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https://issues.apache.org/jira/browse/FLINK-2399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14713060#comment-14713060
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ASF GitHub Bot commented on FLINK-2399:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/945#discussion_r37977399
--- Diff:
flink-runtime/src/main/scala/org/apache/flink/runtime/jobmanager/JobManager.scala
---
@@ -121,11 +121,14 @@ class JobManager(
override val leaderSessionID = Some(UUID.randomUUID())
+ private var jobManagerVersionID: String = _
--- End diff --
Better to use `Option` instead of `null`.
> Fail when actor versions don't match
> ------------------------------------
>
> Key: FLINK-2399
> URL: https://issues.apache.org/jira/browse/FLINK-2399
> Project: Flink
> Issue Type: Improvement
> Components: JobManager, TaskManager
> Affects Versions: 0.9, master
> Reporter: Ufuk Celebi
> Assignee: Sachin Goel
> Priority: Minor
> Fix For: 0.10
>
>
> Problem: there can be subtle errors when actors from different Flink versions
> communicate with each other, for example when an old client (e.g. Flink 0.9)
> communicates with a new JobManager (e.g. Flink 0.10-SNAPSHOT).
> We can check that the versions match on first communication between the
> actors and fail if they don't match.
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