如何 spark-submit 到 ZooKeeper 管理的 Mesos 集群（给出 java.net.UnknownHostException: zk for mesos://zk:// master URL）？

Question

我是运行 Spark 2.0.2 和 Mesos 0.28.2。

我正在尝试使用 ZooKeeper 管理的 Mesos 集群作为主节点向 Spark 提交应用程序：

$SPARK_HOME/bin/spark-submit --verbose \
--conf spark.mesos.executor.docker.image=$DOCKER_IMAGE \
--conf spark.mesos.executor.home=$SPARK_HOME \
--conf spark.executorEnv.MESOS_NATIVE_JAVA_LIBRARY=/usr/lib/libmesos.so \
--deploy-mode cluster \
--master mesos://zk://<ip 1>:2181,<ip 2>:2181,<ip 3>:2181/mesos \
--class $APP_MAIN_CLASS \
file://$APP_JAR_PATH

（<ip 1>、<ip 2> 和 <ip 3> 是 10.0.0.0/8 块中的 IPv4 地址）

根据documentation，我好像掌握了正确的格式：

The Master URLs for Mesos are in the form mesos://host:5050 for a single-master Mesos cluster, or mesos://zk://host1:2181,host2:2181,host3:2181/mesos for a multi-master Mesos cluster using ZooKeeper.

但是，Spark 似乎正在读取 mesos://zk://... 字符串，然后尝试连接到 zk:

17/04/07 20:10:06 INFO RestSubmissionClient: Submitting a request to launch an application in mesos://zk://<ip 1>:2181,<ip 2>:2181,<ip 3>:2181/mesos.
Exception in thread "main" java.net.UnknownHostException: zk
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
    at sun.net.www.http.HttpClient.New(HttpClient.java:308)
    at sun.net.www.http.HttpClient.New(HttpClient.java:326)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1202)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1138)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1032)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:966)
    at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1316)
    at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1291)
    at org.apache.spark.deploy.rest.RestSubmissionClient.org$apache$spark$deploy$rest$RestSubmissionClient$$postJson(RestSubmissionClient.scala:214)
    at org.apache.spark.deploy.rest.RestSubmissionClient$$anonfun$createSubmission.apply(RestSubmissionClient.scala:89)
    at org.apache.spark.deploy.rest.RestSubmissionClient$$anonfun$createSubmission.apply(RestSubmissionClient.scala:85)
    at scala.collection.TraversableLike$WithFilter$$anonfun$foreach.apply(TraversableLike.scala:733)
    at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
    at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
    at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:732)
    at org.apache.spark.deploy.rest.RestSubmissionClient.createSubmission(RestSubmissionClient.scala:85)
    at org.apache.spark.deploy.rest.RestSubmissionClient$.run(RestSubmissionClient.scala:417)
    at org.apache.spark.deploy.rest.RestSubmissionClient$.main(RestSubmissionClient.scala:430)
    at org.apache.spark.deploy.rest.RestSubmissionClient.main(RestSubmissionClient.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:736)
    at org.apache.spark.deploy.SparkSubmit$.doRunMain(SparkSubmit.scala:185)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:210)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:124)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

如何让 Spark 识别它应该使用三个 ZooKeeper 节点而不是尝试连接到一个不存在的 zk 主机？

Answer 1

tl;dr 除非您将 --deploy-mode 更改为 client 或使用主 URL 与单个Mesos 主机，例如mesos://host:port.

下一行给出了在哪里可以找到相关代码的提示。

17/04/07 20:10:06 INFO RestSubmissionClient: Submitting a request to launch an application in mesos://zk://:2181,:2181,:2181/mesos.

看起来该消息仅针对 --deploy-mode cluster 使用 Spark Standalone 和 Apache Mesos 打印出来。改成默认的client部署路径会变，希望能接受masterURL.

自己看看负责集群部署的代码 -- RestSubmissionClient.

Here RestSubmissionClient 说：

private val supportedMasterPrefixes = Seq("spark://", "mesos://")

这证明 mesos:// URL 已被覆盖，但 here 您会看到以下内容：

private val masters: Array[String] = if (master.startsWith("spark://")) {
  Utils.parseStandaloneMasterUrls(master)
} else {
  Array(master)
}

打印出来 here 如上面的 INFO 消息显示 URL can only be a single Mesos master.

如何 spark-submit 到 ZooKeeper 管理的 Mesos 集群（给出 java.net.UnknownHostException: zk for mesos://zk:// master URL）？

How to spark-submit to ZooKeeper-managed Mesos cluster (gives java.net.UnknownHostException: zk for mesos://zk:// master URL)?

apache-spark

mesos