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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7210) Avoid two separate RPC's namenode.append() and namenode.getFileInfo() for an append call from DFSClient
Date Fri, 28 Nov 2014 15:54:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14228346#comment-14228346
] 

Hudson commented on HDFS-7210:
------------------------------

SUCCESS: Integrated in Hadoop-trunk-Commit #6615 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/6615/])
HDFS-7210. Avoid two separate RPC's namenode.append() and namenode.getFileInfo() for an append
call from DFSClient. (Vinayakumar B via umamahesh) (umamahesh: rev 1556f86a31a54733d6550363aa0e027acca7823b)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolTranslatorPB.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolServerSideTranslatorPB.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestRetryCacheWithHA.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/LastBlockWithStatus.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNamenodeRetryCache.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientNamenodeProtocol.proto
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientProtocol.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogLoader.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt


> Avoid two separate RPC's namenode.append() and namenode.getFileInfo() for an append call
from DFSClient
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-7210
>                 URL: https://issues.apache.org/jira/browse/HDFS-7210
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client, namenode
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>         Attachments: HDFS-7210-001.patch, HDFS-7210-002.patch, HDFS-7210-003.patch, HDFS-7210-004.patch,
HDFS-7210-005.patch, HDFS-7210-006.patch
>
>
> Currently DFSClient does 2 RPCs to namenode for an append operation.
> {{append()}} for re-opening the file and getting the last block, 
> {{getFileInfo()}} Another on to get HdfsFileState
> If we can combine result of these 2 calls and make one RPC, then it can reduce load on
NameNode.
> For the backward compatibility we need to keep existing {{append()}} call as is



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