Github user JamesRTaylor commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/8#discussion_r16694959
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/iterate/DefaultParallelIteratorRegionSplitter.java
---
@@ -138,14 +146,10 @@ public boolean apply(HRegionLocation location) {
// split each region in s splits such that:
// s = max(x) where s * x < t
//
- // The idea is to align splits with region boundaries. If rows are
not evenly
- // distributed across regions, using this scheme compensates for
regions that
- // have more rows than others, by applying tighter splits and
therefore spawning
- // off more scans over the overloaded regions.
- int splitsPerRegion = getSplitsPerRegion(regions.size());
// Create a multi-map of ServerName to List<KeyRange> which we'll
use to round robin from to ensure
// that we keep each region server busy for each query.
- ListMultimap<HRegionLocation,KeyRange> keyRangesPerRegion =
ArrayListMultimap.create(regions.size(),regions.size() * splitsPerRegion);;
+ int splitsPerRegion = getSplitsPerRegion(regions.size());
+ ListMultimap<HRegionLocation,KeyRange> keyRangesPerRegion =
ArrayListMultimap.create(regions.size(),regions.size() * splitsPerRegion);
--- End diff --
I forgot to mention this before, but it's important that we always use the
guide posts here to determine the set of work that will be done. We'll get rid
of the hint for not splitting up work. I'm not super keen on falling back to
using Bytes.split(), but not sure what a better alternative would be. I suppose
when a table is initially created this will be the case for a while. We should
at a minimum log a warning if we fallback to this. Any ideas here?
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