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https://issues.apache.org/jira/browse/FLUME-2502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14173107#comment-14173107
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Hari Shreedharan commented on FLUME-2502:
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In java 6 and 7, Arrays.asList returns an ArrayList. You could simply check if
it is an instance of ArrayList and cast it. Else do what is currently being
done. It is a hack, but it can reduce one array copy - which can be really
expensive if the number of new files is huge.
> 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
> Attachments: FLUME-2502-0.patch, FLUME-2502-1.patch,
> FLUME-2502-2.patch
>
>
> 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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