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confluentinc / cp-demo

Confluent Platform Demo including Apache Kafka, ksqlDB, Control Center, Schema Registry, Security, Schema Linking, and Cluster Linking
Apache License 2.0
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MDS fails to start due to wrong Java version #367

Closed ybyzek closed 3 years ago

ybyzek commented 3 years ago

Description

Start script failure:

Waiting up to 120 seconds for MDS to start
........................ERROR: Failed after 120 seconds. Please troubleshoot and run again.

Docker logs:

[2021-04-14 20:35:00,087] WARN Failed to initialize a channel. Closing: [id: 0x67e8d0a5] (io.netty.channel.ChannelInitializer)
kafka2      | org.apache.zookeeper.common.X509Exception$SSLContextException: Failed to create KeyManager
kafka2      |   at org.apache.zookeeper.common.X509Util.createSSLContextAndOptions(X509Util.java:336)
kafka2      |   at org.apache.zookeeper.common.X509Util.createSSLContext(X509Util.java:268)
kafka2      |   at org.apache.zookeeper.ClientCnxnSocketNetty$ZKClientPipelineFactory.initSSL(ClientCnxnSocketNetty.java:454)
kafka2      |   at org.apache.zookeeper.ClientCnxnSocketNetty$ZKClientPipelineFactory.initChannel(ClientCnxnSocketNetty.java:444)
kafka2      |   at org.apache.zookeeper.ClientCnxnSocketNetty$ZKClientPipelineFactory.initChannel(ClientCnxnSocketNetty.java:429)
kafka2      |   at io.netty.channel.ChannelInitializer.initChannel(ChannelInitializer.java:129)
kafka2      |   at io.netty.channel.ChannelInitializer.handlerAdded(ChannelInitializer.java:112)
kafka2      |   at io.netty.channel.AbstractChannelHandlerContext.callHandlerAdded(AbstractChannelHandlerContext.java:938)
kafka2      |   at io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(DefaultChannelPipeline.java:609)
kafka2      |   at io.netty.channel.DefaultChannelPipeline.access$100(DefaultChannelPipeline.java:46)
kafka2      |   at io.netty.channel.DefaultChannelPipeline$PendingHandlerAddedTask.execute(DefaultChannelPipeline.java:1463)
kafka2      |   at io.netty.channel.DefaultChannelPipeline.callHandlerAddedForAllHandlers(DefaultChannelPipeline.java:1115)
kafka2      |   at io.netty.channel.DefaultChannelPipeline.invokeHandlerAddedIfNeeded(DefaultChannelPipeline.java:650)
kafka2      |   at io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:502)
kafka2      |   at io.netty.channel.AbstractChannel$AbstractUnsafe.access$200(AbstractChannel.java:417)
kafka2      |   at io.netty.channel.AbstractChannel$AbstractUnsafe$1.run(AbstractChannel.java:474)
kafka2      |   at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
kafka2      |   at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
kafka2      |   at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
kafka2      |   at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
kafka2      |   at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
kafka2      |   at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
kafka2      |   at java.base/java.lang.Thread.run(Thread.java:834)

Environment

Based on user troubleshooting, it fails due to Java version.

/Library/Java/JavaVirtualMachines/jdk-16.jdk/Contents/Home/bin/java --version
java 16 2021-03-16
Java(TM) SE Runtime Environment (build 16+36-2231)
Java HotSpot(TM) 64-Bit Server VM (build 16+36-2231, mixed mode, sharing)

The demo should not have a Java dependency (except for building the Kafka Streams app), but maybe it's tied into keytool?

akoh-confluent commented 3 years ago

I've also hit the same issue with 6.1.1-post, and downgrading the JAVA version resolved it. Would it be worth adding a note to the tutorial documentation or the troubleshooting page to highlight this?

https://docs.confluent.io/platform/current/tutorials/cp-demo/docs/on-prem.html#cp-demo-on-prem-tutorial https://docs.confluent.io/platform/current/tutorials/cp-demo/docs/troubleshooting.html#cp-demo-troubleshooting

ybyzek commented 3 years ago

@akoh-confluent docs enhancement would be helpful. Additional options: