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https://issues.apache.org/jira/browse/HDFS-3429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13553791#comment-13553791
]
Hudson commented on HDFS-3429:
------------------------------
Integrated in Hadoop-Mapreduce-trunk #1314 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1314/])
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)
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