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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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