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Date: Mon, 14 Sep 2015 17:44:46 +0000 (UTC)
From: "Samir Ahmic (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Created] (HBASE-14431) AsyncRpcClient#removeConnection()
 never removes connection from connections pool if server fails
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Samir Ahmic created HBASE-14431:
-----------------------------------

             Summary: 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: 1.1.2, 1.0.2, 2.0.0
            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)
	at org.apache.hadoop.hbase.client.BufferedMutatorImpl.flush(BufferedMutatorImpl.java:186)
	at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:951)
	at org.apache.hadoop.hbase.client.HTable.put(HTable.java:571)
	at org.apache.hadoop.hbase.util.SimpleClient.main(SimpleClient.java:62) 
{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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