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https://issues.apache.org/jira/browse/SPARK-11131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcelo Vanzin resolved SPARK-11131.
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Resolution: Fixed
Assignee: Marcelo Vanzin
Fix Version/s: 1.6.0
> Worker registration protocol is racy
> ------------------------------------
>
> Key: SPARK-11131
> URL: https://issues.apache.org/jira/browse/SPARK-11131
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.6.0
> Reporter: Marcelo Vanzin
> Assignee: Marcelo Vanzin
> Priority: Minor
> Fix For: 1.6.0
>
>
> I ran into this while making changes to the new RPC framework. Because the
> Worker registration protocol is based on sending unrelated messages between
> Master and Worker, it's possible that another message (e.g. caused by an a
> app trying to allocate workers) to arrive at the Worker before it knows the
> Master has registered it. This triggers the following code:
> {code}
> case LaunchExecutor(masterUrl, appId, execId, appDesc, cores_, memory_) =>
> if (masterUrl != activeMasterUrl) {
> logWarning("Invalid Master (" + masterUrl + ") attempted to launch
> executor.")
> {code}
> This may or may not be made worse by SPARK-11098.
> A simple workaround is to use an {{ask}} instead of a {{send}} for these
> messages. That should at least narrow the race.
> Note this is more of a problem in {{local-cluster}} mode, used a lot by unit
> tests, where Master and Worker instances are coming up as part of the app
> itself.
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