com.alibaba.wasp.fserver.FSDumpServlet.java Source code

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Here is the source code for com.alibaba.wasp.fserver.FSDumpServlet.java

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/**
 *
 * 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 com.alibaba.wasp.fserver;

import com.alibaba.wasp.monitoring.StateDumpServlet;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.monitoring.LogMonitoring;
import org.apache.hadoop.hbase.monitoring.TaskMonitor;
import org.apache.hadoop.util.ReflectionUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Date;

@InterfaceAudience.Private
public class FSDumpServlet extends StateDumpServlet {
    private static final long serialVersionUID = 1L;
    private static final String LINE = "===========================================================";

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
        FServer fs = (FServer) getServletContext().getAttribute(FServer.FSERVER);
        assert fs != null : "No FS in context!";

        Configuration hrsconf = (Configuration) getServletContext().getAttribute(FServer.FSERVER_CONF);
        assert hrsconf != null : "No FS conf in context";

        response.setContentType("text/plain");
        OutputStream os = response.getOutputStream();
        PrintWriter out = new PrintWriter(os);

        out.println("Master status for " + fs.getServerName() + " as of " + new Date());

        out.println("\n\nVersion Info:");
        out.println(LINE);
        dumpVersionInfo(out);

        out.println("\n\nTasks:");
        out.println(LINE);
        TaskMonitor.get().dumpAsText(out);

        out.println("\n\nExecutors:");
        out.println(LINE);
        dumpExecutors(fs.getExecutorService(), out);

        out.println("\n\nStacks:");
        out.println(LINE);
        ReflectionUtils.printThreadInfo(out, "");

        out.println("\n\nFS Configuration:");
        out.println(LINE);
        Configuration conf = fs.getConfiguration();
        out.flush();
        conf.writeXml(os);
        os.flush();

        out.println("\n\nLogs");
        out.println(LINE);
        long tailKb = getTailKbParam(request);
        LogMonitoring.dumpTailOfLogs(out, tailKb);

        out.println("\n\nFS Queue:");
        out.println(LINE);
        if (isShowQueueDump(hrsconf)) {
            dumpQueue(fs, out);
        }

        out.flush();
    }

    private boolean isShowQueueDump(Configuration conf) {
        return conf.getBoolean("wasp.fserver.servlet.show.queuedump", true);
    }

    private void dumpQueue(FServer fs, PrintWriter out) throws IOException {
        // 1. Print out Compaction/Split Queue
        out.println("Split Queue summary: " + fs.splitThread.toString());
        out.println(fs.splitThread.dumpQueue());

    }

}