[GitHub] phoenix pull request #359: PHOENIX-4764 - Cleanup metadata of child views fo...

[twdsilva <gi...@git.apache.org>]

Github user twdsilva commented on a diff in the pull request:

    https://github.com/apache/phoenix/pull/359#discussion_r221773024
  
    --- Diff: phoenix-core/src/main/java/org/apache/phoenix/coprocessor/TaskRegionObserver.java ---
    @@ -0,0 +1,240 @@
    +/*
    + * 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.phoenix.coprocessor;
    +
    +import java.io.IOException;
    +import java.sql.PreparedStatement;
    +import java.sql.ResultSet;
    +import java.sql.SQLException;
    +import java.sql.Timestamp;
    +import java.sql.Types;
    +
    +import java.util.Optional;
    +import java.util.Properties;
    +import java.util.TimerTask;
    +import java.util.concurrent.ScheduledThreadPoolExecutor;
    +import java.util.concurrent.TimeUnit;
    +
    +import javax.annotation.concurrent.GuardedBy;
    +
    +import org.apache.commons.logging.Log;
    +import org.apache.commons.logging.LogFactory;
    +import org.apache.hadoop.conf.Configuration;
    +import org.apache.hadoop.hbase.CoprocessorEnvironment;
    +import org.apache.hadoop.hbase.coprocessor.ObserverContext;
    +import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;
    +import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
    +import org.apache.hadoop.hbase.coprocessor.RegionObserver;
    +import org.apache.log4j.Level;
    +import org.apache.log4j.Logger;
    +import org.apache.phoenix.cache.GlobalCache;
    +import org.apache.phoenix.jdbc.PhoenixConnection;
    +import org.apache.phoenix.jdbc.PhoenixDatabaseMetaData;
    +import org.apache.phoenix.jdbc.PhoenixDriver;
    +import org.apache.phoenix.query.QueryServices;
    +import org.apache.phoenix.query.QueryServicesOptions;
    +import org.apache.phoenix.schema.MetaDataClient;
    +import org.apache.phoenix.schema.PTable;
    +import org.apache.phoenix.schema.PTable.TaskType;
    +
    +import org.apache.phoenix.util.PhoenixRuntime;
    +import org.apache.phoenix.util.QueryUtil;
    +
    +
    +/**
    + * Coprocessor for task related operations. This coprocessor would only be registered
    + * to SYSTEM.TASK table
    + */
    +@SuppressWarnings("deprecation")
    +public class TaskRegionObserver implements RegionObserver, RegionCoprocessor {
    +    public static final Log LOG = LogFactory.getLog(TaskRegionObserver.class);
    +    protected ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(TaskType.values().length);
    +    private long timeInterval = QueryServicesOptions.DEFAULT_TASK_HANDLING_INTERVAL;
    +    private long timeMaxInterval = QueryServicesOptions.DEFAULT_TASK_HANDLING_MAX_INTERVAL;
    +    @GuardedBy("TaskRegionObserver.class")
    +    // Added for test purposes
    +    private long initialDelay = 0;
    +
    +    @Override
    +    public void preClose(final ObserverContext<RegionCoprocessorEnvironment> c,
    +            boolean abortRequested) {
    +        executor.shutdownNow();
    +        GlobalCache.getInstance(c.getEnvironment()).getMetaDataCache().invalidateAll();
    +    }
    +
    +    @Override
    +    public Optional<RegionObserver> getRegionObserver() {
    +        return Optional.of(this);
    +    }
    +
    +    @Override
    +    public void start(CoprocessorEnvironment env) throws IOException {
    +        // sleep a little bit to compensate time clock skew when SYSTEM.CATALOG moves
    +        // among region servers because we relies on server time of RS which is hosting
    +        // SYSTEM.CATALOG
    +        Configuration config = env.getConfiguration();
    --- End diff --
    
    Same here, is this really needed?


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