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Posted to hdfs-dev@hadoop.apache.org by "Vinayakumar B (JIRA)" <ji...@apache.org> on 2014/10/08 11:48:33 UTC
[jira] [Created] (HDFS-7210) Avoid two separate RPC's
namenode.append() and namenode.getFileInfo() for an append call from
DFSClient
Vinayakumar B created HDFS-7210:
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Summary: 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
Reporter: Vinayakumar B
Assignee: Vinayakumar B
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, need to add one more. similar to {{rename2}}
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