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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-13616) Batch listing of multiple directories
Date Thu, 24 May 2018 18:11:00 GMT
Andrew Wang created HDFS-13616:

             Summary: 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

One of the dominant workloads for external metadata services is listing of partition directories.
This canĀ 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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