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https://issues.apache.org/jira/browse/SPARK-11115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14979023#comment-14979023
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watson xi commented on SPARK-11115:
-----------------------------------
I keep having this problem myself. It only happens itermitently and I have no
idea why. Not accessing any remote hosts.
> Host verification is not correct for IPv6
> -----------------------------------------
>
> Key: SPARK-11115
> URL: https://issues.apache.org/jira/browse/SPARK-11115
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.5.1
> Environment: CentOS 6.7, Java 1.8.0_25, dual stack IPv4 + IPv6
> Reporter: Thomas Dudziak
> Priority: Critical
>
> When running Spark with -Djava.net.preferIPv6Addresses=true, I get this error:
> 15/10/14 14:36:01 ERROR SparkContext: Error initializing SparkContext.
> java.lang.AssertionError: assertion failed: Expected hostname
> at scala.Predef$.assert(Predef.scala:179)
> at org.apache.spark.util.Utils$.checkHost(Utils.scala:805)
> at
> org.apache.spark.storage.BlockManagerId.<init>(BlockManagerId.scala:48)
> at
> org.apache.spark.storage.BlockManagerId$.apply(BlockManagerId.scala:107)
> at
> org.apache.spark.storage.BlockManager.initialize(BlockManager.scala:190)
> at org.apache.spark.SparkContext.<init>(SparkContext.scala:528)
> at
> org.apache.spark.repl.SparkILoop.createSparkContext(SparkILoop.scala:1017)
> Looking at the code in question, it seems that the code will only work for
> IPv4 as it assumes ':' can't be part of the hostname (which it clearly can
> for IPv6 addresses).
> Instead, the code should probably use Guava's HostAndPort class, i.e.:
> def checkHost(host: String, message: String = "") {
> assert(!HostAndPort.fromString(host).hasPort, message)
> }
> def checkHostPort(hostPort: String, message: String = "") {
> assert(HostAndPort.fromString(hostPort).hasPort, message)
> }
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