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From "Jitendra Nath Pandey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15471) Hdfs recursive listing operation is very slow
Date Fri, 08 Jun 2018 23:26:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16506689#comment-16506689

Jitendra Nath Pandey commented on HADOOP-15471:

[~ajaysachdev], please review the javac/findbugs issues and test failures. Please fix them
if they are related to this patch.

> Hdfs recursive listing operation is very slow
> ---------------------------------------------
>                 Key: HADOOP-15471
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15471
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 2.7.1
>         Environment: HCFS file system where HDP 2.6.1 is connected to ECS (Object Store).
>            Reporter: Ajay Sachdev
>            Assignee: Ajay Sachdev
>            Priority: Major
>             Fix For: 2.7.1
>         Attachments: HDFS-13398.001.patch, HDFS-13398.002.patch, HDFS-13398.003.patch,
> The hdfs dfs -ls -R command is sequential in nature and is very slow for a HCFS system.
We have seen around 6 mins for 40K directory/files structure.
> The proposal is to use multithreading approach to speed up recursive list, du and count
> We have tried a ForkJoinPool implementation to improve performance for recursive listing
> [https://github.com/jasoncwik/hadoop-release/tree/parallel-fs-cli]
> commit id : 
> 82387c8cd76c2e2761bd7f651122f83d45ae8876
> Another implementation is to use Java Executor Service to improve performance to run
listing operation in multiple threads in parallel. This has significantly reduced the time
to 40 secs from 6 mins.

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