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Hudson commented on HDFS-7270: ------------------------------ SUCCESS: Integrated in Hadoop-trunk-Commit #7024 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/7024/]) 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/DFSOutputStream.java * hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.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/server/datanode/DataNode.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 > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)