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I have an existing application which uses Apache Cassandra, and I am attempting to check its compatibility with Azure Cosmos DB for Apache Cassandra
My application uses a recent 4.x version of the DataStax Java Driver for Cassandra (this has subsequently been adopted by Apache themselves).
To eliminate my app from the equation, I took the sample from here and tried it - then updated it to the newest driver and tried again:
https://github.com/Azure-Samples/azure-cosmos-db-cassandra-java-getting-started-v4/tree/master
No matter what I do, this is the error I get:
com.datastax.oss.driver.internal.core.protocol.FrameDecodingException: Error decoding frame for streamId 21584
at com.datastax.oss.driver.internal.core.protocol.FrameDecoder.decode(FrameDecoder.java:108)
at io.netty.handler.codec.LengthFieldBasedFrameDecoder.decode(LengthFieldBasedFrameDecoder.java:333)
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:530)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:469)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1519)
...
Caused by: com.datastax.oss.driver.api.core.connection.FrameTooLongException: Adjusted frame length exceeds 268435456: 825110825 - discarded
[s0] Error connecting to Node(endPoint=xxxx.documents.azure.com/xxx:443, hostId=null, hashCode=1e66f887), trying next node
What am I doing wrong? Can anyone provide the simplest possible working piece of Java which connects to Cosmos using a Cassandra driver?
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I hope this is helpful! Do not hesitate to let me know if you have any other questions or clarifications.
I eventually worked out that I need to use xxx.cassandra.cosmos.azure.com port 10350 - Microsoft's tutorial tells you to do this to look up your contact points:
az cosmosdb show --resource-group "xxx" --name "yyy" --query "{username:name,contactPoint:documentEndpoint}"
This gives an incorrect hostname and an incorrect port (443).
Looking in the Azure Console provided the answer.
Hi @David North ,
Welcome to the Microsoft Q&A and thank you for posting your questions here.
The error occurs because the driver is connecting to the wrong endpoint and port. Azure Cosmos DB for Apache Cassandra requires the Cassandra API endpoint and CQL protocol over TLS.
FrameTooLongException happens when the driver receives HTTPS from the SQL API endpoint instead of CQL frames. Switching to the Cassandra API endpoint resolves this.
Key points:
your-account-name.cassandra.cosmos.azure.com on port 10350 (not *.documents.azure.com:443).localDatacenter to the exact Azure region name of your account (e.g., "Region name").LOCAL_QUORUM.com.datastax.oss:java-driver-core:4.xIf the issue persists, please share the required details in a private message.