vjagadish1989 commented on a change in pull request #952: Improved
standby-aware container allocation for active-containers on job redeploys
URL: https://github.com/apache/samza/pull/952#discussion_r267638140
##########
File path:
samza-core/src/main/java/org/apache/samza/clustermanager/StandbyContainerManager.java
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@@ -226,15 +244,35 @@ private void initiateActiveContainerFailover(String
containerID, String resource
// use this standby if there was no previous failover for which this
standbyResource was used
if (!(failoverMetadata.isPresent() &&
failoverMetadata.get().isStandbyResourceUsed(standbyContainerResource.getResourceID())))
{
- log.info("Returning standby container {} in running state for active
container {}", standbyContainerID,
- activeContainerID);
- return Optional.of(new Entry<>(standbyContainerID,
standbyContainerResource));
+ log.info("Returning standby container {} in running state on host {}
for active container {}", standbyContainerID,
standbyContainerResource.getHost(), activeContainerID);
+ return standbyContainerResource.getHost();
}
}
}
-
log.info("Did not find any running standby container for active container
{}", activeContainerID);
- return Optional.empty();
+
+ // Now, we iterate over the list of last-known standbyHosts to check if
anyone of them has not already been tried
+ Map<String, String> containerToHostMapping =
this.samzaApplicationState.jobModelManager.jobModel().getAllContainerLocality();
+
+ for (String standbyContainerID :
this.standbyContainerConstraints.get(activeContainerID)) {
+ String standbyHost = containerToHostMapping.get(standbyContainerID);
Review comment:
We appear to be re-implementing some of querying logic to find the host for
a standby-container. Instead, leverage the existing APIs in jobModel to query
the host for a specific containerId
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