We found a issue of forceSplit.
1. My schema:
We have a table with multiple column families: A, B, C, D
After put many data, but there may be no data (no storeFile) for some
stores.
for example: store A and B is empty, but C and D have many data now.
2. Then I request a split from hbase shell or the web GUI, but nothing
happend.
3. Then we check the code, it may be a bug for multiple CFs.
(1) split request.
RegionServer: region.shouldSplit(true)
and enqueue this request
(2) HRegion.compactStores(false)
for (Store store: stores.values()) {
final Store.StoreSize ss = store.compact(majorCompaction);
lastCompactSize += store.getLastCompactSize();
if (ss != null && ss.getSize() > maxSize) {
maxSize = ss.getSize();
splitRow = ss.getSplitRow();
}
}
but, for store A and store B, store.compact(false) returns null.
(3) Store.compact(false)
boolean forceSplit = this.region.shouldSplit(false);
for the first store A and second store B, it set
this.splitRequest=false. This is a bug.
(4) Then even for store C and D which have many data, forceSplit is
always false.
btw: seems the current code of compaction/spliting is so disordered and
confused.
Schubert
