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https://issues.apache.org/jira/browse/FLUME-2502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14171302#comment-14171302
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Prateek Rungta commented on FLUME-2502:
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I found that by saving the directory listing across runs, I was able to get a
10x performance boost in the rate of consumption vs the `RANDOM` consume order.
Also, this rate of consumption was more stable as the directory size grows.
I've attached a patch with the changes in a new consume order: "BATCH".
> Spool source's directory listing is inefficient
> -----------------------------------------------
>
> Key: FLUME-2502
> URL: https://issues.apache.org/jira/browse/FLUME-2502
> Project: Flume
> Issue Type: Improvement
> Components: Sinks+Sources
> Affects Versions: v1.5.0
> Reporter: Prateek Rungta
>
> As mentioned in
> [FLUME-2309|https://issues.apache.org/jira/browse/FLUME-2309], the directory
> listing can it self become the bottleneck when accessing directories with a
> large number of files (>1M). The fix in that JIRA added in the ability to
> specify `RANDOM` as a Consume-Order to avoid sorting large lists.
> The slowness of the directory listing is still un-addressed.
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