[GitHub] [hadoop] steveloughran commented on a change in pull request #1442: HADOOP-16570. S3A committers encounter scale issues

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

steveloughran commented on a change in pull request #1442: HADOOP-16570. S3A committers encounter scale issues
URL: https://github.com/apache/hadoop/pull/1442#discussion_r330174754
 
 

 ##########
 File path: hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/commit/AbstractS3ACommitter.java
 ##########
 @@ -390,22 +402,25 @@ protected void maybeCreateSuccessMarker(JobContext context,
   }
 
   /**
-   * Base job setup deletes the success marker.
-   * TODO: Do we need this?
+   * Base job setup (optionally) deletes the success marker and
+   * always creates the destination directory.
+   * When objects are committed that dest dir marker will inevitably
+   * be deleted; creating it now ensures there is something at the end
+   * while the job is in progress -and if nothing is created, that
+   * it is still there.
    * @param context context
    * @throws IOException IO failure
    */
-/*
 
   @Override
   public void setupJob(JobContext context) throws IOException {
-    if (createJobMarker) {
-      try (DurationInfo d = new DurationInfo("Deleting _SUCCESS marker")) {
+    try (DurationInfo d = new DurationInfo(LOG, "preparing destination")) {
+      if (createJobMarker){
         commitOperations.deleteSuccessMarker(getOutputPath());
       }
+      getDestFS().mkdirs(getOutputPath());
 
 Review comment:
   aah, because sometimes we've had our terasort tests fail saying there's a tombstone at the far end, and I suspect it means that sometimes we somehow aren't getting that directory created. So I'm doing it preemptively

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
users@infra.apache.org


With regards,
Apache Git Services

---------------------------------------------------------------------
To unsubscribe, e-mail: common-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: common-issues-help@hadoop.apache.org