MAPREDUCE-782. Use PureJavaCrc32 in mapreduce spills. (Todd Lipcon, backport by Brandon Li via sseth)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1366280 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -51,6 +51,8 @@ Release 1.2.0 - unreleased
 
     HDFS-496. Backport: Use PureJavaCrc32 in HDFS.  (Brandon Li via szetszwo)
 
+    MAPREDUCE-782. Use PureJavaCrc32 in mapreduce spills. (Todd Lipcon, backport by Brandon Li via sseth)
+
   OPTIMIZATIONS
 
     HDFS-2533. Backport: Remove needless synchronization on some FSDataSet

src/mapred/org/apache/hadoop/mapred/SpillRecord.java

@@ -22,7 +22,6 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.nio.LongBuffer;
-import java.util.zip.CRC32;
 import java.util.zip.CheckedInputStream;
 import java.util.zip.CheckedOutputStream;
 import java.util.zip.Checksum;
@@ -33,6 +32,7 @@ import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.io.SecureIOUtils;
+import org.apache.hadoop.util.PureJavaCrc32;
 
 import static org.apache.hadoop.mapred.MapTask.MAP_OUTPUT_INDEX_RECORD_LENGTH;
 
@@ -51,7 +51,7 @@ class SpillRecord {
 
   public SpillRecord(Path indexFileName, JobConf job, String expectedIndexOwner)
   throws IOException {
-    this(indexFileName, job, new CRC32(), expectedIndexOwner);
+    this(indexFileName, job, new PureJavaCrc32(), expectedIndexOwner);
   }
 
   public SpillRecord(Path indexFileName, JobConf job, Checksum crc, 
@@ -115,7 +115,7 @@ class SpillRecord {
    */
   public void writeToFile(Path loc, JobConf job)
       throws IOException {
-    writeToFile(loc, job, new CRC32());
+    writeToFile(loc, job, new PureJavaCrc32());
   }
 
   public void writeToFile(Path loc, JobConf job, Checksum crc)