Github user zsxwing commented on a diff in the pull request:
    --- Diff: 
    @@ -336,17 +342,27 @@ class StreamExecution(
         if (hasNewData) {
           reportTimeTaken(OFFSET_WAL_WRITE_LATENCY) {
    -        assert(
    -          offsetLog.add(currentBatchId, 
    +        assert(offsetLog.add(currentBatchId, 
               s"Concurrent update to the log. Multiple streaming jobs detected 
for $currentBatchId")
             logInfo(s"Committed offsets for batch $currentBatchId.")
    +        // Now that we've updated the scheduler's persistent checkpoint, 
it is safe for the
    +        // sources to discard data from *before* the previous batch.
    +        // The scheduler might still request the previous batch from a 
source in some cases
    +        // if a crash and recovery occured.
    --- End diff --
    nit: occured -> occurred

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