[GitHub] [hadoop] virajjasani commented on a change in pull request #3928: HDFS-16438. Avoid holding read locks for a long time when scanDatanodeStorage

[GitBox <gi...@apache.org>]

virajjasani commented on a change in pull request #3928:
URL: https://github.com/apache/hadoop/pull/3928#discussion_r793739272



##########
File path: hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.java
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@@ -665,6 +672,16 @@ private void scanDatanodeStorage(DatanodeDescriptor dn,
             blockList.put(b, null);
           }
           numBlocksChecked++;
+          if (Time.monotonicNow() - beginTime > scanDatanodeStorageLockTimeMs) {
+            namesystem.readUnlock();
+            try {
+              Thread.sleep(1);

Review comment:
       Is 1ms sleep time enough to remove lock starvation or we should add bit more?




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