HBASE-27920 Skipping compact for this region if the table disable com…

…paction (#5273)

Signed-off-by: Duo Zhang <zhangduo@apache.org>
Signed-off-by: Wellington Chevreuil <wchevreuil@apache.org>
(cherry picked from commit d1f29d0)

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java

@@ -1956,7 +1956,9 @@ private static class CompactionChecker extends ScheduledChore {
     @Override
     protected void chore() {
       for (Region r : this.instance.onlineRegions.values()) {
-        if (r == null) {
+        // If region is read only or compaction is disabled at table level, there's no need to
+        // iterate through region's stores
+        if (r == null || r.isReadOnly() || !r.getTableDescriptor().isCompactionEnabled()) {
           continue;
         }
         HRegion hr = (HRegion) r;