cuibo01 commented on a change in pull request #2889:
URL: https://github.com/apache/hbase/pull/2889#discussion_r562303540



##########
File path: 
hbase-server/src/main/java/org/apache/hadoop/hbase/master/ServerManager.java
##########
@@ -921,8 +921,10 @@ public boolean isClusterShutdown() {
   public void startChore() {
     Configuration c = master.getConfiguration();
     if (persistFlushedSequenceId) {
-      // when reach here, RegionStates should loaded, firstly, we call remove 
deleted regions
-      removeDeletedRegionFromLoadedFlushedSequenceIds();
+      new Thread(() -> {
+        // when reach here, RegionStates should loaded, firstly, we call 
remove deleted regions
+        removeDeletedRegionFromLoadedFlushedSequenceIds();
+      }, "RemoveDeletedRegionSyncThread").start();

Review comment:
       > Should this be a demon thread?
   no need, hmaster won't need the thread when it's done...
   > And seems that removeDeletedRegionFromLoadedFlushedSequenceIds could be a 
part of FlushedSequenceIdFlusher?
   no, removeDeletedRegionFromLoadedFlushedSequenceIds takes a long time and is 
disposable. if in FlushedSequenceIdFlusher, FlushedSequenceIdFlusher takes up 
choreService for a long time...Other tasks of choreService 
    cannot be executed.
   




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