Myasuka commented on a change in pull request #19033: URL: https://github.com/apache/flink/pull/19033#discussion_r829757672
########## File path: flink-tests/src/test/java/org/apache/flink/test/checkpointing/RescaleCheckpointManuallyITCase.java ########## @@ -0,0 +1,314 @@ +/* + * 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.flink.test.checkpointing; + +import org.apache.flink.api.common.restartstrategy.RestartStrategies; +import org.apache.flink.api.java.functions.KeySelector; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.client.program.ClusterClient; +import org.apache.flink.configuration.CheckpointingOptions; +import org.apache.flink.configuration.Configuration; +import org.apache.flink.configuration.StateBackendOptions; +import org.apache.flink.runtime.jobgraph.JobGraph; +import org.apache.flink.runtime.jobgraph.JobVertex; +import org.apache.flink.runtime.jobgraph.SavepointRestoreSettings; +import org.apache.flink.runtime.state.KeyGroupRangeAssignment; +import org.apache.flink.runtime.testutils.MiniClusterResourceConfiguration; +import org.apache.flink.streaming.api.datastream.DataStream; +import org.apache.flink.streaming.api.environment.CheckpointConfig; +import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; +import org.apache.flink.test.checkpointing.utils.RescalingTestUtils; +import org.apache.flink.test.util.MiniClusterWithClientResource; +import org.apache.flink.test.util.TestUtils; + +import org.junit.Before; +import org.junit.ClassRule; +import org.junit.Test; +import org.junit.rules.TemporaryFolder; + +import java.io.File; +import java.io.IOException; +import java.util.HashSet; +import java.util.Optional; +import java.util.Set; +import java.util.concurrent.CountDownLatch; + +import static org.apache.flink.test.util.TestUtils.submitJobAndWaitForResult; +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertNotNull; + +/** Test checkpoint rescaling for incremental rocksdb. */ +public class RescaleCheckpointManuallyITCase { + + private static final int NUM_TASK_MANAGERS = 2; + private static final int SLOTS_PER_TASK_MANAGER = 2; + + private static MiniClusterWithClientResource cluster; + private File checkpointDir; + + @ClassRule public static TemporaryFolder temporaryFolder = new TemporaryFolder(); + + @Before + public void setup() throws Exception { + Configuration config = new Configuration(); + + checkpointDir = temporaryFolder.newFolder(); + + config.setString(StateBackendOptions.STATE_BACKEND, "rocksdb"); + config.setString( + CheckpointingOptions.CHECKPOINTS_DIRECTORY, checkpointDir.toURI().toString()); + config.setBoolean(CheckpointingOptions.INCREMENTAL_CHECKPOINTS, true); + + cluster = + new MiniClusterWithClientResource( + new MiniClusterResourceConfiguration.Builder() + .setConfiguration(config) + .setNumberTaskManagers(NUM_TASK_MANAGERS) + .setNumberSlotsPerTaskManager(SLOTS_PER_TASK_MANAGER) + .build()); + cluster.before(); + } + + @Test + public void testCheckpointRescalingInKeyedState() throws Exception { + testCheckpointRescalingKeyedState(false, false); + } + + @Test + public void testCheckpointRescalingOutKeyedState() throws Exception { + testCheckpointRescalingKeyedState(true, false); + } + + @Test + public void testCheckpointRescalingInKeyedStateDerivedMaxParallelism() throws Exception { + testCheckpointRescalingKeyedState(false, true); + } + + @Test + public void testCheckpointRescalingOutKeyedStateDerivedMaxParallelism() throws Exception { + testCheckpointRescalingKeyedState(true, true); + } Review comment: I think tests of rescale in and out is enough here. ########## File path: flink-tests/src/test/java/org/apache/flink/test/checkpointing/RescaleCheckpointManuallyITCase.java ########## @@ -0,0 +1,314 @@ +/* + * 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.flink.test.checkpointing; + +import org.apache.flink.api.common.restartstrategy.RestartStrategies; +import org.apache.flink.api.java.functions.KeySelector; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.client.program.ClusterClient; +import org.apache.flink.configuration.CheckpointingOptions; +import org.apache.flink.configuration.Configuration; +import org.apache.flink.configuration.StateBackendOptions; +import org.apache.flink.runtime.jobgraph.JobGraph; +import org.apache.flink.runtime.jobgraph.JobVertex; +import org.apache.flink.runtime.jobgraph.SavepointRestoreSettings; +import org.apache.flink.runtime.state.KeyGroupRangeAssignment; +import org.apache.flink.runtime.testutils.MiniClusterResourceConfiguration; +import org.apache.flink.streaming.api.datastream.DataStream; +import org.apache.flink.streaming.api.environment.CheckpointConfig; +import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; +import org.apache.flink.test.checkpointing.utils.RescalingTestUtils; +import org.apache.flink.test.util.MiniClusterWithClientResource; +import org.apache.flink.test.util.TestUtils; + +import org.junit.Before; +import org.junit.ClassRule; +import org.junit.Test; +import org.junit.rules.TemporaryFolder; + +import java.io.File; +import java.io.IOException; +import java.util.HashSet; +import java.util.Optional; +import java.util.Set; +import java.util.concurrent.CountDownLatch; + +import static org.apache.flink.test.util.TestUtils.submitJobAndWaitForResult; +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertNotNull; + +/** Test checkpoint rescaling for incremental rocksdb. */ +public class RescaleCheckpointManuallyITCase { Review comment: This test should extend `TestLogger`. ########## File path: flink-tests/src/test/java/org/apache/flink/test/checkpointing/RescaleCheckpointManuallyITCase.java ########## @@ -0,0 +1,314 @@ +/* + * 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.flink.test.checkpointing; + +import org.apache.flink.api.common.restartstrategy.RestartStrategies; +import org.apache.flink.api.java.functions.KeySelector; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.client.program.ClusterClient; +import org.apache.flink.configuration.CheckpointingOptions; +import org.apache.flink.configuration.Configuration; +import org.apache.flink.configuration.StateBackendOptions; +import org.apache.flink.runtime.jobgraph.JobGraph; +import org.apache.flink.runtime.jobgraph.JobVertex; +import org.apache.flink.runtime.jobgraph.SavepointRestoreSettings; +import org.apache.flink.runtime.state.KeyGroupRangeAssignment; +import org.apache.flink.runtime.testutils.MiniClusterResourceConfiguration; +import org.apache.flink.streaming.api.datastream.DataStream; +import org.apache.flink.streaming.api.environment.CheckpointConfig; +import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; +import org.apache.flink.test.checkpointing.utils.RescalingTestUtils; +import org.apache.flink.test.util.MiniClusterWithClientResource; +import org.apache.flink.test.util.TestUtils; + +import org.junit.Before; +import org.junit.ClassRule; +import org.junit.Test; +import org.junit.rules.TemporaryFolder; + +import java.io.File; +import java.io.IOException; +import java.util.HashSet; +import java.util.Optional; +import java.util.Set; +import java.util.concurrent.CountDownLatch; + +import static org.apache.flink.test.util.TestUtils.submitJobAndWaitForResult; +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertNotNull; + +/** Test checkpoint rescaling for incremental rocksdb. */ +public class RescaleCheckpointManuallyITCase { + + private static final int NUM_TASK_MANAGERS = 2; + private static final int SLOTS_PER_TASK_MANAGER = 2; + + private static MiniClusterWithClientResource cluster; + private File checkpointDir; + + @ClassRule public static TemporaryFolder temporaryFolder = new TemporaryFolder(); + + @Before + public void setup() throws Exception { + Configuration config = new Configuration(); + + checkpointDir = temporaryFolder.newFolder(); + + config.setString(StateBackendOptions.STATE_BACKEND, "rocksdb"); + config.setString( + CheckpointingOptions.CHECKPOINTS_DIRECTORY, checkpointDir.toURI().toString()); + config.setBoolean(CheckpointingOptions.INCREMENTAL_CHECKPOINTS, true); + + cluster = + new MiniClusterWithClientResource( + new MiniClusterResourceConfiguration.Builder() + .setConfiguration(config) + .setNumberTaskManagers(NUM_TASK_MANAGERS) + .setNumberSlotsPerTaskManager(SLOTS_PER_TASK_MANAGER) + .build()); + cluster.before(); + } + + @Test + public void testCheckpointRescalingInKeyedState() throws Exception { + testCheckpointRescalingKeyedState(false, false); + } + + @Test + public void testCheckpointRescalingOutKeyedState() throws Exception { + testCheckpointRescalingKeyedState(true, false); + } + + @Test + public void testCheckpointRescalingInKeyedStateDerivedMaxParallelism() throws Exception { + testCheckpointRescalingKeyedState(false, true); + } + + @Test + public void testCheckpointRescalingOutKeyedStateDerivedMaxParallelism() throws Exception { + testCheckpointRescalingKeyedState(true, true); + } + + /** + * Tests that a job with purely keyed state can be restarted from a checkpoint with a different + * parallelism. + */ + public void testCheckpointRescalingKeyedState(boolean scaleOut, boolean deriveMaxParallelism) + throws Exception { + final int numberKeys = 42; + final int numberElements = 1000; + final int numberElements2 = 500; + final int parallelism = scaleOut ? 3 : 4; + final int parallelism2 = scaleOut ? 4 : 3; + final int maxParallelism = 13; + + cluster.before(); + + ClusterClient<?> client = cluster.getClusterClient(); + String checkpointPath = + runJobAndGetCheckpoint( + numberKeys, + numberElements, + parallelism, + maxParallelism, + client, + checkpointDir); + + assertNotNull(checkpointPath); + + int restoreMaxParallelism = + deriveMaxParallelism ? JobVertex.MAX_PARALLELISM_DEFAULT : maxParallelism; + + restoreAndAssert( + parallelism2, + restoreMaxParallelism, + maxParallelism, + numberKeys, + numberElements2, + numberElements + numberElements2, + client, + checkpointPath); + } + + private static String runJobAndGetCheckpoint( + int numberKeys, + int numberElements, + int parallelism, + int maxParallelism, + ClusterClient<?> client, + File checkpointDir) + throws Exception { + try { + JobGraph jobGraph = + createJobGraphWithKeyedState( + parallelism, maxParallelism, numberKeys, numberElements, false, 100); + NotifyingDefiniteKeySource.countDownLatch = new CountDownLatch(parallelism); + client.submitJob(jobGraph).get(); + NotifyingDefiniteKeySource.countDownLatch.await(); + + RescalingTestUtils.SubtaskIndexFlatMapper.workCompletedLatch.await(); + + // verify the current state + Set<Tuple2<Integer, Integer>> actualResult = + RescalingTestUtils.CollectionSink.getElementsSet(); + + Set<Tuple2<Integer, Integer>> expectedResult = new HashSet<>(); + + for (int key = 0; key < numberKeys; key++) { + int keyGroupIndex = KeyGroupRangeAssignment.assignToKeyGroup(key, maxParallelism); + expectedResult.add( + Tuple2.of( + KeyGroupRangeAssignment.computeOperatorIndexForKeyGroup( + maxParallelism, parallelism, keyGroupIndex), + numberElements * key)); + } + + assertEquals(expectedResult, actualResult); + NotifyingDefiniteKeySource.countDownLatch.await(); + + waitUntilExternalizedCheckpointCreated(checkpointDir); + client.cancel(jobGraph.getJobID()).get(); + TestUtils.waitUntilCanceled(jobGraph.getJobID(), client); + return TestUtils.getMostRecentCompletedCheckpoint(checkpointDir).getAbsolutePath(); + } finally { + RescalingTestUtils.CollectionSink.clearElementsSet(); + } + } + + private void restoreAndAssert( + int restoreParallelism, + int restoreMaxParallelism, + int maxParallelismBefore, + int numberKeys, + int numberElements, + int numberElementsExpect, + ClusterClient<?> client, + String restorePath) + throws Exception { + try { + + JobGraph scaledJobGraph = + createJobGraphWithKeyedState( + restoreParallelism, + restoreMaxParallelism, + numberKeys, + numberElements, + true, + 100); + + scaledJobGraph.setSavepointRestoreSettings( + SavepointRestoreSettings.forPath(restorePath)); + + submitJobAndWaitForResult(client, scaledJobGraph, getClass().getClassLoader()); + + Set<Tuple2<Integer, Integer>> actualResult2 = + RescalingTestUtils.CollectionSink.getElementsSet(); + + Set<Tuple2<Integer, Integer>> expectedResult2 = new HashSet<>(); + + for (int key = 0; key < numberKeys; key++) { + int keyGroupIndex = + KeyGroupRangeAssignment.assignToKeyGroup(key, maxParallelismBefore); + expectedResult2.add( + Tuple2.of( + KeyGroupRangeAssignment.computeOperatorIndexForKeyGroup( + maxParallelismBefore, restoreParallelism, keyGroupIndex), + key * numberElementsExpect)); + } + assertEquals(expectedResult2, actualResult2); + } finally { + RescalingTestUtils.CollectionSink.clearElementsSet(); + } + } + + private static void waitUntilExternalizedCheckpointCreated(File checkpointDir) + throws InterruptedException, IOException { + while (true) { + Thread.sleep(50); + Optional<File> externalizedCheckpoint = + TestUtils.getMostRecentCompletedCheckpointMaybe(checkpointDir); + if (externalizedCheckpoint.isPresent()) { + break; + } + } + } Review comment: We can place this helper in `TestUtils` so that both `ResumeCheckpointManuallyITCase` and `RescaleCheckpointManuallyITCase` could use. ########## File path: flink-tests/src/test/java/org/apache/flink/test/checkpointing/utils/RescalingTestUtils.java ########## @@ -0,0 +1,171 @@ +/* + * 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.flink.test.checkpointing.utils; + +import org.apache.flink.api.common.functions.RichFlatMapFunction; +import org.apache.flink.api.common.state.CheckpointListener; +import org.apache.flink.api.common.state.ValueState; +import org.apache.flink.api.common.state.ValueStateDescriptor; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.runtime.state.FunctionInitializationContext; +import org.apache.flink.runtime.state.FunctionSnapshotContext; +import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction; +import org.apache.flink.streaming.api.functions.sink.SinkFunction; +import org.apache.flink.streaming.api.functions.source.RichParallelSourceFunction; +import org.apache.flink.util.Collector; + +import java.util.Collections; +import java.util.Set; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.CountDownLatch; +import java.util.concurrent.atomic.AtomicInteger; + +/** Test utilities for rescaling. */ +public class RescalingTestUtils { + + /** A parallel source with definite keys. */ + public static class DefiniteKeySource extends RichParallelSourceFunction<Integer> { + + private static final long serialVersionUID = -400066323594122516L; + + private final int numberKeys; + private final int numberElements; + private final boolean terminateAfterEmission; + + protected int counter = 0; + + private boolean running = true; + + public DefiniteKeySource( + int numberKeys, int numberElements, boolean terminateAfterEmission) { + this.numberKeys = numberKeys; + this.numberElements = numberElements; + this.terminateAfterEmission = terminateAfterEmission; + } + + @Override + public void run(SourceContext<Integer> ctx) throws Exception { + final Object lock = ctx.getCheckpointLock(); + final int subtaskIndex = getRuntimeContext().getIndexOfThisSubtask(); + while (running) { + + if (counter < numberElements) { + synchronized (lock) { + for (int value = subtaskIndex; + value < numberKeys; + value += getRuntimeContext().getNumberOfParallelSubtasks()) { + ctx.collect(value); + } + counter++; + } + } else { + if (terminateAfterEmission) { + running = false; + } else { + Thread.sleep(100); + } + } + } + } + + @Override + public void cancel() { + running = false; + } + } + + /** A flatMapper with the index of subtask. */ + public static class SubtaskIndexFlatMapper + extends RichFlatMapFunction<Integer, Tuple2<Integer, Integer>> + implements CheckpointedFunction, CheckpointListener { + + private static final long serialVersionUID = 5273172591283191348L; + + public static CountDownLatch workCompletedLatch = new CountDownLatch(1); + private static AtomicInteger completedCheckpointNum; Review comment: There is no need to make `completedCheckpointNum` as static. ########## File path: flink-tests/src/test/java/org/apache/flink/test/checkpointing/utils/RescalingTestUtils.java ########## @@ -0,0 +1,171 @@ +/* + * 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.flink.test.checkpointing.utils; + +import org.apache.flink.api.common.functions.RichFlatMapFunction; +import org.apache.flink.api.common.state.CheckpointListener; +import org.apache.flink.api.common.state.ValueState; +import org.apache.flink.api.common.state.ValueStateDescriptor; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.runtime.state.FunctionInitializationContext; +import org.apache.flink.runtime.state.FunctionSnapshotContext; +import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction; +import org.apache.flink.streaming.api.functions.sink.SinkFunction; +import org.apache.flink.streaming.api.functions.source.RichParallelSourceFunction; +import org.apache.flink.util.Collector; + +import java.util.Collections; +import java.util.Set; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.CountDownLatch; +import java.util.concurrent.atomic.AtomicInteger; + +/** Test utilities for rescaling. */ +public class RescalingTestUtils { + + /** A parallel source with definite keys. */ + public static class DefiniteKeySource extends RichParallelSourceFunction<Integer> { + + private static final long serialVersionUID = -400066323594122516L; + + private final int numberKeys; + private final int numberElements; + private final boolean terminateAfterEmission; + + protected int counter = 0; + + private boolean running = true; + + public DefiniteKeySource( + int numberKeys, int numberElements, boolean terminateAfterEmission) { + this.numberKeys = numberKeys; + this.numberElements = numberElements; + this.terminateAfterEmission = terminateAfterEmission; + } + + @Override + public void run(SourceContext<Integer> ctx) throws Exception { + final Object lock = ctx.getCheckpointLock(); + final int subtaskIndex = getRuntimeContext().getIndexOfThisSubtask(); + while (running) { + + if (counter < numberElements) { + synchronized (lock) { + for (int value = subtaskIndex; + value < numberKeys; + value += getRuntimeContext().getNumberOfParallelSubtasks()) { + ctx.collect(value); + } + counter++; + } + } else { + if (terminateAfterEmission) { + running = false; + } else { + Thread.sleep(100); + } + } + } + } + + @Override + public void cancel() { + running = false; + } + } + + /** A flatMapper with the index of subtask. */ + public static class SubtaskIndexFlatMapper + extends RichFlatMapFunction<Integer, Tuple2<Integer, Integer>> + implements CheckpointedFunction, CheckpointListener { + + private static final long serialVersionUID = 5273172591283191348L; + + public static CountDownLatch workCompletedLatch = new CountDownLatch(1); + private static AtomicInteger completedCheckpointNum; + + private transient ValueState<Integer> counter; + private transient ValueState<Integer> sum; + + private final int numberElements; + + public SubtaskIndexFlatMapper(int numberElements) { + this.numberElements = numberElements; + this.completedCheckpointNum = new AtomicInteger(); + } + + @Override + public void flatMap(Integer value, Collector<Tuple2<Integer, Integer>> out) + throws Exception { + + int count = counter.value() + 1; + counter.update(count); + + int s = sum.value() + value; + sum.update(s); + + if (count % numberElements == 0) { + out.collect(Tuple2.of(getRuntimeContext().getIndexOfThisSubtask(), s)); + workCompletedLatch.countDown(); + } + } + + @Override + public void snapshotState(FunctionSnapshotContext context) throws Exception { + // all managed, nothing to do. + } + + @Override + public void initializeState(FunctionInitializationContext context) throws Exception { + counter = + context.getKeyedStateStore() + .getState(new ValueStateDescriptor<>("counter", Integer.class, 0)); + sum = + context.getKeyedStateStore() + .getState(new ValueStateDescriptor<>("sum", Integer.class, 0)); + } + + @Override + public void notifyCheckpointComplete(long checkpointId) throws Exception { + completedCheckpointNum.getAndIncrement(); + } + } + + /** Sink for collecting results into a collection. */ + public static class CollectionSink<IN> implements SinkFunction<IN> { + + private static Set<Object> elements = + Collections.newSetFromMap(new ConcurrentHashMap<Object, Boolean>()); Review comment: ```suggestion private static final Set<Object> elements = Collections.newSetFromMap(new ConcurrentHashMap<>()); ``` ########## File path: flink-tests/src/test/java/org/apache/flink/test/util/TestUtils.java ########## @@ -139,4 +142,11 @@ private static boolean hasMetadata(Path file) { return false; // should never happen } } + + public static void waitUntilCanceled(JobID jobId, ClusterClient<?> client) Review comment: I think `waitUntilJobCanceled` looks better. -- This is an automated message from the Apache Git Service. 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