huaxiangsun commented on a change in pull request #1922:
URL: https://github.com/apache/hbase/pull/1922#discussion_r442371151
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File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/SimpleRegionNormalizer.java
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@@ -369,7 +369,8 @@ private boolean skipForMerge(final RegionStates
regionStates, final RegionInfo r
}
final long currentSizeMb = getRegionSizeMB(current);
final long nextSizeMb = getRegionSizeMB(next);
- if (currentSizeMb + nextSizeMb < avgRegionSizeMb) {
+ // always merge away empty regions when they present themselves.
+ if (currentSizeMb == 0 || nextSizeMb == 0 || currentSizeMb + nextSizeMb
< avgRegionSizeMb) {
Review comment:
There is a special case for size to be 0, wondering if the region size
is very small but nonzero, and there is a large size neighbor region, can we do
something about it?
100 1 100 (avg size is 20), in this case, 1 wont be merged as well. What
if some logic like
'''currentSizeMb < 0.1 * avgRegionSizeMb and currentSizeMb/nextSizeMb < 0.1
(switch currentSizeMb and nextSizeMb as well), then merge'''
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