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https://issues.apache.org/jira/browse/HDFS-3721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13432234#comment-13432234
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Hudson commented on HDFS-3721:
------------------------------
Integrated in Hadoop-Mapreduce-trunk-Commit #2589 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/2589/])
HDFS-3721. hsync support broke wire compatibility. Contributed by Todd
Lipcon and Aaron T. Myers. (Revision 1371495)
Result = FAILURE
atm : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1371495
Files :
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/RemoteBlockReader2.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/PacketHeader.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/PacketReceiver.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockReceiver.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockSender.java
> hsync support broke wire compatibility
> --------------------------------------
>
> Key: HDFS-3721
> URL: https://issues.apache.org/jira/browse/HDFS-3721
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node, hdfs client
> Affects Versions: 2.1.0-alpha
> Reporter: Todd Lipcon
> Assignee: Aaron T. Myers
> Priority: Critical
> Fix For: 2.2.0-alpha
>
> Attachments: hdfs-3721.txt, hdfs-3721.txt, hdfs-3721.txt
>
>
> HDFS-744 added support for hsync to the data transfer wire protocol. However,
> it actually broke wire compatibility: if the client has hsync support but the
> server does not, the client cannot read or write data on the old cluster.
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