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 file 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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