htran1 commented on a change in pull request #2653: [GOBBLIN-787] Add an option 
to include the task start time in the out…
URL: https://github.com/apache/incubator-gobblin/pull/2653#discussion_r288680811
 
 

 ##########
 File path: 
gobblin-runtime/src/main/java/org/apache/gobblin/runtime/fork/Fork.java
 ##########
 @@ -529,9 +529,18 @@ protected void cleanup() {
    */
   private DataWriter<Object> buildWriter()
       throws IOException {
+    String writerId = this.taskId;
+
+    // Add the task starting time if configured.
+    // This is used to reduce file name collisions which can happen due to the 
scheduling of a task on multiple workers.
+    // One case where this occurs is when a worker gets disconnected from a 
Helix cluster.
+    if 
(this.taskState.getPropAsBoolean(ConfigurationKeys.WRITER_ADD_TASK_TIMESTAMP, 
false)) {
+        writerId = this.taskId + "_" + 
this.taskState.getProp(ConfigurationKeys.TASK_START_TIME_MILLIS_KEY, "0");
 
 Review comment:
   Changed to thrown an exception if the task start time is not set.

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