Ajay Sachdev created HDFS-13398:
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Summary: Hdfs recursive listing operation is very slow
Key: HDFS-13398
URL: https://issues.apache.org/jira/browse/HDFS-13398
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs
Affects Versions: 2.7.1
Environment: HCFS file system where HDP 2.6.1 is connected to ECS
(Object Store).
Reporter: Ajay Sachdev
Fix For: 2.7.1
The hdfs dfs -ls -R command is sequential in nature and is very slow for a HCFS
system. We have seen around 6 mins for 40K directory/files structure.
The proposal is to use multithreading approach to speed up recursive list, du
and count operations.
We have tried a ForkJoinPool implementation to improve performance for
recursive listing operation.
[https://github.com/jasoncwik/hadoop-release/tree/parallel-fs-cli]
commit id :
82387c8cd76c2e2761bd7f651122f83d45ae8876
Another implementation is to use Java Executor Service to improve performance
to run listing operation in multiple threads in parallel. This has
significantly reduced the time to 40 secs from 6 mins.
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