Joseph295 commented on a change in pull request #1783:
URL: https://github.com/apache/hbase/pull/1783#discussion_r430881933
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File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
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@@ -695,6 +695,7 @@ void sawNoSuchFamily() {
private RegionCoprocessorHost coprocessorHost;
private TableDescriptor htableDescriptor = null;
+ private ThreadPoolExecutor storeFileOpenAndCloseThreadPool;
Review comment:
> Why is this shared at the Region level. Shouldn't it be at the Store
level (in HStore)?
>
> What does sharing at the region level gain us? Are you attempting to
evenly round-robin store open work over all opening stores in the region? Just
sharing an executor at region level won't do this. If the underlying stores are
skewed the order in which runnables are submitted to the executor will share
the skew.
If only one store is too slow and that is the bottleneck of the whole open
or close region process, it seems not easy to fix that by threadpool here(maybe
hedged read?). As Anoops said above, the problem we want to solve here is some
stores may have too many store files, while others have much fewer. It will be
quicker ideally if all of the store files just share the whole thread pool in
one region.
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