docker - 为什么Titan会抛出java.lang.IllegalArgumentException？

Question

重现步骤
使用Docker v1.12.5设置环境:
在主机的 shell 中:

$ docker run -d --name=test.cassandra cassandra:2  # cassandra v2.2.8
$ docker build -t test .  # see below for Dockerfile
$ docker run -ti --rm=true -P --link test.cassandra:cassandra test bash

这是用于构建 test镜像的Dockerfile:

FROM openjdk:alpine
ENV TITAN 'titan-1.0.0-hadoop1'

#
# Install system packages & Titan
#
RUN apk update && apk add bash unzip && rm -rf /var/cache/apk/* \
    && adduser -S -s /bin/ash -D srg \
    && wget -O /tmp/$TITAN.zip http://s3.thinkaurelius.com/downloads/titan/$TITAN.zip \
    && unzip /tmp/$TITAN.zip -d /opt && ln -s /opt/$TITAN /opt/titan \
    && rm /tmp/*.zip \
    && chown -R srg /opt/$TITAN/

COPY conf/srg.properties /opt/$TITAN/conf/  # see below for file contents
USER srg

最后，这是 srg.properties的内容:

storage.backend=cassandra
storage.hostname=cassandra

cache.db-cache = true
cache.db-cache-clean-wait = 50
cache.db-cache-time = 10000
cache.db-cache-size = 0.25

此时，应该有两个容器在运行:一个带有cassandra的容器，另一个运行我们的 test镜像。您应该在后者上运行一个bash shell
启动Gremlin并观察错误
在 test容器的bash shell中:

$ cd /opt/titan
$ ./bin/gremlin.sh

这应该调出Gremlin shell 。从这里:

g = TitanFactory.open('conf/srg.properties')

这应该产生以下错误:

Could not instantiate implementation: com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager
Display stack trace? [yN] y
java.lang.IllegalArgumentException: Could not instantiate implementation: com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager
    at com.thinkaurelius.titan.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:55)
    at com.thinkaurelius.titan.diskstorage.Backend.getImplementationClass(Backend.java:473)
    at com.thinkaurelius.titan.diskstorage.Backend.getStorageManager(Backend.java:407)
    at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.<init>(GraphDatabaseConfiguration.java:1320)
    at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:94)
    at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:62)
    at com.thinkaurelius.titan.core.TitanFactory$open.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:110)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:122)
    at groovysh_evaluate.run(groovysh_evaluate:3)
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
    at org.codehaus.groovy.tools.shell.Interpreter.evaluate(Interpreter.groovy:69)
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
    at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:185)
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
    at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:119)
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
    at org.codehaus.groovy.tools.shell.ShellRunner.work(ShellRunner.groovy:94)
    at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$work(InteractiveShellRunner.groovy)
    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.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)
    at org.codehaus.groovy.tools.shell.InteractiveShellRunner.work(InteractiveShellRunner.groovy:123)
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
    at org.codehaus.groovy.tools.shell.ShellRunner.run(ShellRunner.groovy:58)
    at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$run(InteractiveShellRunner.groovy)
    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.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)
    at org.codehaus.groovy.tools.shell.InteractiveShellRunner.run(InteractiveShellRunner.groovy:82)
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
    at org.apache.tinkerpop.gremlin.console.Console.<init>(Console.groovy:144)
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
    at org.apache.tinkerpop.gremlin.console.Console.main(Console.groovy:303)
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 com.thinkaurelius.titan.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:44)
    ... 46 more
Caused by: com.thinkaurelius.titan.diskstorage.TemporaryBackendException: Temporary failure in storage backend
    at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.ensureKeyspaceExists(AstyanaxStoreManager.java:572)
    at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.<init>(AstyanaxStoreManager.java:291)
    ... 51 more
Caused by: com.netflix.astyanax.connectionpool.exceptions.PoolTimeoutException: PoolTimeoutException: [host=cassandra(172.17.0.2):9160, latency=10000(10000), attempts=1]Timed out waiting for connection
    at com.netflix.astyanax.connectionpool.impl.SimpleHostConnectionPool.waitForConnection(SimpleHostConnectionPool.java:231)
    at com.netflix.astyanax.connectionpool.impl.SimpleHostConnectionPool.borrowConnection(SimpleHostConnectionPool.java:198)
    at com.netflix.astyanax.connectionpool.impl.RoundRobinExecuteWithFailover.borrowConnection(RoundRobinExecuteWithFailover.java:84)
    at com.netflix.astyanax.connectionpool.impl.AbstractExecuteWithFailoverImpl.tryOperation(AbstractExecuteWithFailoverImpl.java:117)
    at com.netflix.astyanax.connectionpool.impl.AbstractHostPartitionConnectionPool.executeWithFailover(AbstractHostPartitionConnectionPool.java:352)
    at com.netflix.astyanax.thrift.ThriftClusterImpl.executeSchemaChangeOperation(ThriftClusterImpl.java:146)
    at com.netflix.astyanax.thrift.ThriftClusterImpl.internalCreateKeyspace(ThriftClusterImpl.java:321)
    at com.netflix.astyanax.thrift.ThriftClusterImpl.addKeyspace(ThriftClusterImpl.java:294)
    at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxStoreManager.ensureKeyspaceExists(AstyanaxStoreManager.java:567)
    ... 52 more

问题
总体而言，我的问题只是 “这是怎么回事，我该怎么办？”
我有一个现有的cassandra(dockerized)，我想在上面部署Titan。最终，我希望每台运行Cassandra的计算机上都运行一个Titan容器，并配置为连接到同一位置的cassandra容器。
一如既往地欢迎提出建议和问题。谢谢!

Answer 1

On a high level, my question is simply "What is going on here and what can I do about it?"

如果查看异常的“原因”链，原始的说:

Caused by: 
    com.netflix.astyanax.connectionpool.exceptions.PoolTimeoutException: 
    PoolTimeoutException: [host=cassandra(172.17.0.2):9160, 
                           latency=10000(10000), attempts=1]
    Timed out waiting for connection

在高水平..

这是因为您的Gremlin实例无法连接到Cassandra服务。最可能的解释是跨docker边界或您正在运行东西的主机与Cassandra主机之间的网络路由和/或防火墙存在问题。

在这种情况下，我要做的是:

检查正在使用的IP和端口号(异常(exception))以确保它们正确。

使用网络诊断工具(traceroute，tcptraceroute，ping等)确定是否可以建立与Cassandra的连接以及“阻塞”的位置。

接下来的操作取决于您的发现。