JanusGraph，Spark 集群无法连接到 Cassandra

Question

我正在尝试运行在创建 JanusGraph 的集群上执行 Spark 作业。

我在一台机器上有一个 JanusGraph 服务器、Cassandra、ES 运行ning 实例，只有 Spark 计算发生在集群上。（基本上我在机器上做了一个janusgraph.sh start

我的配置如下（x是我运行上面实例所在机器的IP）：

def getGraph(): JanusGraph = {
    val config = JanusGraphFactory.build()
    config.set("storage.backend", "cassandrathrift")
    config.set("storage.cassandrathrift.keyspace", "jgex")
    config.set("storage.hostname", "x")
    config.set("index.jgex.backend", "elasticsearch")
    config.set("index.jgex.index-name", "jgex")
    config.set("jgex.hostname", "x")
    config.open()
  }

但是当我对集群上的 fat jar 执行 spark-submit 时，我得到了这个：

    java.lang.IllegalArgumentException: Could not instantiate implementation: org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager
    at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:69)
    at org.janusgraph.diskstorage.Backend.getImplementationClass(Backend.java:477)
    at org.janusgraph.diskstorage.Backend.getStorageManager(Backend.java:409)
    at org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration.<init>(GraphDatabaseConfiguration.java:1376)
    at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:164)
    at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:133)
    at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:123)
    at org.janusgraph.core.JanusGraphFactory$Builder.open(JanusGraphFactory.java:264)
    at janus_create$.getGraph(janus_create.scala:66)
    at janus_create$.makePropertiesandIndexes(janus_create.scala:830)
    at janus_create$.main(janus_create.scala:921)
    at janus_create.main(janus_create.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.yarn.ApplicationMaster$$anon.run(ApplicationMaster.scala:627)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:58)
    ... 16 more
Caused by: org.janusgraph.diskstorage.TemporaryBackendException: Temporary failure in storage backend
    at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.getCassandraPartitioner(CassandraThriftStoreManager.java:219)
    at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.<init>(CassandraThriftStoreManager.java:198)
    ... 21 more
Caused by: org.apache.thrift.transport.TTransportException: java.net.ConnectException: Connection refused (Connection refused)
    at org.apache.thrift.transport.TSocket.open(TSocket.java:187)
    at org.apache.thrift.transport.TFramedTransport.open(TFramedTransport.java:81)
    at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeRawConnection(CTConnectionFactory.java:110)
    at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeObject(CTConnectionFactory.java:74)
    at org.janusgraph.diskstorage.cassandra.thrift.thriftpool.CTConnectionFactory.makeObject(CTConnectionFactory.java:43)
    at org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:1179)
    at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.getCassandraPartitioner(CassandraThriftStoreManager.java:216)
    ... 22 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at org.apache.thrift.transport.TSocket.open(TSocket.java:182)
    ... 28 more

我尝试在 cassandra 和 cassandrathrift 之间切换，但都没有用。另外，我在哪里指定我的 gremlin 在哪里运行ning。这相关吗？

Answer 1

预先打包的分发假定每个 Cassandra、Elasticsearch 和 Gremlin 服务器都有一个本地主机节点。请注意堆栈跟踪底部的 java.net.ConnectException: Connection refused。如果您在远程集群上安装了 Spark 运行，则需要确保服务器在非本地主机地址上可用。

先用bin/janusgraph.sh stop停止分发
使用机器的IP地址更新$JANUSGRAPH_HOME/conf/cassandra/cassandra.yaml中的listen_address和rpc_address(Cassandra docs)
使用机器的IP地址(Elasticsearch docs)将network.host添加到$JANUSGRAPH_HOME/elasticsearch/config/elasticsearch.yml
使用机器的 IP 地址更新 $JANUSGRAPH_HOME/conf/gremlin-server/gremlin-server.yaml 中的 host (JanusGraph docs)
假设您正在使用默认的 Gremlin 服务器配置 gremlin-server.yaml，您需要使用机器的 IP 地址更新 $JANUSGRAPH_HOME/conf/gremlin-server/janusgraph-cassandra-es-server.properties 中的属性文件。使用机器的 IP 地址更新 storage.hostname 和 index.search.hostname，匹配上面的服务器设置。

更新：您的图形连接属性中似乎存在可能导致问题的错误：

config.set("storage.cassandrathrift.keyspace", "jgex") -- 应该是 "storage.cassandra.keyspace"
config.set("jgex.hostname", "x") -- 应该是 "index.jgex.hostname"

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