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From justinleet <>
Subject [GitHub] incubator-metron pull request #421: METRON-283 Migrate Geo Enrichment outsid...
Date Wed, 25 Jan 2017 17:02:36 GMT
Github user justinleet commented on a diff in the pull request:
    --- Diff: metron-platform/metron-enrichment/src/main/java/org/apache/metron/enrichment/adapters/geo/
    @@ -0,0 +1,184 @@
    + * 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
    + *
    + *
    + *
    + * 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.metron.enrichment.adapters.geo;
    +import com.maxmind.db.CHMCache;
    +import com.maxmind.geoip2.DatabaseReader;
    +import com.maxmind.geoip2.exception.GeoIp2Exception;
    +import com.maxmind.geoip2.model.CityResponse;
    +import com.maxmind.geoip2.record.City;
    +import com.maxmind.geoip2.record.Country;
    +import com.maxmind.geoip2.record.Location;
    +import com.maxmind.geoip2.record.Postal;
    +import org.apache.commons.validator.routines.InetAddressValidator;
    +import org.apache.hadoop.conf.Configuration;
    +import org.apache.hadoop.fs.FileSystem;
    +import org.apache.hadoop.fs.Path;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +import java.util.HashMap;
    +import java.util.Map;
    +import java.util.Optional;
    +import java.util.concurrent.locks.Lock;
    +import java.util.concurrent.locks.ReentrantReadWriteLock;
    +public enum GeoLiteDatabase {
    +  INSTANCE;
    --- End diff --
    It's primary because the database file could be used and accessed by multiple threads
of execution, depending on Storm's parallelism. If multiple tasks are running, they could
potentially start stomping on each other's data.
    The burden shouldn't be bad, because it primarily consists of reading.  The alternative
is having to manage potentially every thread pulling down it's own version of the file and
loading it while avoiding tripping up other threads.
    Having said that, I am definitely open to other ideas if we have good alternatives.

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