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Posted to dev@zeppelin.apache.org by "MOBIN (Jira)" <ji...@apache.org> on 2019/12/28 06:54:00 UTC

[jira] [Created] (ZEPPELIN-4521) jetty handle is slow

MOBIN created ZEPPELIN-4521:
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             Summary: jetty handle is slow
                 Key: ZEPPELIN-4521
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-4521
             Project: Zeppelin
          Issue Type: Bug
          Components: zeppelin-server
    Affects Versions: 0.8.0
         Environment: linux
            Reporter: MOBIN
         Attachments: [jstack log]-LOCKED Thread.jpg, [jstack log]-refresh notebook slow.jpg, [jstack log]-removeParagraph is slow.jpg, jpg1.jpg, jpg2.jpg, jpg3.jpg

*Phenomenon:* User refreshes notebook and remover paragpah slowly


*Preliminary analysis:* Some user's interpreter has been constantly brushing some error logs. When killing the user's spark task, zeppelin returns to normal, but I think that no matter what spark task the user runs, it will not affect at least zeppelin server, because the CPU and memory usage of the server and zeppelin gc are normal


*Reason:* Checking and monitoring found that Jetty's hadler took a long time to process the "/api/helium/suggest/" interface, such as jpg1.jpg


*Question:* I find that "/api/helium/suggest/" is called during the task's start and operation. If I don't use a third-party helium plugin, can I not call this interface? What exactly does this interface do? After I debug the source code, I find that it does nothing



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