Github user tnine commented on a diff in the pull request:
https://github.com/apache/incubator-usergrid/pull/307#discussion_r34699249
--- Diff:
stack/tools/src/main/java/org/apache/usergrid/tools/ExportApp.java ---
@@ -0,0 +1,552 @@
+/*
+ * 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.usergrid.tools;
+
+import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.Option;
+import org.apache.commons.cli.OptionBuilder;
+import org.apache.commons.cli.Options;
+import org.apache.usergrid.persistence.Entity;
+import org.apache.usergrid.persistence.EntityManager;
+import org.apache.usergrid.persistence.Query;
+import org.apache.usergrid.persistence.Results;
+import org.apache.usergrid.utils.StringUtils;
+import org.codehaus.jackson.JsonGenerator;
+import org.codehaus.jackson.map.ObjectMapper;
+import org.codehaus.jackson.util.MinimalPrettyPrinter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import rx.Observable;
+import rx.Scheduler;
+import rx.Subscriber;
+import rx.functions.Action0;
+import rx.functions.Action1;
+import rx.functions.Func1;
+import rx.schedulers.Schedulers;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.*;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.atomic.AtomicInteger;
+
+
+/**
+ * Export all entities and connections of a Usergrid app.
+ *
+ * Exports data files to specified directory.
+ *
+ * Will create as many output files as there are writeThreads (by default:
10).
+ *
+ * Will create two types of files: *.uge for Usegrird entities and *.ugc
for entity to entity connections.
+ *
+ * Every line of the data files is a complete JSON object.
+ */
+public class ExportApp extends ExportingToolBase {
+ static final Logger logger = LoggerFactory.getLogger( ExportApp.class
);
+
+ static final String APPLICATION_NAME = "application";
+ private static final String READ_THREAD_COUNT = "readThreads";
+ private static final String WRITE_THREAD_COUNT = "writeThreads";
+
+ String applicationName;
+ String organizationName;
+
+ AtomicInteger entitiesWritten = new AtomicInteger(0);
+ AtomicInteger connectionsWritten = new AtomicInteger(0);
+
+ Scheduler readScheduler;
+ Scheduler writeScheduler;
+
+ ObjectMapper mapper = new ObjectMapper();
+ Map<Thread, JsonGenerator> entityGeneratorsByThread = new
HashMap<Thread, JsonGenerator>();
+ Map<Thread, JsonGenerator> connectionGeneratorsByThread = new
HashMap<Thread, JsonGenerator>();
+
+ // set via CLI
+ int readThreadCount = 80;
+ int writeThreadCount = 10; // limiting write will limit output files
+
+
+ @Override
+ @SuppressWarnings("static-access")
+ public Options createOptions() {
+
+ Options options = super.createOptions();
+
+ Option appNameOption = OptionBuilder.hasArg().withType("")
+ .withDescription( "Application Name -" + APPLICATION_NAME
).create( APPLICATION_NAME );
+ options.addOption( appNameOption );
+
+ Option readThreadsOption = OptionBuilder.hasArg().withType(0)
+ .withDescription( "Read Threads -" + READ_THREAD_COUNT
).create( READ_THREAD_COUNT );
+ options.addOption( readThreadsOption );
+
+ Option writeThreadsOption = OptionBuilder.hasArg().withType(0)
+ .withDescription( "Write Threads -" + WRITE_THREAD_COUNT
).create(WRITE_THREAD_COUNT);
+ options.addOption( writeThreadsOption );
+
+ return options;
+ }
+
+
+ /**
+ * Tool entry point.
+ */
+ @Override
+ public void runTool(CommandLine line) throws Exception {
+
+ applicationName = line.getOptionValue( APPLICATION_NAME );
+
+ if (StringUtils.isNotEmpty( line.getOptionValue( READ_THREAD_COUNT
) )) {
+ try {
+ readThreadCount = Integer.parseInt( line.getOptionValue(
READ_THREAD_COUNT ) );
+ } catch (NumberFormatException nfe) {
+ logger.error( "-" + READ_THREAD_COUNT + " must be
specified as an integer. Aborting..." );
+ return;
+ }
+ }
+
+ if (StringUtils.isNotEmpty( line.getOptionValue(
WRITE_THREAD_COUNT ) )) {
+ try {
+ writeThreadCount = Integer.parseInt( line.getOptionValue(
WRITE_THREAD_COUNT ) );
+ } catch (NumberFormatException nfe) {
+ logger.error( "-" + WRITE_THREAD_COUNT + " must be
specified as an integer. Aborting..." );
+ return;
+ }
+ }
+
+ setVerbose( line );
+
+ applyOrgId( line );
+ prepareBaseOutputFileName( line );
+ outputDir = createOutputParentDir();
+ logger.info( "Export directory: " + outputDir.getAbsolutePath() );
+
+ startSpring();
+
+ UUID applicationId = emf.lookupApplication( applicationName );
+ final EntityManager em = emf.getEntityManager( applicationId );
+ organizationName = em.getApplication().getOrganizationName();
+
+ ExecutorService readThreadPoolExecutor =
Executors.newFixedThreadPool( readThreadCount );
+ readScheduler = Schedulers.from( readThreadPoolExecutor );
+
+ ExecutorService writeThreadPoolExecutor =
Executors.newFixedThreadPool( writeThreadCount );
+ writeScheduler = Schedulers.from( writeThreadPoolExecutor );
+
+ Observable<String> collectionsObservable = Observable.create( new
CollectionsObservable( em ) );
+
+ collectionsObservable.flatMap( new Func1<String,
Observable<ExportEntity>>() {
+
+ public Observable<ExportEntity> call(String collection) {
+ return Observable.create( new EntityObservable( em,
collection ))
+ .doOnNext( new EntityWriteAction() ).subscribeOn(
writeScheduler );
+ }
+
+ }, 10).flatMap( new Func1<ExportEntity,
Observable<ExportConnection>>() {
--- End diff --
Rather than have a static 10 here, we should probably use the
Schedulers.io() scheduler, then use the write thread count as this value.
Otherwise you'll just introduce contention on a thread pool. If we use the
unbounded Schedulers.io(), and us the size as the flatmap argument, we'll never
exceed the set thread size.
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