dnishimura commented on a change in pull request #1119: SAMZA-2284: Remove
redundant getStreamMetadata calls in SamzaContainer startup sequence.
URL: https://github.com/apache/samza/pull/1119#discussion_r308807682
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File path:
samza-core/src/main/scala/org/apache/samza/container/TaskInstance.scala
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@@ -326,22 +324,22 @@ class TaskInstance(
* Check each partition assigned to the task is caught to the last offset
*/
def initCaughtUpMapping() {
- if (taskContext.getStreamMetadataCache != null) {
+ if (inputStreamMetadata != null && inputStreamMetadata.nonEmpty) {
systemStreamPartitions.foreach(ssp => {
- val partitionMetadata = taskContext
- .getStreamMetadataCache
- .getSystemStreamMetadata(ssp.getSystemStream, false)
- .getSystemStreamPartitionMetadata.get(ssp.getPartition)
-
- val upcomingOffset = partitionMetadata.getUpcomingOffset
- val startingOffset = offsetManager.getStartingOffset(taskName, ssp)
- .getOrElse(throw new SamzaException("No offset defined for
SystemStreamPartition: %s" format ssp))
-
- // Mark ssp to be caught up if the starting offset is already the
- // upcoming offset, meaning the task has consumed all the messages
- // in this partition before and waiting for the future incoming
messages.
- if(Objects.equals(upcomingOffset, startingOffset)) {
- ssp2CaughtupMapping(ssp) = true
+ if (inputStreamMetadata.contains(ssp.getSystemStream)) {
Review comment:
Can there be a scenario where the `inputStreamMetadata` does not contain the
`SystemStream` of interest? Would you need to fallback to querying the stream
metadata cache from the task context?
If not, it'd be good to at least log a warning in the else block in case we
need to troubleshoot in the future.
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