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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5394) fix race conditions in DN caching and uncaching
Date Fri, 08 Nov 2013 11:04:50 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13817183#comment-13817183
] 

Hudson commented on HDFS-5394:
------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk #386 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/386/])
HDFS-5394: Fix race conditions in DN caching and uncaching (cmccabe) (cmccabe: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1539909)
* /hadoop/common/trunk/dev-support/test-patch.sh
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/nativeio/NativeIO.java
* /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/client/ClientMmap.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetCache.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/MappableBlock.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestFsDatasetCache.java


> fix race conditions in DN caching and uncaching
> -----------------------------------------------
>
>                 Key: HDFS-5394
>                 URL: https://issues.apache.org/jira/browse/HDFS-5394
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>    Affects Versions: 3.0.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 3.0.0
>
>         Attachments: HDFS-5394-caching.001.patch, HDFS-5394-caching.002.patch, HDFS-5394-caching.003.patch,
HDFS-5394-caching.004.patch, HDFS-5394.005.patch, HDFS-5394.006.patch, HDFS-5394.007.patch,
HDFS-5394.008.patch, HDFS-5394.009.patch
>
>
> The DN needs to handle situations where it is asked to cache the same replica more than
once.  (Currently, it can actually do two mmaps and mlocks.)  It also needs to handle the
situation where caching a replica is cancelled before said caching completes.



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