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https://issues.apache.org/jira/browse/HBASE-1831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12758939#action_12758939
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Jonathan Gray commented on HBASE-1831:
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I agree that this is not going to be easy. Still think that filters should not
be run client-side (even if they are, it will require additional/new
information to be sent from client to server).
Running an offset of 1000 rows client-side completely negates the value in
using filters in the first place... to not have to send back all that data.
That's the reason client-side filters don't really work, they require you to
send back otherwise filtered-out data.
What I would like to see as a long-term solution to this:
1st: Add ability for server to say STOP and not go to next region
2nd: Correctness for stateful scanners under non-split, non-failure scenarios
(less correctness / fail-fast if encountering issues)
3rd: Correctness/robustness for stateful scanners under splits and failures
> Scanning API must be reworked to allow for fully functional Filters
> client-side
> -------------------------------------------------------------------------------
>
> Key: HBASE-1831
> URL: https://issues.apache.org/jira/browse/HBASE-1831
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: Jonathan Gray
> Priority: Critical
> Fix For: 0.20.1, 0.21.0
>
> Attachments: 1831.patch
>
>
> Right now, a client replays part of the Filter locally by calling
> filterRowKey() and filterAllRemaining() to determine whether it should
> continue to the next region.
> A number of new filters rely on filterKeyValue() and other calls to alter
> state. It's also a false assumption that all rows/keys affecting a filter
> returning true for FAR will be seen client-side (what about those that failed
> the filter).
> This issue is about dealing with Filters properly from the client-side.
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