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https://issues.apache.org/jira/browse/HDFS-4489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13643839#comment-13643839
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Suresh Srinivas commented on HDFS-4489:
---------------------------------------
I made changes to the code to reuse the byte[][] pathComponents for file
creation (made some optimizations in that method. There are other optimizations
available in terms of permission checks that I did not venture to do). The
throughput with those partial optimizations is:
||Opertaions||Elapsed||OpsPerSec||AvgTime||
|100000| 19591| 5104.384666428462| 19|
|100000| 18969| 5271.759186040382| 18|
|100000| 19206| 5206.706237634073| 19|
|100000| 18652| 5361.35535063264| 18|
|100000| 19218| 5203.455094182537| 19|
|100000| 19179| 5214.036185411127| 19|
|100000| 19302| 5180.810278727593| 19|
|100000| 19388| 5157.829585310501| 19|
|100000| 19099| 5235.876223886067| 19|
|100000| 19591| 5104.384666428462| 19|
|Average|19219.5|5204.059747|18.8|
> Use InodeID as as an identifier of a file in HDFS protocols and APIs
> --------------------------------------------------------------------
>
> Key: HDFS-4489
> URL: https://issues.apache.org/jira/browse/HDFS-4489
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Brandon Li
> Assignee: Brandon Li
> Fix For: 2.0.5-beta
>
>
> The benefit of using InodeID to uniquely identify a file can be multiple
> folds. Here are a few of them:
> 1. uniquely identify a file cross rename, related JIRAs include HDFS-4258,
> HDFS-4437.
> 2. modification checks in tools like distcp. Since a file could have been
> replaced or renamed to, the file name and size combination is no t reliable,
> but the combination of file id and size is unique.
> 3. id based protocol support (e.g., NFS)
> 4. to make the pluggable block placement policy use fileid instead of
> filename (HDFS-385).
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