From f75deca0f9dc3f2790be5e13fe376d33b3a08816 Mon Sep 17 00:00:00 2001
From: Eli Collins <eli@apache.org>
Date: Wed, 15 Aug 2012 22:43:01 +0000
Subject: [PATCH] HDFS-3048. Small race in BlockManager#close. Contributed by
 Andy Isaacson

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1373664 13f79535-47bb-0310-9956-ffa450edef68
---
 hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt       |  2 ++
 .../hdfs/server/blockmanagement/BlockManager.java | 15 +++++++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index ce3643fb34..94eb359bd7 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -614,6 +614,8 @@ Branch-2 ( Unreleased changes )
     header when offset is specified and length is omitted.
     (Ravi Prakash via szetszwo)
 
+    HDFS-3048. Small race in BlockManager#close. (Andy Isaacson via eli)
+
   BREAKDOWN OF HDFS-3042 SUBTASKS
 
     HDFS-2185. HDFS portion of ZK-based FailoverController (todd)
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
index 1d0afd7fa1..6e8130de86 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
@@ -373,10 +373,17 @@ public void activate(Configuration conf) {
   }
 
   public void close() {
-    if (pendingReplications != null) pendingReplications.stop();
-    blocksMap.close();
-    datanodeManager.close();
-    if (replicationThread != null) replicationThread.interrupt();
+    try {
+      if (replicationThread != null) {
+        replicationThread.interrupt();
+        replicationThread.join(3000);
+      }
+    } catch (InterruptedException ie) {
+    } finally {
+      if (pendingReplications != null) pendingReplications.stop();
+      blocksMap.close();
+      datanodeManager.close();
+    }
   }
 
   /** @return the datanodeManager */