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https://issues.apache.org/jira/browse/HDFS-13616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16489568#comment-16489568
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Andrew Wang commented on HDFS-13616:
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Thanks for providing the additional context Todd, agree on all points.
I'm happy to build a simple benchmark, let me start on that. I'm thinking of
invoking the NN methods directly, since external measurement seems a little
tricky, and I don't know how easy it is to hook in something like JMH. Getting
a realistic measurement would require doing something multi-threaded on a
server-class machine, but let's see how far I get on my laptop.
> 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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