HBASE-1022 Add storefile index size to hbase metrics

git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@720294 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -137,6 +137,7 @@ Release 0.19.0 - Unreleased
    HBASE-927   We don't recover if HRS hosting -ROOT-/.META. goes down
    HBASE-1013  Add debugging around commit log cleanup
    HBASE-972   Update hbase trunk to use released hadoop 0.19.0
+   HBASE-1022  Add storefile index size to hbase metrics
  
   NEW FEATURES
    HBASE-875   Use MurmurHash instead of JenkinsHash [in bloomfilters]

src/java/org/apache/hadoop/hbase/regionserver/HStore.java

@@ -2138,6 +2138,18 @@ public class HStore implements HConstants {
     return this.storefiles.size();
   }
 
+  /**
+   * @return The size of the store file indexes, in bytes.
+   * @throws IOException if there was a problem getting file sizes from the
+   * filesystem
+   */
+  long getStorefilesIndexSize() throws IOException {
+    long size = 0;
+    for (HStoreFile s: storefiles.values())
+      size += s.indexLength();
+    return size;
+  }
+
   /*
    * Datastructure that holds size and key.
    */

src/java/org/apache/hadoop/hbase/regionserver/HStoreFile.java

@@ -52,7 +52,7 @@ import org.apache.hadoop.io.SequenceFile;
  * <p>An HStoreFile usually tracks 4 things: its parent dir, the region
  * identifier, the column family, and the file identifier.  If you know those
  * four things, you know how to obtain the right HStoreFile.  HStoreFiles may
- * also refernce store files in another region serving either from
+ * also reference store files in another region serving either from
  * the top-half of the remote file or from the bottom-half.  Such references
  * are made fast splitting regions.
  * 
@@ -101,6 +101,7 @@ public class HStoreFile implements HConstants {
   /* If true, this file was product of a major compaction.
    */
   private boolean majorCompaction = false;
+  private long indexLength;
 
   /**
    * Constructor that fully initializes the object
@@ -477,6 +478,18 @@ public class HStoreFile implements HConstants {
     return (isReference())? l / 2: l;
   }
 
+  /**
+   * @return Length of the store map file index.
+   * @throws IOException
+   */
+  public synchronized long indexLength() throws IOException {
+    if (indexLength == 0) {
+      Path p = new Path(getMapFilePath(reference), MapFile.INDEX_FILE_NAME);
+      indexLength = p.getFileSystem(conf).getFileStatus(p).getLen();
+    }
+    return indexLength;
+  }
+
   @Override
   public String toString() {
     return encodedRegionName + "/" + Bytes.toString(colFamily) + "/" + fileId +

src/java/org/apache/hadoop/hbase/regionserver/metrics/RegionServerMetrics.java

@@ -54,6 +54,12 @@ public class RegionServerMetrics implements Updater {
    */
   public final MetricsIntValue storefiles = new MetricsIntValue("storefiles");
 
+  /**
+   * Sum of all the storefile index sizes in this regionserver in MB
+   */
+  public final MetricsIntValue storefileIndexSizeMB =
+    new MetricsIntValue("storefileIndexSizeMB");
+
   /**
    * Sum of all the memcache sizes in this regionserver in MB
    */
@@ -81,6 +87,7 @@ public class RegionServerMetrics implements Updater {
   public void doUpdates(@SuppressWarnings("unused") MetricsContext unused) {
     synchronized (this) {
       this.storefiles.pushMetric(this.metricsRecord);
+      this.storefileIndexSizeMB.pushMetric(this.metricsRecord);
       this.memcacheSizeMB.pushMetric(this.metricsRecord);
       this.regions.pushMetric(this.metricsRecord);
       synchronized(this.requests) {
@@ -126,6 +133,9 @@ public class RegionServerMetrics implements Updater {
     sb.append(this.regions.get());
     sb.append(", storefiles=");
     sb.append(this.storefiles.get());
+    sb.append(", storefileIndexSize=");
+    sb.append(this.storefileIndexSizeMB.get());
+    sb.append("MB");
     sb.append(", memcacheSize=");
     sb.append(this.memcacheSizeMB.get());
     sb.append("MB");