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https://issues.apache.org/jira/browse/SPARK-19432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849141#comment-15849141
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Apache Spark commented on SPARK-19432:
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User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/16773
> Fix an unexpected failure when connecting timeout
> -------------------------------------------------
>
> Key: SPARK-19432
> URL: https://issues.apache.org/jira/browse/SPARK-19432
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.0.2, 2.1.0
> Reporter: Shixiong Zhu
> Assignee: Shixiong Zhu
> Priority: Minor
>
> When connecting timeout, `ask` may fail with a confusing message:
> {code}
> 17/02/01 23:15:19 INFO Worker: Connecting to master ...
> java.lang.IllegalArgumentException: requirement failed: TransportClient has
> not yet been set.
> at scala.Predef$.require(Predef.scala:224)
> at
> org.apache.spark.rpc.netty.RpcOutboxMessage.onTimeout(Outbox.scala:70)
> at
> org.apache.spark.rpc.netty.NettyRpcEnv$$anonfun$ask$1.applyOrElse(NettyRpcEnv.scala:232)
> at
> org.apache.spark.rpc.netty.NettyRpcEnv$$anonfun$ask$1.applyOrElse(NettyRpcEnv.scala:231)
> at
> scala.concurrent.Future$$anonfun$onFailure$1.apply(Future.scala:138)
> at
> scala.concurrent.Future$$anonfun$onFailure$1.apply(Future.scala:136)
> at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
> {code}
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