cloud-fan commented on code in PR #50230:
URL: https://github.com/apache/spark/pull/50230#discussion_r2320782342
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core/src/main/scala/org/apache/spark/MapOutputTracker.scala:
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@@ -169,6 +174,15 @@ private class ShuffleStatus(
} else {
mapIdToMapIndex.remove(currentMapStatus.mapId)
}
+ logDebug(s"Checksum of map output for task ${status.mapId} is
${status.checksumValue}")
+
+ val preStatus =
+ if (mapStatuses(mapIndex) != null) mapStatuses(mapIndex) else
mapStatusesDeleted(mapIndex)
+ if (preStatus != null && preStatus.checksumValue != status.checksumValue) {
+ logInfo(s"Checksum of map output changes from ${preStatus.checksumValue}
to " +
+ s"${status.checksumValue} for task ${status.mapId}.")
Review Comment:
oh it's from `TaskContext.taskAttemptId`, so it's task id.
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