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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7270) Add congestion signaling capability to DataNode write protocol
Date Fri, 06 Feb 2015 11:36:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14309015#comment-14309015
] 

Hudson commented on HDFS-7270:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #830 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/830/])
HDFS-7270. Add congestion signaling capability to DataNode write protocol. Contributed by
Haohui Mai. (wheat9: rev c4980a2f343778544ca20ebea1338651793ea0d9)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDataTransferProtocol.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/proto/datatransfer.proto
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockReceiver.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/PipelineAck.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java


> Add congestion signaling capability to DataNode write protocol
> --------------------------------------------------------------
>
>                 Key: HDFS-7270
>                 URL: https://issues.apache.org/jira/browse/HDFS-7270
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Haohui Mai
>            Assignee: Haohui Mai
>         Attachments: HDFS-7270.000.patch, HDFS-7270.001.patch, HDFS-7270.002.patch, HDFS-7270.003.patch,
HDFS-7270.004.patch
>
>
> When a client writes to HDFS faster than the disk bandwidth of the DNs, it  saturates
the disk bandwidth and put the DNs unresponsive. The client only backs off by aborting / recovering
the pipeline, which leads to failed writes and unnecessary pipeline recovery.
> This jira proposes to add explicit congestion control mechanisms in the writing pipeline.




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