tajo.client.CatalogAdminClientImpl.getAllDatabaseNames(CatalogAdminClientImpl.java:99)
at
org.apache.tajo.client.TajoClientImpl.getAllDatabaseNames(TajoClientImpl.java:186)
at
org.apache.tajo.client.TestTajoClient.testSelectDatabaseToInvalidOne(TestTajoClient.java:145)
```
> RpcConnectionPool should check reference counter of connection before close
> ---------------------------------------------------------------------------
>
> Key: TAJO-1391
> URL: https://issues.apache.org/jira/browse/TAJO-1391
> Project: Tajo
> Issue Type: Improvement
> Components: rpc
> Reporter: Navis
> Assignee: Navis
>
> Connections in the pool is shared one and should be closed only when it's not
> referenced by other threads. Furthermore, current pool implementation locks
> whole connections for connecting/closing a connection, making bad
> interferences on other operations (on sane connection).
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