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From ctubbsii <...@git.apache.org>
Subject [GitHub] accumulo pull request #223: ACCUMULO-4409 Create AccumuloMonitorAppender
Date Wed, 01 Mar 2017 16:59:55 GMT
Github user ctubbsii commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/223#discussion_r103734610
  
    --- Diff: server/monitor/src/main/java/org/apache/accumulo/monitor/util/AccumuloMonitorAppender.java
---
    @@ -0,0 +1,153 @@
    +/*
    + * 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.accumulo.monitor.util;
    +
    +import static java.nio.charset.StandardCharsets.UTF_8;
    +
    +import java.util.concurrent.Executors;
    +import java.util.concurrent.ScheduledExecutorService;
    +import java.util.concurrent.TimeUnit;
    +import java.util.concurrent.atomic.AtomicBoolean;
    +
    +import org.apache.accumulo.core.Constants;
    +import org.apache.accumulo.core.client.Instance;
    +import org.apache.accumulo.core.conf.Property;
    +import org.apache.accumulo.core.zookeeper.ZooUtil;
    +import org.apache.accumulo.fate.zookeeper.ZooCache;
    +import org.apache.accumulo.fate.zookeeper.ZooCacheFactory;
    +import org.apache.accumulo.server.client.HdfsZooInstance;
    +import org.apache.log4j.AsyncAppender;
    +import org.apache.log4j.net.SocketAppender;
    +import org.apache.zookeeper.data.Stat;
    +
    +import com.google.common.net.HostAndPort;
    +
    +public class AccumuloMonitorAppender extends AsyncAppender {
    --- End diff --
    
    Yes, I created a thread in the master which logged a message every 10 seconds, and killed
and restarted the master on a few different ports. It's how I found that I needed to check
for a change in the `modified zookeeper transaction id` instead of just a change in the value...
otherwise it wouldn't update if the monitor was restarted at the same location.


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