HDFS-12278. LeaseManager operations are inefficient in 2.8. Contributed by 
Rushabh S Shah.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/b5c02f95
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/b5c02f95
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/b5c02f95

Branch: refs/heads/HDFS-10467
Commit: b5c02f95b5a2fcb8931d4a86f8192caa18009ea9
Parents: ec69414
Author: Kihwal Lee <kih...@apache.org>
Authored: Wed Aug 9 16:46:05 2017 -0500
Committer: Kihwal Lee <kih...@apache.org>
Committed: Wed Aug 9 16:46:05 2017 -0500

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 .../hadoop/hdfs/server/namenode/LeaseManager.java | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/b5c02f95/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/LeaseManager.java
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diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/LeaseManager.java
 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/LeaseManager.java
index 6578ba9..35ec063 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/LeaseManager.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/LeaseManager.java
@@ -26,10 +26,11 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashSet;
 import java.util.List;
-import java.util.PriorityQueue;
+import java.util.NavigableSet;
 import java.util.Set;
 import java.util.SortedMap;
 import java.util.TreeMap;
+import java.util.TreeSet;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
@@ -87,11 +88,15 @@ public class LeaseManager {
   // Mapping: leaseHolder -> Lease
   private final SortedMap<String, Lease> leases = new TreeMap<>();
   // Set of: Lease
-  private final PriorityQueue<Lease> sortedLeases = new PriorityQueue<>(512,
+  private final NavigableSet<Lease> sortedLeases = new TreeSet<>(
       new Comparator<Lease>() {
         @Override
         public int compare(Lease o1, Lease o2) {
-          return Long.signum(o1.getLastUpdate() - o2.getLastUpdate());
+          if (o1.getLastUpdate() != o2.getLastUpdate()) {
+            return Long.signum(o1.getLastUpdate() - o2.getLastUpdate());
+          } else {
+            return o1.holder.compareTo(o2.holder);
+          }
         }
   });
   // INodeID -> Lease
@@ -528,9 +533,10 @@ public class LeaseManager {
 
     long start = monotonicNow();
 
-    while(!sortedLeases.isEmpty() && sortedLeases.peek().expiredHardLimit()
-      && !isMaxLockHoldToReleaseLease(start)) {
-      Lease leaseToCheck = sortedLeases.peek();
+    while(!sortedLeases.isEmpty() &&
+        sortedLeases.first().expiredHardLimit()
+        && !isMaxLockHoldToReleaseLease(start)) {
+      Lease leaseToCheck = sortedLeases.first();
       LOG.info(leaseToCheck + " has expired hard limit");
 
       final List<Long> removing = new ArrayList<>();


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