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https://issues.apache.org/jira/browse/GOBBLIN-1783?focusedWorklogId=847601&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-847601
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ASF GitHub Bot logged work on GOBBLIN-1783:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 25/Feb/23 01:26
Start Date: 25/Feb/23 01:26
Worklog Time Spent: 10m
Work Description: umustafi commented on code in PR #3640:
URL: https://github.com/apache/gobblin/pull/3640#discussion_r1117840401
##########
gobblin-service/src/main/java/org/apache/gobblin/service/modules/scheduler/GobblinServiceJobScheduler.java:
##########
@@ -342,8 +418,24 @@ public AddSpecResponse onAddSpec(Spec addedSpec) {
}
}
+ // Compare the modification timestamp of the spec being added if the
scheduler is being initialized, ideally we
+ // don't even want to do the same update twice as it will kill the
existing flow and reschedule it unnecessarily
+ Long modificationTime =
Long.valueOf(flowSpec.getConfigAsProperties().getProperty(FlowSpec.modificationTimeKey,
"0"));
+ String uriString = flowSpec.getUri().toString();
+ // If the modification time is 0 (which means the original API was used to
retrieve spec or warm standby mode is not
+ // enabled), spec not in scheduler, or have a modification time associated
with it assume it's the most recent
+ if (modificationTime != 0L &&
this.scheduledFlowSpecs.containsKey(uriString)
+ && this.lastUpdatedTimeForFlowSpec.containsKey(uriString)) {
+ if (this.lastUpdatedTimeForFlowSpec.get(uriString) >= modificationTime) {
+ _log.info("Ignoring the spec {} modified at time {} because we have a
more updated version from time {}",
+ addedSpec,
modificationTime,this.lastUpdatedTimeForFlowSpec.get(uriString));
+ return new AddSpecResponse(response);
+ }
+ }
+
// todo : we should probably not schedule a flow if it is a runOnce flow
this.scheduledFlowSpecs.put(flowSpecUri.toString(), addedSpec);
+ this.lastUpdatedTimeForFlowSpec.put(flowSpecUri.toString(),
modificationTime);
Review Comment:
We don't have to but there's no harm in having the check regardless.
Issue Time Tracking
-------------------
Worklog Id: (was: 847601)
Time Spent: 3h 10m (was: 3h)
> Initialize scheduler with batch gets instead of individual get per flow
> -----------------------------------------------------------------------
>
> Key: GOBBLIN-1783
> URL: https://issues.apache.org/jira/browse/GOBBLIN-1783
> Project: Apache Gobblin
> Issue Type: Bug
> Components: gobblin-service
> Reporter: Urmi Mustafi
> Assignee: Abhishek Tiwari
> Priority: Major
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> We seek to improve initialization time of the JobScheduler upon restart or
> new leadership change by batching the mysql queries to get flow specs.
> Instead of making 1 mysql get call for each flow execution id, which scales
> extremely poorly with number of flows, we should group them to reduce number
> of calls and downtime.
> This implementation adds two new functions to the SpecStore interface,
> getSortedSpecURIs and getBatchedSpecs, that we use to achieve the batching.
> Because these two functionalities are generic enough to be used in derived
> classes of the SpecStore we add them to the base class. Although this
> requires any child classes to implement these functions, it allows any
> consumer of the parent class SpecStore to use this functionality without
> caring about the specific implementation of the SpecStore used (as
> JobScheduler does). Additionally, the getBatchedSpecs requires an offset or
> starting point to obtain the batches from so the consumer has to do some book
> keeping of where in the paginated gets we are but this again separates the
> functionality from the use case of the consumer. the entirety of the flow
> catalog is too large to load into memory for the Scheduler, so we use this
> batch functionality.
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