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Posted to hdfs-issues@hadoop.apache.org by "Andrew Wang (JIRA)" <ji...@apache.org> on 2018/05/24 18:15:00 UTC
[jira] [Commented] (HDFS-13616) Batch listing of multiple
directories
[ https://issues.apache.org/jira/browse/HDFS-13616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16489518#comment-16489518 ]
Andrew Wang commented on HDFS-13616:
------------------------------------
Patch attached to get some initial feedback on the API and a precommit run on the patch.
I can add a naive default FileSystem implementation if desired, I don't have any other immediate TODOs in mind.
> Batch listing of multiple directories
> -------------------------------------
>
> Key: HDFS-13616
> URL: https://issues.apache.org/jira/browse/HDFS-13616
> Project: Hadoop HDFS
> Issue Type: New Feature
> Affects Versions: 3.2.0
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Priority: Major
> Attachments: HDFS-13616.001.patch
>
>
> One of the dominant workloads for external metadata services is listing of partition directories. This can end up being bottlenecked on RTT time when partition directories contain a small number of files. This is fairly common, since fine-grained partitioning is used for partition pruning by the query engines.
> A batched listing API that takes multiple paths amortizes the RTT cost. Initial benchmarks show a 10-20x improvement in metadata loading performance.
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