[GitHub] [hive] ayushtkn commented on a change in pull request #3037: HIVE-25958: Optimise BasicStatsNoJobTask.

[GitBox <gi...@apache.org>]

ayushtkn commented on a change in pull request #3037:
URL: https://github.com/apache/hive/pull/3037#discussion_r812427536



##########
File path: ql/src/java/org/apache/hadoop/hive/ql/stats/BasicStatsNoJobTask.java
##########
@@ -446,4 +473,86 @@ private void shutdownAndAwaitTermination(ExecutorService threadPool) {
   @Override
   public void setDpPartSpecs(Collection<Partition> dpPartSpecs) {
   }
+
+  /**
+   * Utility class to process file level stats in parallel.
+   */
+  private static class FileStatProcessor implements Callable <FileStats> {
+
+    private final InputSplit dummySplit;
+    private final InputFormat<?, ?> inputFormat;
+    private final JobConf jc;
+    private final FileStatus file;
+
+    FileStatProcessor(FileStatus file, InputFormat<?, ?> inputFormat, InputSplit dummySplit, JobConf jc) {
+      this.file = file;
+      this.dummySplit = dummySplit;
+      this.inputFormat = inputFormat;
+      this.jc = jc;
+    }
+
+    @Override
+    public FileStats call() throws Exception {
+      try (org.apache.hadoop.mapred.RecordReader<?, ?> recordReader = inputFormat
+          .getRecordReader(dummySplit, jc, Reporter.NULL)) {
+        if (recordReader instanceof StatsProvidingRecordReader) {
+          StatsProvidingRecordReader statsRR;
+          statsRR = (StatsProvidingRecordReader) recordReader;
+          FileStats fileStats = new FileStats();
+          fileStats.setRawDataSize(statsRR.getStats().getRawDataSize());

Review comment:
       done along with others




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