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From e..@apache.org
Subject svn commit: r1148894 - in /hadoop/common/trunk/hdfs: CHANGES.txt src/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java
Date Wed, 20 Jul 2011 18:53:00 GMT
Author: eli
Date: Wed Jul 20 18:52:57 2011
New Revision: 1148894

URL: http://svn.apache.org/viewvc?rev=1148894&view=rev
Log:
HDFS-1774. Small optimization to FSDataset. Contributed by Uma Maheswara Rao G

Modified:
    hadoop/common/trunk/hdfs/CHANGES.txt
    hadoop/common/trunk/hdfs/src/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java

Modified: hadoop/common/trunk/hdfs/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/hdfs/CHANGES.txt?rev=1148894&r1=1148893&r2=1148894&view=diff
==============================================================================
--- hadoop/common/trunk/hdfs/CHANGES.txt (original)
+++ hadoop/common/trunk/hdfs/CHANGES.txt Wed Jul 20 18:52:57 2011
@@ -579,6 +579,8 @@ Trunk (unreleased changes)
     and Random object creation to DFSUtil; move DFSClient.stringifyToken(..)
     to DelegationTokenIdentifier.  (szetszwo)
 
+    HDFS-1774. Small optimization to FSDataset. (Uma Maheswara Rao G via eli)
+    
   OPTIMIZATIONS
 
     HDFS-1458. Improve checkpoint performance by avoiding unnecessary image

Modified: hadoop/common/trunk/hdfs/src/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/hdfs/src/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java?rev=1148894&r1=1148893&r2=1148894&view=diff
==============================================================================
--- hadoop/common/trunk/hdfs/src/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java
(original)
+++ hadoop/common/trunk/hdfs/src/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java
Wed Jul 20 18:52:57 2011
@@ -99,23 +99,16 @@ public class FSDataset implements FSCons
         }
       } else {
         File[] files = FileUtil.listFiles(dir); 
-        int numChildren = 0;
+        List<FSDir> dirList = new ArrayList<FSDir>();
         for (int idx = 0; idx < files.length; idx++) {
           if (files[idx].isDirectory()) {
-            numChildren++;
+            dirList.add(new FSDir(files[idx]));
           } else if (Block.isBlockFilename(files[idx])) {
             numBlocks++;
           }
         }
-        if (numChildren > 0) {
-          children = new FSDir[numChildren];
-          int curdir = 0;
-          for (int idx = 0; idx < files.length; idx++) {
-            if (files[idx].isDirectory()) {
-              children[curdir] = new FSDir(files[idx]);
-              curdir++;
-            }
-          }
+        if (dirList.size() > 0) {
+          children = dirList.toArray(new FSDir[dirList.size()]);
         }
       }
     }



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