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HDFS-14513. FSImage which is saving should be clean while NameNode shutdown. Contributed by He Xiaoqiao.

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This commit is contained in:
Inigo Goiri 2019-06-11 11:48:35 -07:00
parent e997f2a34a
commit 5740eea081
1 changed files with 25 additions and 0 deletions
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25
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java
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@ -37,6 +37,7 @@
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.hadoop.util.ShutdownHookManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.classification.InterfaceAudience;
@ -88,6 +89,11 @@ public class FSImage implements Closeable {
public static final Logger LOG =
LoggerFactory.getLogger(FSImage.class.getName());
/**
* Priority of the FSImageSaver shutdown hook: {@value}.
*/
public static final int SHUTDOWN_HOOK_PRIORITY = 10;
protected FSEditLog editLog = null;
private boolean isUpgradeFinalized = false;
@ -1037,6 +1043,18 @@ public FSImageSaver(SaveNamespaceContext context, StorageDirectory sd,
@Override
public void run() {
// Deletes checkpoint file in every storage directory when shutdown.
Runnable cancelCheckpointFinalizer = () -> {
try {
deleteCancelledCheckpoint(context.getTxId());
LOG.info("FSImageSaver clean checkpoint: txid={} when meet " +
"shutdown.", context.getTxId());
} catch (IOException e) {
LOG.error("FSImageSaver cancel checkpoint threw an exception:", e);
}
};
ShutdownHookManager.get().addShutdownHook(cancelCheckpointFinalizer,
SHUTDOWN_HOOK_PRIORITY);
try {
saveFSImage(context, sd, nnf);
} catch (SaveNamespaceCancelledException snce) {
@ -1046,6 +1064,13 @@ public void run() {
} catch (Throwable t) {
LOG.error("Unable to save image for " + sd.getRoot(), t);
context.reportErrorOnStorageDirectory(sd);
try {
deleteCancelledCheckpoint(context.getTxId());
LOG.info("FSImageSaver clean checkpoint: txid={} when meet " +
"Throwable.", context.getTxId());
} catch (IOException e) {
LOG.error("FSImageSaver cancel checkpoint threw an exception:", e);
}
}
}