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https://issues.apache.org/jira/browse/HDFS-13616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16493863#comment-16493863
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Todd Lipcon commented on HDFS-13616:
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bq. maybe getSourcePath? getListedPath?
Yea, I think getListedPath or getRequestedPath would be good. Should clarify in
the docs also whether the path returned there is guaranteed to be equal to the
path that was passed in, or whether it could have been canonicalized, etc. I
would hope that it's identical, since it makes "matching up" back to the
original requested paths much easier.
> 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: BenchmarkListFiles.java, HDFS-13616.001.patch,
> HDFS-13616.002.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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