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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4213) When the client calls hsync, allows the client to update the file length in the NameNode
Date Sat, 01 Dec 2012 14:06:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13507969#comment-13507969
] 

Hudson commented on HDFS-4213:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #1274 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1274/])
    HDFS-4213. Add an API to hsync for updating the last block length at the namenode. Contributed
by Jing Zhao (Revision 1415799)

     Result = SUCCESS
szetszwo : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1415799
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/DFSOutputStream.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/HdfsDataOutputStream.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientProtocol.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolServerSideTranslatorPB.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolTranslatorPB.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFileUnderConstruction.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientNamenodeProtocol.proto
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestHFlush.java

                
> When the client calls hsync, allows the client to update the file length in the NameNode
> ----------------------------------------------------------------------------------------
>
>                 Key: HDFS-4213
>                 URL: https://issues.apache.org/jira/browse/HDFS-4213
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: hdfs-client, namenode
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>             Fix For: 2.0.3-alpha
>
>         Attachments: HDFS-4213.001.patch, HDFS-4213.002.patch, HDFS-4213.003.patch, HDFS-4213.004.patch,
HDFS-4213.005.patch, HDFS-4213.006.patch, HDFS-4213.007.patch, HDFS-4213.008.patch
>
>
> As per discussion in HDFS-3960 and HDFS-2802, when clients that need strong consistency
update the file length at the NameNode, a special sync/flush is required for getting the length
of the being written files when snapshots are taken for these files. This jira implements
this sync-with-updating-length by 1) calling ClientProtocol#fsync(), and 2) adding a new field
to ClientProtocol#fsync() to indicate the length information.

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