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Subject [1/3] cassandra git commit: Add logback metrics
Date Tue, 16 Jun 2015 22:45:51 GMT
Repository: cassandra
Updated Branches:
  refs/heads/cassandra-2.2 6c4c146ea -> 514dcd944
  refs/heads/trunk 74cef19fd -> 7a8be7850

Add logback metrics

patch by yukim; reviewed by Jeremiah Jordan for CASSANDRA-9378


Branch: refs/heads/cassandra-2.2
Commit: 514dcd944c400a8a540962f54e16561d56496425
Parents: 6c4c146
Author: Yuki Morishita <>
Authored: Thu Jun 4 10:39:15 2015 -0500
Committer: Yuki Morishita <>
Committed: Tue Jun 16 17:39:00 2015 -0500

 CHANGES.txt                                     |   1 +
 conf/logback.xml                                |   9 +-
 lib/licenses/metrics-logback-3.1.0.txt          | 202 +++++++++++++++++++
 lib/metrics-logback-3.1.0.jar                   | Bin 0 -> 4130 bytes
 .../metrics/       |  23 +--
 .../cassandra/service/      |  25 ++-
 6 files changed, 240 insertions(+), 20 deletions(-)
diff --git a/CHANGES.txt b/CHANGES.txt
index 1138fc2..9dccd84 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -7,6 +7,7 @@
 Merged from 2.0:
  * Periodically submit background compaction tasks (CASSANDRA-9592)
  * Set HAS_MORE_PAGES flag to false when PagingState is null (CASSANDRA-9571)
+ * Add logback metrics (CASSANDRA-9378)
diff --git a/conf/logback.xml b/conf/logback.xml
index e170d41..eb2dcd1 100644
--- a/conf/logback.xml
+++ b/conf/logback.xml
@@ -43,10 +43,17 @@
       <pattern>%-5level %date{HH:mm:ss,SSS} %msg%n</pattern>
+  <!-- Uncomment bellow and corresponding appender-ref to activate logback metrics
+  <appender name="LogbackMetrics" class="com.codahale.metrics.logback.InstrumentedAppender"
+   -->
   <root level="INFO">
     <appender-ref ref="FILE" />
     <appender-ref ref="STDOUT" />
+    <!--
+    <appender-ref ref="LogbackMetrics" />
+    -->
   <logger name="com.thinkaurelius.thrift" level="ERROR"/>
diff --git a/lib/licenses/metrics-logback-3.1.0.txt b/lib/licenses/metrics-logback-3.1.0.txt
new file mode 100644
index 0000000..e4ba404
--- /dev/null
+++ b/lib/licenses/metrics-logback-3.1.0.txt
@@ -0,0 +1,202 @@
+                                 Apache License
+                           Version 2.0, January 2004
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diff --git a/lib/metrics-logback-3.1.0.jar b/lib/metrics-logback-3.1.0.jar
new file mode 100644
index 0000000..ce0bfbe
Binary files /dev/null and b/lib/metrics-logback-3.1.0.jar differ
diff --git a/src/java/org/apache/cassandra/metrics/ b/src/java/org/apache/cassandra/metrics/
index 7038e99..26b9c07 100644
--- a/src/java/org/apache/cassandra/metrics/
+++ b/src/java/org/apache/cassandra/metrics/
@@ -22,9 +22,6 @@ import java.lang.reflect.Method;
 import java.util.Locale;
 import java.util.concurrent.TimeUnit;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import com.codahale.metrics.*;
@@ -36,10 +33,9 @@ import*;
 public class CassandraMetricsRegistry extends MetricRegistry
-    protected static final Logger logger = LoggerFactory.getLogger(CassandraMetricsRegistry.class);
     public static final CassandraMetricsRegistry Metrics = new CassandraMetricsRegistry();
-    private MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
+    private final MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
     private CassandraMetricsRegistry()
@@ -100,15 +96,12 @@ public class CassandraMetricsRegistry extends MetricRegistry
-        } catch (InstanceNotFoundException | MBeanRegistrationException e)
-        {
-            logger.debug("Unable to remove mbean");
-        }
+        } catch (Exception ignore) {}
         return removed;
-    private void registerMBean(Metric metric, ObjectName name)
+    public void registerMBean(Metric metric, ObjectName name)
         AbstractBean mbean;
@@ -135,13 +128,7 @@ public class CassandraMetricsRegistry extends MetricRegistry
             mBeanServer.registerMBean(mbean, name);
-        } catch (InstanceAlreadyExistsException e)
-        {
-            logger.debug("Metric bean already exists", e);
-        } catch (MBeanRegistrationException | NotCompliantMBeanException e)
-        {
-            logger.debug("Unable to register metric bean", e);
-        }
+        } catch (Exception ignored) {}
     public interface MetricMBean
diff --git a/src/java/org/apache/cassandra/service/ b/src/java/org/apache/cassandra/service/
index 70420a9..59ecca7 100644
--- a/src/java/org/apache/cassandra/service/
+++ b/src/java/org/apache/cassandra/service/
@@ -30,13 +30,18 @@ import java.util.Map;
 import java.util.UUID;
 import java.util.concurrent.TimeUnit;
+import com.codahale.metrics.Meter;
+import com.codahale.metrics.MetricRegistryListener;
+import com.codahale.metrics.SharedMetricRegistries;
+import org.apache.cassandra.metrics.DefaultNameFactory;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -70,7 +75,25 @@ public class CassandraDaemon
     public static final String MBEAN_NAME = "org.apache.cassandra.db:type=NativeAccess";
     private static JMXConnectorServer jmxServer = null;
-    private static final Logger logger = LoggerFactory.getLogger(CassandraDaemon.class);
+    private static final Logger logger;
+    static {
+        // Need to register metrics before instrumented appender is created(first access
to LoggerFactory).
+        SharedMetricRegistries.getOrCreate("logback-metrics").addListener(new MetricRegistryListener.Base()
+        {
+            @Override
+            public void onMeterAdded(String metricName, Meter meter)
+            {
+                // Given metricName consists of appender name in logback.xml + "." + metric
+                // We first separate appender name
+                int separator = metricName.lastIndexOf('.');
+                String appenderName = metricName.substring(0, separator);
+                String metric = metricName.substring(separator + 1); // remove "."
+                ObjectName name = DefaultNameFactory.createMetricName(appenderName, metric,
+                CassandraMetricsRegistry.Metrics.registerMBean(meter, name);
+            }
+        });
+        logger = LoggerFactory.getLogger(CassandraDaemon.class);
+    }
     private static void maybeInitJmx()

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