svn commit: r706796 - in /hadoop/core/trunk: CHANGES.txt src/hdfs/org/apache/hadoop/hdfs/DFSClient.java

[hairong]

Author: hairong
Date: Tue Oct 21 15:12:57 2008
New Revision: 706796

URL: http://svn.apache.org/viewvc?rev=706796&view=rev
Log:
HADOOP-3914. DFSClient sends Checksum Ok only once for a block. Contributed by 
Chritian Kunz and Hairong Kuang.

Modified:
    hadoop/core/trunk/CHANGES.txt
    hadoop/core/trunk/src/hdfs/org/apache/hadoop/hdfs/DFSClient.java

Modified: hadoop/core/trunk/CHANGES.txt
URL: 
http://svn.apache.org/viewvc/hadoop/core/trunk/CHANGES.txt?rev=706796&r1=706795&r2=706796&view=diff
==============================================================================
--- hadoop/core/trunk/CHANGES.txt (original)
+++ hadoop/core/trunk/CHANGES.txt Tue Oct 21 15:12:57 2008
@@ -1046,6 +1046,9 @@
 
     HADOOP-4469. Rename and add the ant task jar file to the tar file. (nigel)
 
+    HADOOP-3914. DFSClient sends Checksum Ok only once for a block. 
+    (Christain Kunz via hairong)
+ 
 Release 0.18.1 - 2008-09-17
 
   IMPROVEMENTS

Modified: hadoop/core/trunk/src/hdfs/org/apache/hadoop/hdfs/DFSClient.java
URL: 
http://svn.apache.org/viewvc/hadoop/core/trunk/src/hdfs/org/apache/hadoop/hdfs/DFSClient.java?rev=706796&r1=706795&r2=706796&view=diff
==============================================================================
--- hadoop/core/trunk/src/hdfs/org/apache/hadoop/hdfs/DFSClient.java (original)
+++ hadoop/core/trunk/src/hdfs/org/apache/hadoop/hdfs/DFSClient.java Tue Oct 21 
15:12:57 2008
@@ -1024,6 +1024,7 @@
     private int bytesPerChecksum;
     private int checksumSize;
     private boolean gotEOS = false;
+    private boolean sentChecksumOk = false;
     
     byte[] skipBuf = null;
     ByteBuffer checksumBytes = null;
@@ -1058,8 +1059,15 @@
       
       int nRead = super.read(buf, off, len);
       if (nRead >= 0 && gotEOS && needChecksum()) {
-        //checksum is verified and there are no errors.
-        checksumOk(dnSock);
+        if (sentChecksumOk) {
+           // this should not happen; log the error for the debugging purpose
+           LOG.info(StringUtils.stringifyException(new IOException(
+             "Checksum ok was sent and should not be sent again")));  
+        } else {
+          //checksum is verified and there are no errors.
+          checksumOk(dnSock);
+          sentChecksumOk = true;
+       }
       }
       return nRead;
     }