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HDFS-2772. On transition to active, standby should not swallow ELIE. Contributed by Aaron T. Myers

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-1623@1232197 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Aaron Myers 2012-01-16 22:16:15 +00:00
parent 940eeb866c
commit d880c7cc78
3 changed files with 60 additions and 7 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-1623.txt
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@ -107,3 +107,5 @@ HDFS-2738. FSEditLog.selectinputStreams is reading through in-progress streams e
HDFS-2789. TestHAAdmin.testFailover is failing (eli)
HDFS-2747. Entering safe mode after starting SBN can NPE. (Uma Maheswara Rao G via todd)
HDFS-2772. On transition to active, standby should not swallow ELIE. (atm)

16
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/EditLogTailer.java
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@ -144,11 +144,13 @@ private void doTailEdits() throws IOException, InterruptedException {
try {
editsLoaded = image.loadEdits(streams, namesystem);
} catch (EditLogInputException elie) {
LOG.warn("Error while reading edits from disk. Will try again.", elie);
editsLoaded = elie.getNumEditsLoaded();
}
if (LOG.isDebugEnabled()) {
LOG.debug("editsLoaded: " + editsLoaded);
throw elie;
} finally {
if (editsLoaded > 0) {
LOG.info(String.format("Loaded %d edits starting from txid %d ",
editsLoaded, lastTxnId));
}
}
} finally {
namesystem.writeUnlock();
@ -180,12 +182,14 @@ public void run() {
while (shouldRun) {
try {
doTailEdits();
} catch (EditLogInputException elie) {
LOG.warn("Error while reading edits from disk. Will try again.", elie);
} catch (InterruptedException ie) {
// interrupter should have already set shouldRun to false
continue;
} catch (Throwable t) {
LOG.error("Error encountered while tailing edits. Shutting down " +
"standby NN.", t);
LOG.error("Unknown error encountered while tailing edits. " +
"Shutting down standby NN.", t);
runtime.exit(1);
}

49
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestFailureToReadEdits.java
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@ -30,17 +30,20 @@
import static org.mockito.Mockito.verify;
import java.io.IOException;
import java.net.URI;
import java.util.Collection;
import java.util.LinkedList;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.ha.ServiceFailedException;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.HAUtil;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.MiniDFSNNTopology;
import org.apache.hadoop.hdfs.server.namenode.EditLogInputException;
import org.apache.hadoop.hdfs.server.namenode.EditLogInputStream;
import org.apache.hadoop.hdfs.server.namenode.FSEditLog;
import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp;
@ -55,6 +58,9 @@
import com.google.common.collect.ImmutableList;
public class TestFailureToReadEdits {
private static final Log LOG = LogFactory.getLog(TestFailureToReadEdits.class);
private static final String TEST_DIR1 = "/test1";
private static final String TEST_DIR2 = "/test2";
private static final String TEST_DIR3 = "/test3";
@ -222,6 +228,47 @@ public void testCheckpointStartingMidEditsFile() throws Exception {
}
}
/**
* Ensure that the standby fails to become active if it cannot read all
* available edits in the shared edits dir when it is transitioning to active
* state.
*/
@Test
public void testFailureToReadEditsOnTransitionToActive() throws Exception {
assertTrue(fs.mkdirs(new Path(TEST_DIR1)));
HATestUtil.waitForStandbyToCatchUp(nn0, nn1);
// It should also upload it back to the active.
HATestUtil.waitForCheckpoint(cluster, 0, ImmutableList.of(0, 3));
causeFailureOnEditLogRead();
assertTrue(fs.mkdirs(new Path(TEST_DIR2)));
assertTrue(fs.mkdirs(new Path(TEST_DIR3)));
try {
HATestUtil.waitForStandbyToCatchUp(nn0, nn1);
fail("Standby fully caught up, but should not have been able to");
} catch (HATestUtil.CouldNotCatchUpException e) {
verify(mockRuntime, times(0)).exit(anyInt());
}
// Shutdown the active NN.
cluster.shutdownNameNode(0);
try {
// Transition the standby to active.
cluster.transitionToActive(1);
fail("Standby transitioned to active, but should not have been able to");
} catch (ServiceFailedException sfe) {
LOG.info("got expected exception: " + sfe.toString(), sfe);
assertTrue("Standby failed to catch up for some reason other than "
+ "failure to read logs", sfe.toString().contains(
EditLogInputException.class.getName()));
}
}
private LimitedEditLogAnswer causeFailureOnEditLogRead() throws IOException {
FSEditLog spyEditLog = spy(nn1.getNamesystem().getEditLogTailer()
.getEditLog());