[GitHub] [incubator-hudi] n3nash commented on a change in pull request #996: Fixes to ensure MOR incr pull provides consistent results

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

n3nash commented on a change in pull request #996: Fixes to ensure MOR incr pull provides consistent results
URL: https://github.com/apache/incubator-hudi/pull/996#discussion_r344364466
 
 

 ##########
 File path: hudi-common/src/main/java/org/apache/hudi/common/table/timeline/HoodieActiveTimeline.java
 ##########
 @@ -58,19 +59,28 @@
 
   public static final SimpleDateFormat COMMIT_FORMATTER = new SimpleDateFormat("yyyyMMddHHmmss");
 
-  public static final Set<String> VALID_EXTENSIONS_IN_ACTIVE_TIMELINE = new HashSet<>(Arrays.asList(new String[] {
+  public static final Set<String> VALID_EXTENSIONS_IN_ACTIVE_TIMELINE = new HashSet<>(Arrays.asList(new String[]{
       COMMIT_EXTENSION, INFLIGHT_COMMIT_EXTENSION, DELTA_COMMIT_EXTENSION, INFLIGHT_DELTA_COMMIT_EXTENSION,
       SAVEPOINT_EXTENSION, INFLIGHT_SAVEPOINT_EXTENSION, CLEAN_EXTENSION, INFLIGHT_CLEAN_EXTENSION,
       INFLIGHT_COMPACTION_EXTENSION, REQUESTED_COMPACTION_EXTENSION, INFLIGHT_RESTORE_EXTENSION, RESTORE_EXTENSION}));
 
   private static final transient Logger log = LogManager.getLogger(HoodieActiveTimeline.class);
   protected HoodieTableMetaClient metaClient;
+  private static AtomicReference<String> lastInstantTime = new AtomicReference<>();
 
   /**
    * Returns next commit time in the {@link #COMMIT_FORMATTER} format.
+   * Ensures each commit time is atleast 1 second apart since we create COMMIT times at second granularity
    */
   public static String createNewCommitTime() {
-    return HoodieActiveTimeline.COMMIT_FORMATTER.format(new Date());
+    lastInstantTime.updateAndGet((oldVal) -> {
+      String newCommitTime;
+      do {
+        newCommitTime = HoodieActiveTimeline.COMMIT_FORMATTER.format(new Date());
+      } while (oldVal == newCommitTime);
 
 Review comment:
   I want to avoid an extra sleep since in most cases we should be 1 second apart. wdyt ?

----------------------------------------------------------------
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