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From "Masatake Iwasaki (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12605) Fix intermittent failure of TestIPC.testIpcWithReaderQueuing
Date Mon, 30 Nov 2015 09:56:11 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15031594#comment-15031594
] 

Masatake Iwasaki commented on HADOOP-12605:
-------------------------------------------

{code}
    final int initialClients = readers + callQ + handlers;
    // max connections we should ever end up accepting at once
    final int maxAccept = initialClients + readers*readerQ + 1; // 1 = listener
{code}

The test expects that all readers' queue ({{pendingConnections}}) is full when Listener is
blocked but the assumption is wrong. Listener put connections to queue (by {{Reader#addConnection}})
in round-robin along with {{Listener#getReader}}. Queued connections are processed in non-deterministic
order by reader threads. If one of the reader's queue becomes full first then Listener trying
to add connection to the queue will block even if other reader's queue have room. The number
of connections accepted until Listener blocks could be less than the {{maxAccept}} due to
this. ({{maxAccept > server.getNumOpenConnections()}})


> Fix intermittent failure of TestIPC.testIpcWithReaderQueuing
> ------------------------------------------------------------
>
>                 Key: HADOOP-12605
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12605
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: test
>            Reporter: Masatake Iwasaki
>            Assignee: Masatake Iwasaki
>            Priority: Minor
>




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