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From Gvain <...@git.apache.org>
Subject [GitHub] incubator-storm pull request: STORM-312 : add storm monitor tools ...
Date Wed, 02 Jul 2014 03:32:48 GMT
Github user Gvain commented on a diff in the pull request:

    https://github.com/apache/incubator-storm/pull/117#discussion_r14439538
  
    --- Diff: storm-core/src/jvm/backtype/storm/utils/Monitor.java ---
    @@ -0,0 +1,178 @@
    +/**
    + * 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 backtype.storm.utils;
    +
    +import backtype.storm.generated.*;
    +import java.util.Map;
    +
    +public class Monitor {
    +    private static final String WATCH_TRANSFERRED = "transferred";
    +    private static final String WATCH_EMITTED = "emitted";
    +
    +    private int _interval = 4;
    +    private String _topology;
    +    private String _component;
    +    private String _stream;
    +    private String _watch;
    +
    +    private static class MetricsState {
    +        long lastStatted = 0;
    +        long lastTime = 0;
    +    }
    +
    +    private static class Poller {
    +        long startTime = 0;
    +        long pollMs = 0;
    +
    +        public long nextPoll() {
    +            long now = System.currentTimeMillis();
    +            long cycle = (now - startTime) / pollMs;
    +            long wakeupTime = startTime + (pollMs * (cycle + 1));
    +            long sleepTime = wakeupTime - now;
    +            if (sleepTime > 0) {
    +                try {
    +                    Thread.sleep(sleepTime);
    +                } catch (InterruptedException e) {
    +                    e.printStackTrace();
    +                }
    +            }
    +            now = System.currentTimeMillis();
    +            return now;
    +        }
    +    }
    +
    +    public void metrics(Nimbus.Client client) throws Exception {
    +        if (_interval <= 0) {
    +            throw new IllegalArgumentException("poll interval must be positive");
    +        }
    +
    +        if (_topology == null || _topology.isEmpty()) {
    +            throw new IllegalArgumentException("topology name must be something");
    +        }
    +
    +        if (_component == null || _component.isEmpty()) {
    +            throw new IllegalArgumentException("component name must be something");
    +        }
    +
    +        if (_stream == null || _stream.isEmpty()) {
    +            throw new IllegalArgumentException("stream name must be something");
    +        }
    +
    +        if ( !WATCH_TRANSFERRED.equals(_watch) && !WATCH_EMITTED.equals(_watch))
{
    +            throw new IllegalArgumentException("watch item must either be transferred
or emitted");
    +        }
    +        System.out.println("topology\tslots\texecutors\texecutorsWithMetrics\tcomponent\tstream\ttime-diff
ms\t" + _watch + "\tthroughput (Kt/s)");
    --- End diff --
    
    Yes, parallelism makes sense


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