Ivan Bella created ACCUMULO-4643:
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Summary: Allow iterators to interrupt themselves
Key: ACCUMULO-4643
URL: https://issues.apache.org/jira/browse/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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