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HDFS-6041. Downgrade/Finalize should rename the rollback image instead of purging it. Contributed by Jing Zhao. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-5535@1573851 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jing Zhao 2014-03-04 04:42:58 +00:00
parent 9ad8dd1e8a
commit 5d29338017
5 changed files with 48 additions and 20 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES_HDFS-5535.txt
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@ -137,3 +137,5 @@ HDFS-5535 subtasks:
HDFS-6042. Fix rolling upgrade documentation and error messages. (szetszwo
via Arpit Agarwal)
HDFS-6041. Downgrade/Finalize should rename the rollback image instead of
purging it. (jing9)

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogLoader.java
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@ -736,7 +736,8 @@ private long applyEditLogOp(FSEditLogOp op, FSDirectory fsDir,
case OP_ROLLING_UPGRADE_FINALIZE: {
final long finalizeTime = ((RollingUpgradeOp) op).getTime();
fsNamesys.finalizeRollingUpgradeInternal(finalizeTime);
fsNamesys.getFSImage().purgeCheckpoints(NameNodeFile.IMAGE_ROLLBACK);
fsNamesys.getFSImage().renameCheckpoint(NameNodeFile.IMAGE_ROLLBACK,
NameNodeFile.IMAGE);
break;
}
case OP_ADD_CACHE_DIRECTIVE: {

46
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java
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@ -659,8 +659,8 @@ LayoutVersion.Feature.TXID_BASED_LAYOUT, getLayoutVersion())) {
needToSave |= needsResaveBasedOnStaleCheckpoint(imageFile.getFile(),
txnsAdvanced);
if (RollingUpgradeStartupOption.DOWNGRADE.matches(startOpt)) {
// purge rollback image if it is downgrade
archivalManager.purgeCheckpoints(NameNodeFile.IMAGE_ROLLBACK);
// rename rollback image if it is downgrade
renameCheckpoint(NameNodeFile.IMAGE_ROLLBACK, NameNodeFile.IMAGE);
}
} else {
// Trigger the rollback for rolling upgrade. Here lastAppliedTxId equals
@ -1097,18 +1097,7 @@ void purgeOldStorage(NameNodeFile nnf) {
}
/**
* Purge all the checkpoints with the name style.
*/
void purgeCheckpoints(NameNodeFile nnf) {
try {
archivalManager.purgeCheckpoints(nnf);
} catch (Exception e) {
LOG.warn("Unable to purge checkpoints with name " + nnf.getName(), e);
}
}
/**
* Rename FSImage
* Rename FSImage with the specific txid
*/
private void renameCheckpoint(long txid, NameNodeFile fromNnf,
NameNodeFile toNnf, boolean renameMD5) throws IOException {
@ -1128,6 +1117,32 @@ private void renameCheckpoint(long txid, NameNodeFile fromNnf,
if(al != null) storage.reportErrorsOnDirectories(al);
}
/**
* Rename all the fsimage files with the specific NameNodeFile type. The
* associated checksum files will also be renamed.
*/
void renameCheckpoint(NameNodeFile fromNnf, NameNodeFile toNnf)
throws IOException {
ArrayList<StorageDirectory> al = null;
FSImageTransactionalStorageInspector inspector =
new FSImageTransactionalStorageInspector(EnumSet.of(fromNnf));
storage.inspectStorageDirs(inspector);
for (FSImageFile image : inspector.getFoundImages()) {
try {
renameImageFileInDir(image.sd, fromNnf, toNnf, image.txId, true);
} catch (IOException ioe) {
LOG.warn("Unable to rename checkpoint in " + image.sd, ioe);
if (al == null) {
al = Lists.newArrayList();
}
al.add(image.sd);
}
}
if(al != null) {
storage.reportErrorsOnDirectories(al);
}
}
/**
* Deletes the checkpoint file in every storage directory,
* since the checkpoint was cancelled.
@ -1149,8 +1164,7 @@ private void renameImageFileInDir(StorageDirectory sd, NameNodeFile fromNnf,
NameNodeFile toNnf, long txid, boolean renameMD5) throws IOException {
final File fromFile = NNStorage.getStorageFile(sd, fromNnf, txid);
final File toFile = NNStorage.getStorageFile(sd, toNnf, txid);
// renameTo fails on Windows if the destination file
// already exists.
// renameTo fails on Windows if the destination file already exists.
if(LOG.isDebugEnabled()) {
LOG.debug("renaming " + fromFile.getAbsolutePath()
+ " to " + toFile.getAbsolutePath());

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -7287,7 +7287,8 @@ RollingUpgradeInfo finalizeRollingUpgrade() throws IOException {
returnInfo = finalizeRollingUpgradeInternal(now());
getEditLog().logFinalizeRollingUpgrade(returnInfo.getFinalizeTime());
getFSImage().saveNamespace(this);
getFSImage().purgeCheckpoints(NameNodeFile.IMAGE_ROLLBACK);
getFSImage().renameCheckpoint(NameNodeFile.IMAGE_ROLLBACK,
NameNodeFile.IMAGE);
} finally {
writeUnlock();
}

12
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestRollingUpgradeDowngrade.java
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@ -37,7 +37,7 @@
public class TestRollingUpgradeDowngrade {
@Test(timeout = 300000)
public void testDowngrade() throws IOException {
public void testDowngrade() throws Exception {
final Configuration conf = new HdfsConfiguration();
MiniQJMHACluster cluster = null;
final Path foo = new Path("/foo");
@ -48,6 +48,11 @@ public void testDowngrade() throws IOException {
MiniDFSCluster dfsCluster = cluster.getDfsCluster();
dfsCluster.waitActive();
// let NN1 tail editlog every 1s
dfsCluster.getConfiguration(1).setInt(
DFSConfigKeys.DFS_HA_TAILEDITS_PERIOD_KEY, 1);
dfsCluster.restartNameNode(1);
dfsCluster.transitionToActive(0);
DistributedFileSystem dfs = dfsCluster.getFileSystem(0);
dfs.mkdirs(foo);
@ -57,9 +62,14 @@ public void testDowngrade() throws IOException {
.rollingUpgrade(RollingUpgradeAction.PREPARE);
Assert.assertTrue(info.isStarted());
dfs.mkdirs(bar);
TestRollingUpgrade.queryForPreparation(dfs);
dfs.close();
dfsCluster.restartNameNode(0, true, "-rollingUpgrade", "downgrade");
// Once downgraded, there should be no more fsimage for rollbacks.
Assert.assertFalse(dfsCluster.getNamesystem(0).getFSImage()
.hasRollbackFSImage());
// shutdown NN1
dfsCluster.shutdownNameNode(1);
dfsCluster.transitionToActive(0);