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https://issues.apache.org/jira/browse/KAFKA-1742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14192733#comment-14192733
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Onur Karaman commented on KAFKA-1742:
-------------------------------------
partitionLeadershipInfo and partitionReplicaAssignment are mutable.Maps. Given
that a mutable.Map may be arbitrarily ordered, dropping the longest prefix of
elements that satisfy a predicate can cause incorrect results.
It's also noted in the scaladocs
[http://www.scala-lang.org/api/current/index.html#scala.collection.mutable.Map@dropWhile(p:A=>Boolean):Repr]
For example:
{code}
import collection._
object Main {
def main(args: Array[String]) {
var m = mutable.Map(5 -> 2, 3 -> 6)
println("original: " + m)
println("using filter: " + m.filter(p => p._1 != 3))
println("using dropWhile: " + m.dropWhile(p => p._1 == 3))
}
}
{code}
Outputs:
{code}
original: Map(5 -> 2, 3 -> 6)
using filter: Map(5 -> 2)
using dropWhile: Map(5 -> 2, 3 -> 6)
{code}
> ControllerContext removeTopic does not correctly update state
> -------------------------------------------------------------
>
> Key: KAFKA-1742
> URL: https://issues.apache.org/jira/browse/KAFKA-1742
> Project: Kafka
> Issue Type: Bug
> Reporter: Onur Karaman
> Assignee: Onur Karaman
> Priority: Blocker
> Fix For: 0.8.2
>
>
> removeTopic does not correctly update the state of ControllerContext.
> This is because it removes the topic from some underlying maps through
> dropWhile.
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