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From afine <...@git.apache.org>
Subject [GitHub] zookeeper pull request #440: ZOOKEEPER-2939 Deal with maxbuffer as it relate...
Date Mon, 08 Jan 2018 20:40:30 GMT
Github user afine commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/440#discussion_r160249680
  
    --- Diff: src/java/main/org/apache/zookeeper/server/quorum/ProposalStats.java ---
    @@ -0,0 +1,70 @@
    +/**
    + * 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.zookeeper.server.quorum;
    +
    +import com.codahale.metrics.ExponentiallyDecayingReservoir;
    +import com.codahale.metrics.Histogram;
    +import com.codahale.metrics.JmxReporter;
    +import com.codahale.metrics.MetricRegistry;
    +import com.codahale.metrics.Reservoir;
    +import com.codahale.metrics.Snapshot;
    +import org.apache.zookeeper.jmx.CommonNames;
    +import org.apache.zookeeper.jmx.MBeanRegistry;
    +
    +import static com.codahale.metrics.MetricRegistry.name;
    +
    +/**
    + * Provides real-time metrics on Leader's proposal size.
    + * The class uses a histogram included in Dropwizard metrics library with ExponentiallyDecayingReservoir.
    + * It provides stats of proposal sizes from the last 5 minutes with acceptable cpu/memory
footprint optimized for streaming data.
    + */
    +public class ProposalStats {
    +    private final Histogram proposalSizes;
    +
    +    ProposalStats() {
    +        final MetricRegistry metrics = new MetricRegistry();
    +        Reservoir reservoir = new ExponentiallyDecayingReservoir();
    --- End diff --
    
    Perhaps a user configurable SlidingTimeWindowReservoir may be more appropriate?


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