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From "Heng Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14431) AsyncRpcClient#removeConnection() never removes connection from connections pool if server fails
Date Tue, 15 Sep 2015 14:14:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14745518#comment-14745518
] 

Heng Chen commented on HBASE-14431:
-----------------------------------

{quote}
Is it a better choice to override hashCode method in AsyncRpcChannel ?
I don't see that method. Can you elaborate ?
{quote}

In class {{AsyncRpcChannel}}, we override {{hashCode}} method just like 

{code}
  @Override
  public int hashCode() {
    return getConnectionHashCode();
  }
{code}

Any concerns?

> AsyncRpcClient#removeConnection() never removes connection from connections pool if server
fails
> ------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-14431
>                 URL: https://issues.apache.org/jira/browse/HBASE-14431
>             Project: HBase
>          Issue Type: Bug
>          Components: IPC/RPC
>    Affects Versions: 2.0.0, 1.0.2, 1.1.2
>            Reporter: Samir Ahmic
>            Assignee: Samir Ahmic
>            Priority: Critical
>
> I was playing with master branch in distributed mode (3 rs + master + backup_master)
and notice strange behavior when i was testing this sequence of events on single rs: /kill/start/run_balancer
while client was writing data to cluster (LoadTestTool).
> I have notice that LTT fails with following:
> {code}
> 2015-09-09 11:05:58,364 INFO  [main] client.AsyncProcess: #2, waiting for some tasks
to finish. Expected max=0, tasksInProgress=35
> Exception in thread "main" org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException:
Failed 1 action: BindException: 1 time, 
> 	at org.apache.hadoop.hbase.client.AsyncProcess$BatchErrors.makeException(AsyncProcess.java:228)
> 	at org.apache.hadoop.hbase.client.AsyncProcess$BatchErrors.access$1800(AsyncProcess.java:208)
> 	at org.apache.hadoop.hbase.client.AsyncProcess.waitForAllPreviousOpsAndReset(AsyncProcess.java:1697)
> 	at org.apache.hadoop.hbase.client.BufferedMutatorImpl.backgroundFlushCommits(BufferedMutatorImpl.java:211)
> {code}
> After some digging  and adding some more logging in code i have notice that following
condition in  {code}AsyncRpcClient.removeConnection(AsyncRpcChannel connection) {code} is
never true:
> {code}
> if (connectionInPool == connection) {
> {code} 
> causing that  {code}AsyncRpcChannel{code} connection is never removed from {code}connections{code}
pool in case rs fails.
> After changing this condition to:
> {code}
> if (connectionInPool.address.equals(connection.address)) {
> {code}
> issue was resolved and client was removing failed server from connections pool.
> I will attach patch after running some more tests.



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