Andrew Wang created HDFS-13616:
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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 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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