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https://issues.apache.org/jira/browse/FLINK-10461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16667355#comment-16667355
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ASF GitHub Bot commented on FLINK-10461:
----------------------------------------
azagrebin commented on a change in pull request #6777: [FLINK-10461] [State
Backends, Checkpointing] Speed up download files when restore from DFS
URL: https://github.com/apache/flink/pull/6777#discussion_r228976096
##########
File path:
flink-state-backends/flink-statebackend-rocksdb/src/test/java/org/apache/flink/contrib/streaming/state/RocksDBStateDataTransferTest.java
##########
@@ -0,0 +1,143 @@
+/*
+ * 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.contrib.streaming.state;
+
+import org.apache.flink.core.fs.CloseableRegistry;
+import org.apache.flink.core.fs.FileSystem;
+import org.apache.flink.core.fs.Path;
+import org.apache.flink.runtime.state.IncrementalKeyedStateHandle;
+import org.apache.flink.runtime.state.StateHandleID;
+import org.apache.flink.runtime.state.StreamStateHandle;
+import org.apache.flink.runtime.state.memory.ByteStreamStateHandle;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Random;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+/**
+ * Tests for RocksDbStateDataTransfer.
+ */
+public class RocksDBStateDataTransferTest {
+ @Rule
+ public TemporaryFolder temporaryFolder = new TemporaryFolder();
+
+ /**
+ * Test that the exception arose in the thread pool will rethrow to the
main thread.
+ */
+ @Test
+ public void testThreadPoolExceptionRethrow() throws Exception {
+ IncrementalKeyedStateHandle stateHandle =
mock(IncrementalKeyedStateHandle.class);
+
+ SpecifiedException expectedException = new
SpecifiedException("throw exception while multi thread restore.");
+ StreamStateHandle mockStateHandle =
mock(StreamStateHandle.class);
+
when(mockStateHandle.openInputStream()).thenThrow(expectedException);
+
+ Map<StateHandleID, StreamStateHandle> sharedStateHandle = new
HashMap<>(1);
+ sharedStateHandle.put(new StateHandleID("mock"),
mockStateHandle);
+
when(stateHandle.getSharedState()).thenReturn(sharedStateHandle);
+
+ try {
+
RocksDbStateDataTransfer.transferAllStateDataToDirectory(stateHandle, new
Path(temporaryFolder.newFolder().toURI()), 5, new CloseableRegistry());
+ fail();
+ } catch (Exception e) {
+ assertEquals(expectedException,
e.getCause().getCause());
+ }
+ }
+
+ /**
+ * Tests that download files with multi-thread correctly.
+ * @throws Exception
+ */
+ @Test
+ public void testMultiThreadRestoreCorrectly() throws Exception {
+ IncrementalKeyedStateHandle stateHandle =
mock(IncrementalKeyedStateHandle.class);
+
+ byte[] content1 = new byte[1];
Review comment:
I would create a list of something like 6 test contexts and use loops over
them for further actions.
content length can be also random.
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> Speed up download file procedure when restore
> ----------------------------------------------
>
> Key: FLINK-10461
> URL: https://issues.apache.org/jira/browse/FLINK-10461
> Project: Flink
> Issue Type: Improvement
> Components: State Backends, Checkpointing
> Reporter: Congxian Qiu
> Assignee: Congxian Qiu
> Priority: Major
> Labels: pull-request-available
>
> In the current master branch, the restore will download file from DFS, the
> download procedure are single-thread, this could speed up by using
> multi-thread for downloading states from DFS.
>
> In my company, the states will come to some terabytes, so the restore
> procedure will become a litter slow, after a bit digging, I find download
> states from DFS using single thread, this could using multi-thread for speed
> up.
> I test the time used for download states from DFS with ~2 terabytes states.
> With single thread it used 640+s, and 130+s when using 5 threads for download.
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