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From "Ivan Bella (JIRA)" <>
Subject [jira] [Created] (ACCUMULO-4643) Allow iterators to interrupt themselves
Date Thu, 25 May 2017 16:45:04 GMT
Ivan Bella created ACCUMULO-4643:

             Summary: Allow iterators to interrupt themselves
                 Key: ACCUMULO-4643
             Project: Accumulo
          Issue Type: Improvement
          Components: tserver
    Affects Versions: 1.8.1, 2.0.0
            Reporter: Ivan Bella
            Assignee: Ivan Bella
             Fix For: 2.0.0

The idea here is to allow an iterator stack to send back a special key or throw a special
exception which will allow the tablet server to tear down the scan to be rebuilt later.  This
is to handle the case where an iterator is doing a lot of work without returning results to
avoid starving out other scans.

There are two thoughts on how to do this:
1) A special "interrupt" key is returned from the getTopKey call that is detected in the Tablet.nextBatch
call, is not added to the results, but is used to add an unfinished range and results in the
remaining ranges to be deemed unfinished.
2) An special exception is thrown from the next or seek call that included the key of the
current position, and the same actions are taken as in 1).

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