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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11494) Lock acquisition on WrappedInputStream#unwrappedRpcBuffer may race with another thread
Date Tue, 03 Feb 2015 14:11:42 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14303299#comment-14303299
] 

Hudson commented on HADOOP-11494:
---------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk #2025 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/2025/])
HADOOP-11494. Lock acquisition on WrappedInputStream#unwrappedRpcBuffer may race with another
thread. Contributed by Ted Yu. (benoy: rev 3472e3bd6c50558870b86c9ccfea5072385fa991)
* hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslRpcClient.java


> Lock acquisition on WrappedInputStream#unwrappedRpcBuffer may race with another thread
> --------------------------------------------------------------------------------------
>
>                 Key: HADOOP-11494
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11494
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>            Priority: Minor
>             Fix For: 2.7.0
>
>         Attachments: hadoop-11494-001.patch, hadoop-11494-002.patch
>
>
> In SaslRpcClient, starting at line 576:
> {code}
>     public int read(byte[] buf, int off, int len) throws IOException {
>       synchronized(unwrappedRpcBuffer) {
>         // fill the buffer with the next RPC message
>         if (unwrappedRpcBuffer.remaining() == 0) {
>           readNextRpcPacket();
>         }
> {code}
> readNextRpcPacket() may assign another ByteBuffer to unwrappedRpcBuffer, making the lock
on previous ByteBuffer not useful.



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