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https://issues.apache.org/jira/browse/HADOOP-10406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14959843#comment-14959843
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Xiao Chen commented on HADOOP-10406:
------------------------------------
Hi [~szetszwo],
Thank you for creating this JIRA and adding the detailed failure information!
I have recently seen similar error as well:
* Stacktrace
{noformat}
java.lang.AssertionError: expected:<28> but was:<22>
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.failNotEquals(Assert.java:743)
at org.junit.Assert.assertEquals(Assert.java:118)
at org.junit.Assert.assertEquals(Assert.java:555)
at org.junit.Assert.assertEquals(Assert.java:542)
at org.apache.hadoop.ipc.TestIPC.checkBlocking(TestIPC.java:752)
at
org.apache.hadoop.ipc.TestIPC.testIpcWithReaderQueuing(TestIPC.java:661)
{noformat}
* Standard Output
{noformat}
......
2015-10-12 14:02:26,581 INFO ipc.CallQueueManager
(CallQueueManager.java:<init>(53)) - Using callQueue class
java.util.concurrent.LinkedBlockingQueue
2015-10-12 14:02:26,581 INFO ipc.Server (Server.java:run(605)) - Starting
Socket Reader #1 for port 51555
2015-10-12 14:02:26,581 INFO ipc.Server (Server.java:run(605)) - Starting
Socket Reader #2 for port 51555
2015-10-12 14:02:26,582 INFO ipc.Server (Server.java:run(605)) - Starting
Socket Reader #3 for port 51555
2015-10-12 14:02:26,582 INFO ipc.Server (Server.java:run(605)) - Starting
Socket Reader #4 for port 51555
2015-10-12 14:02:26,584 INFO ipc.Server (Server.java:run(827)) - IPC Server
Responder: starting
2015-10-12 14:02:26,585 INFO ipc.Server (Server.java:run(674)) - IPC Server
listener on 51555: starting
2015-10-12 14:02:26,599 INFO ipc.TestIPC (TestIPC.java:checkBlocking(736)) -
ipc layer should be blocked
2015-10-12 14:02:26,617 INFO ipc.TestIPC (TestIPC.java:checkBlocking(747)) -
(max clients) need:28 connections have:22
{noformat}
And it also appears to be the line {{assertEquals(maxAccept,
server.getNumOpenConnections());}} is causing this.
I will propose a fix shortly.
> TestIPC.testIpcWithReaderQueuing may fail
> -----------------------------------------
>
> Key: HADOOP-10406
> URL: https://issues.apache.org/jira/browse/HADOOP-10406
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Reporter: Tsz Wo Nicholas Sze
>
> The test may fail with AssertionError. The value
> server.getNumOpenConnections() could be larger than maxAccept; see comments
> for more details.
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