Added comments

Author: anmolasrani123

hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/AbfsConfiguration.java

@@ -143,8 +143,7 @@ public class AbfsConfiguration{
 
   @IntegerConfigurationValidatorAnnotation(ConfigurationKey = AZURE_MIN_BACKOFF_INTERVAL,
       DefaultValue = DEFAULT_MIN_BACKOFF_INTERVAL)
-  private int
-      minBackoffInterval;
+  private int minBackoffInterval;
 
   @IntegerConfigurationValidatorAnnotation(ConfigurationKey = AZURE_MAX_BACKOFF_INTERVAL,
       DefaultValue = DEFAULT_MAX_BACKOFF_INTERVAL)

hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/services/ITestAbfsInputStream.java

@@ -67,6 +67,10 @@ public void testWithNoOptimization() throws Exception {
     }
   }
 
+  /**
+   * These ranges should not be merged as difference in offsets is greater than 4 KB.
+   * @throws Throwable
+   */
   @Test
   public void testDisjointRangesWithVectoredRead() throws Throwable {
     int fileSize = ONE_MB;
@@ -90,6 +94,11 @@ public void testDisjointRangesWithVectoredRead() throws Throwable {
     }
   }
 
+  /**
+   * The last two ranges should get merged, so it covers the case of combinedFileRanges
+   * where there is a single underlying child and multiple as well.
+   * @throws Throwable
+   */
   @Test
   public void testMultipleDisjointRangesWithVectoredRead() throws Throwable {
     int fileSize = ONE_MB;
@@ -114,6 +123,10 @@ public void testMultipleDisjointRangesWithVectoredRead() throws Throwable {
     }
   }
 
+  /**
+   * Case which covers multiple disjoint ranges.
+   * @throws Throwable
+   */
   @Test
   public void testMultipleRangesWithVectoredRead() throws Throwable {
     int fileSize = ONE_MB;
@@ -139,6 +152,10 @@ public void testMultipleRangesWithVectoredRead() throws Throwable {
     }
   }
 
+  /**
+   * Case to verify two ranges with offset difference less than 4 KB will get merged.
+   * @throws Throwable
+   */
   @Test
   public void testMergedRangesWithVectoredRead() throws Throwable {
     int fileSize = ONE_MB;
@@ -162,6 +179,10 @@ public void testMergedRangesWithVectoredRead() throws Throwable {
     }
   }
 
+  /**
+   * Verify read ranges for a huge file.
+   * @throws Throwable
+   */
   @Test
   public void test_045_vectoredIOHugeFile() throws Throwable {
     int fileSize = 100 * ONE_MB;