HDFS-12730. Verify open files captured in the snapshots across config disable and enable.

This commit is contained in:
Manoj Govindassamy 2017-11-20 10:28:12 -08:00
parent 6f9d7a146d
commit 9fb4effd2c
2 changed files with 124 additions and 1 deletions

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@ -35,6 +35,7 @@ import java.util.concurrent.atomic.AtomicInteger;
import javax.management.ObjectName;
import com.google.common.annotations.VisibleForTesting;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
@ -75,7 +76,7 @@ public class SnapshotManager implements SnapshotStatsMXBean {
public static final Log LOG = LogFactory.getLog(SnapshotManager.class);
private final FSDirectory fsdir;
private final boolean captureOpenFiles;
private boolean captureOpenFiles;
/**
* If skipCaptureAccessTimeOnlyChange is set to true, if accessTime
* of a file changed but there is no other modification made to the file,
@ -121,6 +122,11 @@ public class SnapshotManager implements SnapshotStatsMXBean {
+ snapshotDiffAllowSnapRootDescendant);
}
@VisibleForTesting
void setCaptureOpenFiles(boolean captureOpenFiles) {
this.captureOpenFiles = captureOpenFiles;
}
/**
* @return skipCaptureAccessTimeOnlyChange
*/

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@ -843,6 +843,123 @@ public class TestOpenFilesWithSnapshot {
hbaseFileCksumBeforeTruncate, hbaseFileCksumS3);
}
private Path createSnapshot(Path snapRootDir, String snapName,
String fileName) throws Exception {
final Path snap1Dir = SnapshotTestHelper.createSnapshot(
fs, snapRootDir, snapName);
return new Path(snap1Dir, fileName);
}
private void verifyFileSize(long fileSize, Path... filePaths) throws
IOException {
for (Path filePath : filePaths) {
Assert.assertEquals(fileSize, fs.getFileStatus(filePath).getLen());
}
}
/**
* Verify open files captured in the snapshots across config disable
* and enable.
*/
@Test
public void testOpenFilesWithMixedConfig() throws Exception {
final Path snapRootDir = new Path("/level_0_A");
final String flumeFileName = "flume.log";
final String snap1Name = "s1";
final String snap2Name = "s2";
final String snap3Name = "s3";
final String snap4Name = "s4";
final String snap5Name = "s5";
// Create files and open streams
final Path flumeFile = new Path(snapRootDir, flumeFileName);
createFile(flumeFile);
FSDataOutputStream flumeOutputStream = fs.append(flumeFile);
// 1. Disable capture open files
cluster.getNameNode().getNamesystem()
.getSnapshotManager().setCaptureOpenFiles(false);
// Create Snapshot S1
final Path flumeS1Path = createSnapshot(snapRootDir,
snap1Name, flumeFileName);
// Verify if Snap S1 file length is same as the the current versions
verifyFileSize(FILELEN, flumeS1Path);
// Write more data to files
long flumeFileWrittenDataLength = FILELEN;
int newWriteLength = (int) (BLOCKSIZE * 1.5);
byte[] buf = new byte[newWriteLength];
Random random = new Random();
random.nextBytes(buf);
flumeFileWrittenDataLength += writeToStream(flumeOutputStream, buf);
// Create Snapshot S2
final Path flumeS2Path = createSnapshot(snapRootDir,
snap2Name, flumeFileName);
// Since capture open files was disabled, all snapshots paths
// and the current version should have same file lengths.
verifyFileSize(flumeFileWrittenDataLength,
flumeFile, flumeS2Path, flumeS1Path);
// 2. Enable capture open files
cluster.getNameNode().getNamesystem()
.getSnapshotManager() .setCaptureOpenFiles(true);
// Write more data to files
flumeFileWrittenDataLength += writeToStream(flumeOutputStream, buf);
long flumeFileLengthAfterS3 = flumeFileWrittenDataLength;
// Create Snapshot S3
final Path flumeS3Path = createSnapshot(snapRootDir,
snap3Name, flumeFileName);
// Since open files captured in the previous snapshots were with config
// disabled, their file lengths are now same as the current version.
// With the config turned on, any new data written to the open files
// will no more reflect in the current version or old snapshot paths.
verifyFileSize(flumeFileWrittenDataLength, flumeFile, flumeS3Path,
flumeS2Path, flumeS1Path);
// Write more data to files
flumeFileWrittenDataLength += writeToStream(flumeOutputStream, buf);
// Create Snapshot S4
final Path flumeS4Path = createSnapshot(snapRootDir,
snap4Name, flumeFileName);
// Verify S4 has the latest data
verifyFileSize(flumeFileWrittenDataLength, flumeFile, flumeS4Path);
// But, open files captured as of Snapshot S3 and before should
// have their old file lengths intact.
verifyFileSize(flumeFileLengthAfterS3, flumeS3Path,
flumeS2Path, flumeS1Path);
long flumeFileLengthAfterS4 = flumeFileWrittenDataLength;
// 3. Disable capture open files
cluster.getNameNode().getNamesystem()
.getSnapshotManager() .setCaptureOpenFiles(false);
// Create Snapshot S5
final Path flumeS5Path = createSnapshot(snapRootDir,
snap5Name, flumeFileName);
flumeFileWrittenDataLength += writeToStream(flumeOutputStream, buf);
// Since capture open files was disabled, any snapshots taken after the
// config change and the current version should have same file lengths
// for the open files.
verifyFileSize(flumeFileWrittenDataLength, flumeFile, flumeS5Path);
// But, the old snapshots taken before the config disable should
// continue to be consistent.
verifyFileSize(flumeFileLengthAfterS4, flumeS4Path);
}
private void restartNameNode() throws Exception {
cluster.triggerBlockReports();
NameNode nameNode = cluster.getNameNode();