HDFS-16798. HDFS-16798. SerialNumberMap should decrease current counter if the item exist. (#4987). Contributed by ZanderXu.

Signed-off-by: He Xiaoqiao <hexiaoqiao@apache.org>
2022-10-09 18:58:09 +08:00 · 2022-10-09 18:58:09 +08:00 · b0bfd09c41
parent 5eddec8c46
commit b0bfd09c41
1 changed files with 1 additions and 0 deletions
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SerialNumberMap.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SerialNumberMap.java
@ -68,6 +68,7 @@ public class SerialNumberMap<T> {
      }
      Integer old = t2i.putIfAbsent(t, sn);
      if (old != null) {
+        current.getAndDecrement();
        return old;
      }
      i2t.put(sn, t);