jihoonson commented on a change in pull request #10676:
URL: https://github.com/apache/druid/pull/10676#discussion_r564931175



##########
File path: 
indexing-service/src/main/java/org/apache/druid/indexing/common/task/AbstractBatchIndexTask.java
##########
@@ -576,6 +584,64 @@ static Granularity 
findGranularityFromSegments(List<DataSegment> segments)
     }
   }
 
+  /**
+   * Wait for segments to become available on the cluster. If waitTimeout is 
reached, giveup on waiting. This is a
+   * QoS method that can be used to make Batch Ingest tasks wait to finish 
until their ingested data is available on
+   * the cluster. Doing so gives an end user assurance that a Successful task 
status means their data is available
+   * for querying.
+   *
+   * @param toolbox {@link TaskToolbox} object with for assisting with task 
work.
+   * @param segmentsToWaitFor {@link List} of segments to wait for 
availability.
+   * @param waitTimeout Millis to wait before giving up
+   * @return True if all segments became available, otherwise False.
+   */
+  protected boolean waitForSegmentAvailability(

Review comment:
       Good point. I agree. I think it would be better to not do such 
refactoring for parallel or hadoop task in this PR. But it would be still nice 
to reuse the same logic in both streaming and batch ingestion. Maybe we can 
extract this logic as a utility method?




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