James Taylor created PHOENIX-1278:
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Summary: Performance degradation for salted tables with guideposts
Key: PHOENIX-1278
URL: https://issues.apache.org/jira/browse/PHOENIX-1278
Project: Phoenix
Issue Type: Bug
Reporter: James Taylor
When a table is salted, we're seeing a degradation in performance using our new
guidepost-based parallelization. With salted tables, we do a merge sort with
the results from all the parallel scans. I suspect the cause here is that we're
doing a merge sort now between more chunks than before (since we chunk
everything up more now than we used to). We should group the scans we're doing
for the same bucket together and do a concat with those results and then do a
merge sort only with the concatenated batches.
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