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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4595) When short circuit read is disallowed, DFSClient does disable short circuit and fall back to regular reads
Date Wed, 13 Mar 2013 05:18:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600835#comment-13600835
] 

Suresh Srinivas commented on HDFS-4595:
---------------------------------------

javac warnings are related to deprecation:
{noformat}
438a439,442
> [WARNING] /home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestShortCircuitLocalRead.java:[103,17]
[deprecation] getClient() in org.apache.hadoop.hdfs.DistributedFileSystem has been deprecated
> [WARNING] /home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestShortCircuitLocalRead.java:[132,20]
[deprecation] getClient() in org.apache.hadoop.hdfs.DistributedFileSystem has been deprecated
> [WARNING] /home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestShortCircuitLocalRead.java:[152,17]
[deprecation] getClient() in org.apache.hadoop.hdfs.DistributedFileSystem has been deprecated
> [WARNING] /home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestShortCircuitLocalRead.java:[185,20]
[deprecation] getClient() in org.apache.hadoop.hdfs.DistributedFileSystem has been deprecated
{noformat}

I am going to remove deprecation and mark it as @VisibleForTesting


                
> When short circuit read is disallowed, DFSClient does disable short circuit and fall
back to regular reads
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4595
>                 URL: https://issues.apache.org/jira/browse/HDFS-4595
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.0.0-alpha
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>         Attachments: HDFS-4595.patch, HDFS-4595.patch, HDFS-4595.patch
>
>
> In 1.0, when short circuit is disallowed for a user, the DFSClient disables short circuit
and falls back to the regular socket based reads over DataTransferProtocol. In release 2.0,
this fallback functionality is not working.

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