skywalking-java/docs/en/FAQ

FAQs

These are known and common FAQs. We welcome you to contribute yours.

Design

• Why doesn't SkyWalking involve MQ in the architecture?

Compiling

• Protoc plugin fails in maven build
• Required items could not be found, when import project into Eclipse
• Maven compilation failure with python2 not found error

Runtime

• 8.x+ upgrade
• Why metrics indexes(ElasticSearch) in Hour and Day precisions stop update after upgrade to 7.x?
• 6.x version upgrade
• Why only traces in UI?
• The trace doesn't continue in kafka consumer side
• Agent or collector version upgrade, 3.x -> 5.0.0-alpha
• EnhanceRequireObjectCache class cast exception
• ElasticSearch server performance FAQ, including ERROR CODE:429
• IllegalStateException when install Java agent on WebSphere 7
• "FORBIDDEN/12/index read-only / allow delete (api)" appears in the log
• No data shown and backend replies with "Variable 'serviceId' has coerced Null value for NonNull type 'ID!'"
• Unexpected endpoint register warning after 6.6.0
• Use the profile exporter tool if the profile analysis is not right
• Compatible with other javaagent bytecode processing
• Java agent memory leak when enhance Worker thread at use Thread Pool
• Thrift plugin

UI

• What is VNode? And why does SkyWalking have that?