HDFS-13550.TestDebugAdmin#testComputeMetaCommand fails on Windows. Contributed by Anbang Hu.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DebugAdmin.java

@@ -97,15 +97,17 @@ public class DebugAdmin extends Configured implements Tool {
     VerifyMetaCommand() {
       super("verifyMeta",
 "verifyMeta -meta <metadata-file> [-block <block-file>]",
-"  Verify HDFS metadata and block files.  If a block file is specified, we\n" +
-"  will verify that the checksums in the metadata file match the block\n" +
+"  Verify HDFS metadata and block files.  If a block file is specified, we" +
+    System.lineSeparator() +
+"  will verify that the checksums in the metadata file match the block" +
+    System.lineSeparator() +
 "  file.");
     }
 
     int run(List<String> args) throws IOException {
       if (args.size() == 0) {
         System.out.println(usageText);
-        System.out.println(helpText + "\n");
+        System.out.println(helpText + System.lineSeparator());
         return 1;
       }
       String blockFile = StringUtils.popOptionWithArgument("-block", args);
@@ -212,10 +214,15 @@ public class DebugAdmin extends Configured implements Tool {
       super("computeMeta",
           "computeMeta -block <block-file> -out <output-metadata-file>",
           "  Compute HDFS metadata from the specified block file, and save it"
-              + " to\n  the specified output metadata file.\n\n"
-              + "**NOTE: Use at your own risk!\n If the block file is corrupt"
-              + " and you overwrite it's meta file, \n it will show up"
-              + " as good in HDFS, but you can't read the data.\n"
+              + " to" + System.lineSeparator()
+              + "  the specified output metadata file."
+              + System.lineSeparator() + System.lineSeparator()
+              + "**NOTE: Use at your own risk!" + System.lineSeparator()
+              + " If the block file is corrupt"
+              + " and you overwrite it's meta file, " + System.lineSeparator()
+              + " it will show up"
+              + " as good in HDFS, but you can't read the data."
+              + System.lineSeparator()
               + " Only use as a last measure, and when you are 100% certain"
               + " the block file is good.");
     }
@@ -234,7 +241,7 @@ public class DebugAdmin extends Configured implements Tool {
     int run(List<String> args) throws IOException {
       if (args.size() == 0) {
         System.out.println(usageText);
-        System.out.println(helpText + "\n");
+        System.out.println(helpText + System.lineSeparator());
         return 1;
       }
       final String name = StringUtils.popOptionWithArgument("-block", args);
@@ -291,7 +298,8 @@ public class DebugAdmin extends Configured implements Tool {
     RecoverLeaseCommand() {
       super("recoverLease",
 "recoverLease -path <path> [-retries <num-retries>]",
-"  Recover the lease on the specified path.  The path must reside on an\n" +
+"  Recover the lease on the specified path.  The path must reside on an" +
+    System.lineSeparator() +
 "  HDFS filesystem.  The default number of retries is 1.");
     }
 
@@ -300,7 +308,7 @@ public class DebugAdmin extends Configured implements Tool {
     int run(List<String> args) throws IOException {
       if (args.size() == 0) {
         System.out.println(usageText);
-        System.out.println(helpText + "\n");
+        System.out.println(helpText + System.lineSeparator());
         return 1;
       }
       String pathStr = StringUtils.popOptionWithArgument("-path", args);
@@ -395,7 +403,7 @@ public class DebugAdmin extends Configured implements Tool {
         return 0;
       }
       System.out.println(command.usageText);
-      System.out.println(command.helpText + "\n");
+      System.out.println(command.helpText + System.lineSeparator());
       return 0;
     }
   }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestDebugAdmin.java

@@ -87,7 +87,7 @@ public class TestDebugAdmin {
       IOUtils.closeStream(out);
     }
     return "ret: " + ret + ", " +
-        bytes.toString().replaceAll(System.getProperty("line.separator"), "");
+        bytes.toString().replaceAll(System.lineSeparator(), "");
   }
 
   @Test(timeout = 60000)