Robert Muir created LUCENE-6131:
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Summary: optimize SortingMergePolicy
Key: LUCENE-6131
URL: https://issues.apache.org/jira/browse/LUCENE-6131
Project: Lucene - Core
Issue Type: Bug
Reporter: Robert Muir
This has a number of performance problems today:
# suboptimal stored fields merging. This is especially the case with high
compression. Today this is 7x-64x times slower than it should be.
# ram stacking: for any docvalues and norms fields, all instances will be
loaded in RAM. for any string docvalues fields, all instances of global
ordinals will be built, and none of this released until the whole merge is
complete.
We can fix these two problems without completely refactoring LeafReader... we
won't get a "bulk byte merge", checksum computation will still be suboptimal,
and its not a general solution to "merging with filterreaders" but that stuff
can be for another day.
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