HDFS-14617. Improve oiv tool to parse fsimage file in parallel with delimited format. (apache#2918). Contributed by Hongbing Wang.

Signed-off-by: He Xiaoqiao <hexiaoqiao@apache.org>

Author: Hexiaoqiao

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

@@ -107,6 +107,7 @@ public class OfflineImageViewerPB {
       + "                       Delimited outputs. If not set, the processor\n"
       + "                       constructs the namespace in memory \n"
       + "                       before outputting text.\n"
+      + "-m,--multiThread <arg> Use multiThread to process sub-sections.\n"
       + "-h,--help              Display usage information and exit\n";
 
   /**
@@ -132,6 +133,7 @@ private static Options buildOptions() {
     options.addOption("delimiter", true, "");
     options.addOption("sp", false, "");
     options.addOption("t", "temp", true, "");
+    options.addOption("m", "multiThread", true, "");
 
     return options;
   }
@@ -185,6 +187,7 @@ public static int run(String[] args) throws Exception {
     String delimiter = cmd.getOptionValue("delimiter",
         PBImageTextWriter.DEFAULT_DELIMITER);
     String tempPath = cmd.getOptionValue("t", "");
+    int threads = Integer.parseInt(cmd.getOptionValue("m", "1"));
 
     Configuration conf = new Configuration();
     PrintStream out = null;
@@ -227,15 +230,14 @@ public static int run(String[] args) throws Exception {
         boolean printStoragePolicy = cmd.hasOption("sp");
         try (PBImageDelimitedTextWriter writer =
             new PBImageDelimitedTextWriter(out, delimiter,
-                tempPath, printStoragePolicy);
-            RandomAccessFile r = new RandomAccessFile(inputFile, "r")) {
-          writer.visit(r);
+                tempPath, printStoragePolicy, threads, outputFile)) {
+          writer.visit(inputFile);
         }
         break;
       case "DETECTCORRUPTION":
         try (PBImageCorruptionDetector detector =
             new PBImageCorruptionDetector(out, delimiter, tempPath)) {
-          detector.visit(new RandomAccessFile(inputFile, "r"));
+          detector.visit(inputFile);
         }
         break;
       default:

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

@@ -337,7 +337,7 @@ public void afterOutput() throws IOException {
         if (parentId != -1) {
           entryBuilder.setParentId(parentId);
         }
-        printIfNotEmpty(entryBuilder.build());
+        printIfNotEmpty(serialOutStream(), entryBuilder.build());
       }
     }
   }

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

@@ -146,7 +146,13 @@ public String build() {
   PBImageDelimitedTextWriter(PrintStream out, String delimiter,
                              String tempPath, boolean printStoragePolicy)
       throws IOException {
-    super(out, delimiter, tempPath);
+    this(out, delimiter, tempPath, printStoragePolicy, 1, "-");
+  }
+
+  PBImageDelimitedTextWriter(PrintStream out, String delimiter,
+      String tempPath, boolean printStoragePolicy, int threads,
+      String parallelOut) throws IOException {
+    super(out, delimiter, tempPath, threads, parallelOut);
     this.printStoragePolicy = printStoragePolicy;
   }