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https://issues.apache.org/jira/browse/EAGLE-545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15512487#comment-15512487
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ASF GitHub Bot commented on EAGLE-545:
--------------------------------------

Github user haoch commented on a diff in the pull request:

    https://github.com/apache/incubator-eagle/pull/449#discussion_r79988603
  
    --- Diff: 
eagle-topology-check/eagle-topology-app/src/main/java/org/apache/eagle/topology/extractor/TopologyCrawler.java
 ---
    @@ -0,0 +1,26 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + *  Unless required by applicable law or agreed to in writing, software
    + *  distributed under the License is distributed on an "AS IS" BASIS,
    + *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
implied.
    + *  See the License for the specific language governing permissions and
    + *  limitations under the License.
    + *
    + */
    +
    +package org.apache.eagle.topology.extractor;
    +
    +
    +
    +public interface TopologyCrawler {
    +
    +    void extract();
    --- End diff --
    
    Add some meaningful java docs on interface methods


> hdfs/bhase/yarn health check 
> -----------------------------
>
>                 Key: EAGLE-545
>                 URL: https://issues.apache.org/jira/browse/EAGLE-545
>             Project: Eagle
>          Issue Type: New Feature
>    Affects Versions: v0.5.0
>            Reporter: Zhao, Qingwen
>            Assignee: Zhao, Qingwen
>
> The app aims to monitor those services with a master-slave structured 
> topology, and provides metrics at the HOST level. Specifically, this app will 
> support the following services healthy check
> * HDFS: namenode, datanode, journalnode
> * HBASE: hmaster, regionservers
> * YARN: resourcemanager, nodemanagers, historyserver
> More detailed requirements:
> 1. provides node level health diagnosis including the master nodes and slave 
> nodes
> 2. provide several cluster-level metrics



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