Michael McCandless created LUCENE-6306:
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Summary: Merging of doc values, norms is not abortable
Key: LUCENE-6306
URL: https://issues.apache.org/jira/browse/LUCENE-6306
Project: Lucene - Core
Issue Type: Bug
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: 4.10.4
When you call IW.rollback, IW asks all running merges to abort, and the merges
should periodically check their abort flags (it's a "cooperative" mechanism,
like thread interrupting in Java).
In 5.x/trunk we have a nice clean solution where the Directory checks the abort
bit during writes, so the codec doesn't have to bother with this.
But in 4.x, we have to call MergeState.checkAbort.work, and I noticed that
neither DVs nor norms call this.
Typically this is not a problem since merging DVs and norms is usually fast,
but for a very large merge / very many DVs and norm'd fields, it could take
non-trivial time to merge.
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