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From afine <...@git.apache.org>
Subject [GitHub] zookeeper pull request #280: ZOOKEEPER-2806: Flaky test: org.apache.zookeepe...
Date Tue, 13 Jun 2017 18:56:45 GMT
GitHub user afine opened a pull request:

    https://github.com/apache/zookeeper/pull/280

    ZOOKEEPER-2806: Flaky test: org.apache.zookeeper.server.quorum.FLEBackwardElectionRoundTest.testBackwardElectionRound

    Here is an example of a test failure: https://builds.apache.org/job/ZooKeeper_branch34_jdk8/1016/testReport/org.apache.zookeeper.server.quorum/FLEBackwardElectionRoundTest/testBackwardElectionRound/
    
    This flaky test is caused by the reuse of a `ByteBuffer` object between `QuorumCnxManager`s.

    
    When sending a `ByteBuffer` we reset its position first:
    
    ```
            synchronized void send(ByteBuffer b) throws IOException {
                byte[] msgBytes = new byte[b.capacity()];
                try {
                    b.position(0);
                    b.get(msgBytes);
                } catch (BufferUnderflowException be) {
                    LOG.error("BufferUnderflowException ", be);
                    return;
                }
                dout.writeInt(b.capacity());
                dout.write(b.array());
                dout.flush();
            }
    ```
    
    `b.get(msgBytes);` changes the position of the `ByteBuffer`. So we can have a race here
that results in a `BufferUnderflowException` causing a message never to be sent and this test
to fail. 
    
    The fix is to create a new `ByteBuffer` for each message we send in the test.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/afine/zookeeper ZOOKEEPER-2806

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/zookeeper/pull/280.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #280
    
----
commit 384bf271a79333a7d646a74e1e6c326955d7001c
Author: Abraham Fine <abefine@cloudera.com>
Date:   2017-06-13T18:46:48Z

    ZOOKEEPER-2806: Flaky test: org.apache.zookeeper.server.quorum.FLEBackwardElectionRoundTest.testBackwardElectionRound

----


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