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HDFS-7501. TransactionsSinceLastCheckpoint can be negative on SBNs. Contributed by Gautam Gopalakrishnan.

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This commit is contained in:
Harsh J 2015-03-29 00:45:01 +05:30
parent e0ccea33c9
commit 3d9132d434
3 changed files with 88 additions and 1 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -351,6 +351,9 @@ Release 2.8.0 - UNRELEASED
BUG FIXES
HDFS-7501. TransactionsSinceLastCheckpoint can be negative on SBNs.
(Gautam Gopalakrishnan via harsh)
HDFS-5356. MiniDFSCluster should close all open FileSystems when shutdown()
(Rakesh R via vinayakumarb)

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -4784,7 +4784,7 @@ public int getExpiredHeartbeats() {
@Metric({"TransactionsSinceLastCheckpoint",
"Number of transactions since last checkpoint"})
public long getTransactionsSinceLastCheckpoint() {
return getEditLog().getLastWrittenTxId() -
return getFSImage().getLastAppliedOrWrittenTxId() -
getFSImage().getStorage().getMostRecentCheckpointTxId();
}

84
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/metrics/TestNameNodeMetrics.java
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@ -22,12 +22,16 @@
import static org.apache.hadoop.test.MetricsAsserts.assertGauge;
import static org.apache.hadoop.test.MetricsAsserts.assertQuantileGauges;
import static org.apache.hadoop.test.MetricsAsserts.getMetrics;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.Random;
import com.google.common.collect.ImmutableList;
import com.google.common.io.Files;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.impl.Log4JLogger;
import org.apache.hadoop.conf.Configuration;
@ -39,6 +43,7 @@
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.MiniDFSNNTopology;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
@ -47,7 +52,9 @@
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
import org.apache.hadoop.hdfs.server.namenode.ha.HATestUtil;
import org.apache.hadoop.hdfs.server.namenode.top.TopAuditLogger;
import org.apache.hadoop.metrics2.MetricsRecordBuilder;
import org.apache.hadoop.metrics2.MetricsSource;
@ -69,6 +76,7 @@ public class TestNameNodeMetrics {
new Path("/testNameNodeMetrics");
private static final String NN_METRICS = "NameNodeActivity";
private static final String NS_METRICS = "FSNamesystem";
public static final Log LOG = LogFactory.getLog(TestNameNodeMetrics.class);
// Number of datanodes in the cluster
private static final int DATANODE_COUNT = 3;
@ -399,6 +407,82 @@ public void testGetBlockLocationMetric() throws Exception {
assertCounter("GetBlockLocations", 3L, getMetrics(NN_METRICS));
}
/**
* Testing TransactionsSinceLastCheckpoint. Need a new cluster as
* the other tests in here don't use HA. See HDFS-7501.
*/
@Test(timeout = 300000)
public void testTransactionSinceLastCheckpointMetrics() throws Exception {
Random random = new Random();
int retryCount = 0;
while (retryCount < 5) {
try {
int basePort = 10060 + random.nextInt(100) * 2;
MiniDFSNNTopology topology = new MiniDFSNNTopology()
.addNameservice(new MiniDFSNNTopology.NSConf("ns1")
.addNN(new MiniDFSNNTopology.NNConf("nn1").setHttpPort(basePort))
.addNN(new MiniDFSNNTopology.NNConf("nn2").setHttpPort(basePort + 1)));
HdfsConfiguration conf2 = new HdfsConfiguration();
// Lower the checkpoint condition for purpose of testing.
conf2.setInt(
DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_TXNS_KEY,
100);
// Check for checkpoint condition very often, for purpose of testing.
conf2.setInt(
DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_CHECK_PERIOD_KEY,
1);
// Poll and follow ANN txns very often, for purpose of testing.
conf2.setInt(DFSConfigKeys.DFS_HA_TAILEDITS_PERIOD_KEY, 1);
MiniDFSCluster cluster2 = new MiniDFSCluster.Builder(conf2)
.nnTopology(topology).numDataNodes(1).build();
cluster2.waitActive();
DistributedFileSystem fs2 = cluster2.getFileSystem(0);
NameNode nn0 = cluster2.getNameNode(0);
NameNode nn1 = cluster2.getNameNode(1);
cluster2.transitionToActive(0);
fs2.mkdirs(new Path("/tmp-t1"));
fs2.mkdirs(new Path("/tmp-t2"));
HATestUtil.waitForStandbyToCatchUp(nn0, nn1);
// Test to ensure tracking works before the first-ever
// checkpoint.
assertEquals("SBN failed to track 2 transactions pre-checkpoint.",
4L, // 2 txns added further when catch-up is called.
cluster2.getNameNode(1).getNamesystem()
.getTransactionsSinceLastCheckpoint());
// Complete up to the boundary required for
// an auto-checkpoint. Using 94 to expect fsimage
// rounded at 100, as 4 + 94 + 2 (catch-up call) = 100.
for (int i = 1; i <= 94; i++) {
fs2.mkdirs(new Path("/tmp-" + i));
}
HATestUtil.waitForStandbyToCatchUp(nn0, nn1);
// Assert 100 transactions in checkpoint.
HATestUtil.waitForCheckpoint(cluster2, 1, ImmutableList.of(100));
// Test to ensure number tracks the right state of
// uncheckpointed edits, and does not go negative
// (as fixed in HDFS-7501).
assertEquals("Should be zero right after the checkpoint.",
0L,
cluster2.getNameNode(1).getNamesystem()
.getTransactionsSinceLastCheckpoint());
fs2.mkdirs(new Path("/tmp-t3"));
fs2.mkdirs(new Path("/tmp-t4"));
HATestUtil.waitForStandbyToCatchUp(nn0, nn1);
// Test to ensure we track the right numbers after
// the checkpoint resets it to zero again.
assertEquals("SBN failed to track 2 added txns after the ckpt.",
4L,
cluster2.getNameNode(1).getNamesystem()
.getTransactionsSinceLastCheckpoint());
cluster2.shutdown();
break;
} catch (Exception e) {
LOG.warn("Unable to set up HA cluster, exception thrown: " + e);
retryCount++;
}
}
}
/**
* Test NN checkpoint and transaction-related metrics.
*/