charlesconnell opened a new pull request, #6901:
URL: https://github.com/apache/hbase/pull/6901
I've looked at a lot of allocation profiles of RegionServers doing a
read-heavy workload. Some allocations that dominate the chart can be easily
avoided. The method `StoreScanner#read()` contains this code
```
heap.recordBlockSize(blockSize -> {
if (rpcCall.isPresent()) {
rpcCall.get().incrementBlockBytesScanned(blockSize);
}
scannerContext.incrementBlockProgress(blockSize);
});
```
that runs for every iteration of its main loop. A closure can be created
before the loop and re-used instead.
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