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https://issues.apache.org/jira/browse/HBASE-12077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14145980#comment-14145980
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Lars Hofhansl edited comment on HBASE-12077 at 9/24/14 7:20 AM:
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Confirmed in a run with Phoenix that this brings down the creation of Itr
objects by 90% during certain scans that happen to create a FilterList.
[~giacomotaylor], [~apurtell]
was (Author: lhofhansl):
Confirmed in a run with Phoenix that this brings down the creation of Itr
objects by 90% during certain scans that happen to create a FilteredList.
[~giacomotaylor], [~apurtell]
> FilterLists create many ArrayList$Itr objects per row.
> ------------------------------------------------------
>
> Key: HBASE-12077
> URL: https://issues.apache.org/jira/browse/HBASE-12077
> Project: HBase
> Issue Type: Sub-task
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 2.0.0, 0.98.7, 0.94.24, 0.99.1
>
> Attachments: 12077-0.98.txt, HBASE-12077.patch
>
>
> Almost all methods in FilterList do work on behalf of the passed list of
> filters, which - you guessed it - is always an ArrayList and we always
> iterate over those with an iterator. Multiple of these methods are called for
> each row leading to creating about 10 Itrs for every single row touched
> (whether filtered or not)
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