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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1831) Scanning API must be reworked to allow for fully functional Filters client-side
Date Wed, 23 Sep 2009 19:33:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12758847#action_12758847
] 

stack commented on HBASE-1831:
------------------------------

On 3., above, carrying stateful filters across regions, it can't be done easily in 0.20.x
because we can get a NotServingRegionException at any time.  Also, if nothing goes wrong and
we just exhaust a scanner on a particular region, the last thing done over in RegionServer
is cleanup of scanner so a subsequent getFilter call would have nothing to pick up on once
it'd arrived at the RegionServer.  Statefulness has to be done client-side; filters need to
allow specifying a client-component.

> 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
>
>
> 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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