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Hudson commented on HDFS-3429: ------------------------------ Integrated in Hadoop-Hdfs-trunk #1286 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1286/]) HDFS-3429. DataNode reads checksums even if client does not need them. Contributed by Todd Lipcon. (Revision 1433117) Result = FAILURE todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1433117 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/RemoteBlockReader.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/DataTransferProtocol.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/Receiver.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/Sender.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolSliceScanner.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockSender.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataXceiver.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/datatransfer.proto * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDataTransferProtocol.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestParallelRead.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestParallelReadUtil.java * /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestPread.java > DataNode reads checksums even if client does not need them > ---------------------------------------------------------- > > Key: HDFS-3429 > URL: https://issues.apache.org/jira/browse/HDFS-3429 > Project: Hadoop HDFS > Issue Type: Bug > Components: datanode, performance > Affects Versions: 2.0.0-alpha > Reporter: Todd Lipcon > Assignee: Todd Lipcon > Fix For: 3.0.0, 2.0.3-alpha > > Attachments: hdfs-3429-0.20.2.patch, hdfs-3429-0.20.2.patch, > hdfs-3429.txt, hdfs-3429.txt, hdfs-3429.txt, hdfs-3429.txt > > > Currently, even if the client does not want to verify checksums, the datanode > reads them anyway and sends them over the wire. This means that performance > improvements like HBase's application-level checksums don't have much benefit > when reading through the datanode, since the DN is still causing seeks into > the checksum file. > (Credit goes to Dhruba for discovering this - filing on his behalf) -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira