[GitHub] [hadoop] cxzl25 commented on a diff in pull request #4139: HDFS-16524. Add configuration to control blocks deletion asynchronous…

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

cxzl25 commented on code in PR #4139:
URL: https://github.com/apache/hadoop/pull/4139#discussion_r937786349


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hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java:
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@@ -3403,6 +3399,33 @@ FSPermissionChecker getPermissionChecker()
     return dir.getPermissionChecker();
   }
 
+  /**
+   * If blockDeletionAsync enables, blocks will be deleted asynchronously.
+   * If not, incrementally remove the blocks from blockManager
+   * Writelock is dropped and reacquired every BLOCK_DELETION_INCREMENT to
+   * ensure that other waiters on the lock can get in. See HDFS-2938
+   *
+   * @param toDeleteList
+   *          a list of blocks that need to be removed from blocksMap
+   */
+  void removeBlocks(List<BlockInfo> toDeleteList) {
+    if (this.blockDeletionAsync) {

Review Comment:
   The variable blockDeletionAsync doesn't seem to be declared.



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