HDFS-8911. NameNode Metric : Add Editlog counters as a JMX metric. (Contributed by Anu Engineer)
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@ -237,6 +237,8 @@ Each metrics record contains tags such as HAState and Hostname as additional inf
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| `HAState` | (HA-only) Current state of the NameNode: initializing or active or standby or stopping state |
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| `FSState` | Current state of the file system: Safemode or Operational |
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| `LockQueueLength` | Number of threads waiting to acquire FSNameSystem lock |
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| `TotalSyncCount` | Total number of sync operations performed by edit log |
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| `TotalSyncTimes` | Total number of milliseconds spent by various edit logs in sync operation|
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JournalNode
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-----------
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@ -811,6 +811,9 @@ Release 2.8.0 - UNRELEASED
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HDFS-8826. In Balancer, add an option to specify the source node list
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so that balancer only selects blocks to move from those nodes. (szetszwo)
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HDFS-8911. NameNode Metric : Add Editlog counters as a JMX metric.
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(Anu Engineer via Arpit Agarwal)
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OPTIMIZATIONS
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HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than
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@ -1691,4 +1691,11 @@ public class FSEditLog implements LogsPurgeable {
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}
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}
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/**
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+ * Return total number of syncs happened on this edit log.
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+ * @return long - count
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+ */
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public long getTotalSyncCount() {
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return editLogStream.getNumSync();
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}
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}
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@ -7277,5 +7277,24 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
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}
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}
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/**
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* Return total number of Sync Operations on FSEditLog.
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*/
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@Override
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@Metric({"TotalSyncCount",
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"Total number of sync operations performed on edit logs"})
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public long getTotalSyncCount() {
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return fsImage.editLog.getTotalSyncCount();
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}
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/**
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* Return total time spent doing sync operations on FSEditLog.
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*/
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@Override
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@Metric({"TotalSyncTimes",
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"Total time spend in sync operation on various edit logs"})
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public String getTotalSyncTimes() {
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return fsImage.editLog.getJournalSet().getSyncTimes();
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}
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}
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@ -198,4 +198,14 @@ public interface FSNamesystemMBean {
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* @return int - Number of Threads waiting to acquire FSNameSystemLock
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*/
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int getFsLockQueueLength();
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/**
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* Return total number of Sync Operations on FSEditLog.
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*/
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long getTotalSyncCount();
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/**
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* Return total time spent doing sync operations on FSEditLog.
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*/
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String getTotalSyncTimes();
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}
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@ -30,6 +30,8 @@ import javax.management.MBeanInfo;
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import javax.management.MBeanServer;
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import javax.management.ObjectName;
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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.hdfs.MiniDFSCluster;
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import org.junit.Test;
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@ -159,4 +161,34 @@ public class TestFSNamesystemMBean {
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}
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}
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}
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}
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@Test(timeout = 120000)
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public void testFsEditLogMetrics() throws Exception {
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final Configuration conf = new Configuration();
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MiniDFSCluster cluster = null;
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try {
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cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
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cluster.waitActive();
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MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
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ObjectName mxbeanNameFs =
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new ObjectName("Hadoop:service=NameNode,name=FSNamesystemState");
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FileSystem fs = cluster.getFileSystem();
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final int NUM_OPS = 10;
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for (int i = 0; i < NUM_OPS; i++) {
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final Path path = new Path(String.format("/user%d", i));
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fs.mkdirs(path);
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}
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long syncCount = (long) mbs.getAttribute(mxbeanNameFs, "TotalSyncCount");
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String syncTimes =
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(String) mbs.getAttribute(mxbeanNameFs, "TotalSyncTimes");
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assertTrue(syncCount > 0);
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assertNotNull(syncTimes);
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} finally {
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if (cluster != null) {
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cluster.shutdown();
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}
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}
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}
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}
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