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From pwendell <...@git.apache.org>
Subject [GitHub] spark pull request: [WIP] [SPARK-1132] Persisting Web UI through r...
Date Tue, 04 Mar 2014 20:41:48 GMT
Github user pwendell commented on a diff in the pull request:

    https://github.com/apache/spark/pull/42#discussion_r10273534
  
    --- Diff: core/src/main/scala/org/apache/spark/ui/UIReloader.scala ---
    @@ -0,0 +1,46 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
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    + * The ASF licenses this file to You under the Apache License, Version 2.0
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    +
    +package org.apache.spark.ui
    +
    +/**
    + * Reload a persisted UI independently from a SparkContext
    + */
    +object UIReloader {
    --- End diff --
    
    We should think a bit about the right way to expose the "rebuild a UI" logic inside of
Spark. The first goal here is that the existing standalone cluster manager should, once an
application completes, be able to re-render the existing UI for that application. The ideal
semantics would be that you can just point to a directory in HDFS known to contain the logs
and have it add new handlers to an existing jetty server. Right now the SparkUI starts its
own server always so that might need to be altered. 
    
    A second goal is to have simple standalone version that can run in it's own JVM that basically
"watches" a base directory and reports new applications as they arrive. This one would also
need to create multiple SparkUI's in the same JVM.


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