chenboat commented on a change in pull request #6778:
URL: https://github.com/apache/incubator-pinot/pull/6778#discussion_r623502241
##########
File path:
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/realtime/PinotLLCRealtimeSegmentManager.java
##########
@@ -1214,4 +1243,86 @@ private int
getMaxNumPartitionsPerInstance(InstancePartitions instancePartitions
return (numPartitions + numInstancesPerReplicaGroup - 1) /
numInstancesPerReplicaGroup;
}
}
+
+ /**
+ * Validate the committed low level consumer segments to see if its segment
store copy is available. Fix the missing segment store copy by asking servers
to upload to segment store.
+ * Since uploading to segment store involves expensive compression step
(first tar up the segment and then upload), we don't want to retry the
uploading. Segment without segment store copy can still be downloaded from peer
servers.
+ * @see <a
href="https://cwiki.apache.org/confluence/display/PINOT/By-passing+deep-store+requirement+for+Realtime+segment+completion#BypassingdeepstorerequirementforRealtimesegmentcompletion-Failurecasesandhandling";>By-passing
deep-store requirement for Realtime segment completion:Failure cases and
handling</a>
+ */
+ public void uploadToSegmentStoreIfMissing(TableConfig tableConfig) {
+ Preconditions.checkState(!_isStopping, "Segment manager is stopping");
+
+ String realtimeTableName = tableConfig.getTableName();
+ // Get all the LLC segment ZK metadata for this table
+ List<LLCRealtimeSegmentZKMetadata> segmentZKMetadataList =
ZKMetadataProvider.getLLCRealtimeSegmentZKMetadataListForTable(_propertyStore,
realtimeTableName);
+
+ // Iterate through llc segments and upload missing segment store copy by
following steps:
+ // 1. Ask servers which have online segment replica to upload to segment
store. Servers return segment store download url after successful uploading.
+ // 2. Update the llc segment ZK metadata by adding segment store download
url.
+ for (LLCRealtimeSegmentZKMetadata segmentZKMetadata :
segmentZKMetadataList) {
Review comment:
The in-memory queue plus a scan of recent segments should fix most
segment download url issues. Pinot controllers in our experiences restarted
rarely.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
