[SPARK-17332][CORE] Make Java Loggers static members

## What changes were proposed in this pull request?

Make all Java Loggers static members

## How was this patch tested?

Jenkins

Author: Sean Owen <sowen@cloudera.com>

Closes #14896 from srowen/SPARK-17332.

6 files changed, 6 insertions, 6 deletions

diff --git a/core/src/main/java/org/apache/spark/memory/TaskMemoryManager.java b/core/src/main/java/org/apache/spark/memory/TaskMemoryManager.java
index 867c4a1050..1a700aa375 100644
--- a/core/src/main/java/org/apache/spark/memory/TaskMemoryManager.java
+++ b/core/src/main/java/org/apache/spark/memory/TaskMemoryManager.java
@@ -53,7 +53,7 @@ import org.apache.spark.util.Utils;
  */
 public class TaskMemoryManager {
 
-  private final Logger logger = LoggerFactory.getLogger(TaskMemoryManager.class);
+  private static final Logger logger = LoggerFactory.getLogger(TaskMemoryManager.class);
 
   /** The number of bits used to address the page table. */
   private static final int PAGE_NUMBER_BITS = 13;
diff --git a/core/src/main/java/org/apache/spark/shuffle/sort/BypassMergeSortShuffleWriter.java b/core/src/main/java/org/apache/spark/shuffle/sort/BypassMergeSortShuffleWriter.java
index 83dc61c5e5..cd6d64a1ee 100644
--- a/core/src/main/java/org/apache/spark/shuffle/sort/BypassMergeSortShuffleWriter.java
+++ b/core/src/main/java/org/apache/spark/shuffle/sort/BypassMergeSortShuffleWriter.java
@@ -73,7 +73,7 @@ import org.apache.spark.util.Utils;
  */
 final class BypassMergeSortShuffleWriter<K, V> extends ShuffleWriter<K, V> {
 
-  private final Logger logger = LoggerFactory.getLogger(BypassMergeSortShuffleWriter.class);
+  private static final Logger logger = LoggerFactory.getLogger(BypassMergeSortShuffleWriter.class);
 
   private final int fileBufferSize;
   private final boolean transferToEnabled;
diff --git a/core/src/main/java/org/apache/spark/shuffle/sort/ShuffleExternalSorter.java b/core/src/main/java/org/apache/spark/shuffle/sort/ShuffleExternalSorter.java
index cfec724fe9..c33d1e33f0 100644
--- a/core/src/main/java/org/apache/spark/shuffle/sort/ShuffleExternalSorter.java
+++ b/core/src/main/java/org/apache/spark/shuffle/sort/ShuffleExternalSorter.java
@@ -62,7 +62,7 @@ import org.apache.spark.util.Utils;
  */
 final class ShuffleExternalSorter extends MemoryConsumer {
 
-  private final Logger logger = LoggerFactory.getLogger(ShuffleExternalSorter.class);
+  private static final Logger logger = LoggerFactory.getLogger(ShuffleExternalSorter.class);
 
   @VisibleForTesting
   static final int DISK_WRITE_BUFFER_SIZE = 1024 * 1024;
diff --git a/core/src/main/java/org/apache/spark/shuffle/sort/UnsafeShuffleWriter.java b/core/src/main/java/org/apache/spark/shuffle/sort/UnsafeShuffleWriter.java
index 08fb887bbd..876cb7f7d8 100644
--- a/core/src/main/java/org/apache/spark/shuffle/sort/UnsafeShuffleWriter.java
+++ b/core/src/main/java/org/apache/spark/shuffle/sort/UnsafeShuffleWriter.java
@@ -56,7 +56,7 @@ import org.apache.spark.util.Utils;
 @Private
 public class UnsafeShuffleWriter<K, V> extends ShuffleWriter<K, V> {
 
-  private final Logger logger = LoggerFactory.getLogger(UnsafeShuffleWriter.class);
+  private static final Logger logger = LoggerFactory.getLogger(UnsafeShuffleWriter.class);
 
   private static final ClassTag<Object> OBJECT_CLASS_TAG = ClassTag$.MODULE$.Object();
 
diff --git a/core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java b/core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java
index dc04025692..e4289818f1 100644
--- a/core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java
+++ b/core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java
@@ -64,7 +64,7 @@ import org.apache.spark.util.collection.unsafe.sort.UnsafeSorterSpillWriter;
  */
 public final class BytesToBytesMap extends MemoryConsumer {
 
-  private final Logger logger = LoggerFactory.getLogger(BytesToBytesMap.class);
+  private static final Logger logger = LoggerFactory.getLogger(BytesToBytesMap.class);
 
   private static final HashMapGrowthStrategy growthStrategy = HashMapGrowthStrategy.DOUBLING;
 
diff --git a/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorter.java b/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorter.java
index 196e67d8b2..8ca29a58f8 100644
--- a/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorter.java
+++ b/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorter.java
@@ -44,7 +44,7 @@ import org.apache.spark.util.Utils;
  */
 public final class UnsafeExternalSorter extends MemoryConsumer {
 
-  private final Logger logger = LoggerFactory.getLogger(UnsafeExternalSorter.class);
+  private static final Logger logger = LoggerFactory.getLogger(UnsafeExternalSorter.class);
 
   @Nullable
   private final PrefixComparator prefixComparator;