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HDFS-14250. [SBN read]. msync should always direct to active NameNode to get latest stateID. Contributed by Chao Sun.

This commit is contained in:
Erik Krogen 2019-02-06 09:54:47 -08:00
parent 711d22f166
commit d3de8e162b
2 changed files with 47 additions and 2 deletions
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2
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/ClientProtocol.java
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@ -1808,7 +1808,7 @@ public interface ClientProtocol {
* @throws IOException
*/
@Idempotent
@ReadOnly(isCoordinated = true)
@ReadOnly(activeOnly = true)
void msync() throws IOException;
/**

47
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestConsistentReadsObserver.java
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@ -26,6 +26,7 @@ import java.util.concurrent.atomic.AtomicInteger;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.DistributedFileSystem;
@ -150,7 +151,51 @@ public class TestConsistentReadsObserver {
assertEquals(1, readStatus.get());
}
// @Ignore("Move to another test file")
@Test
public void testMsync() throws Exception {
// 0 == not completed, 1 == succeeded, -1 == failed
AtomicInteger readStatus = new AtomicInteger(0);
Configuration conf2 = new Configuration(conf);
// Disable FS cache so two different DFS clients will be used.
conf2.setBoolean("fs.hdfs.impl.disable.cache", true);
DistributedFileSystem dfs2 = (DistributedFileSystem) FileSystem.get(conf2);
// Initialize the proxies for Observer Node.
dfs.getClient().getHAServiceState();
dfs2.getClient().getHAServiceState();
// Advance Observer's state ID so it is ahead of client's.
dfs.mkdir(new Path("/test"), FsPermission.getDefault());
dfsCluster.rollEditLogAndTail(0);
dfs.mkdir(testPath, FsPermission.getDefault());
assertSentTo(0);
Thread reader = new Thread(() -> {
try {
// After msync, client should have the latest state ID from active.
// Therefore, the subsequent getFileStatus call should succeed.
dfs2.getClient().msync();
dfs2.getFileStatus(testPath);
readStatus.set(1);
} catch (IOException e) {
e.printStackTrace();
readStatus.set(-1);
}
});
reader.start();
Thread.sleep(100);
assertEquals(0, readStatus.get());
dfsCluster.rollEditLogAndTail(0);
GenericTestUtils.waitFor(() -> readStatus.get() != 0, 100, 10000);
assertEquals(1, readStatus.get());
}
@Test
public void testUncoordinatedCall() throws Exception {
// make a write call so that client will be ahead of