HADOOP-2619 Compaction errors after a region splits

git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk/src/contrib/hbase@612995 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -137,6 +137,7 @@ Trunk (unreleased changes)
    HADOOP-2493 hbase will split on row when the start and end row is the
                same cause data loss (Bryan Duxbury via Stack)
    HADOOP-2629 Shell digests garbage without complaint
+   HADOOP-2619 Compaction errors after a region splits
    
   IMPROVEMENTS
    HADOOP-2401 Add convenience put method that takes writable

src/java/org/apache/hadoop/hbase/HRegion.java

@@ -204,6 +204,7 @@ public class HRegion implements HConstants {
   final HBaseConfiguration conf;
   final HRegionInfo regionInfo;
   final Path regiondir;
+  private final Path regionCompactionDir;
 
   static class WriteState {
     // Set while a memcache flush is happening.
@@ -267,6 +268,9 @@ public class HRegion implements HConstants {
     this.regiondir = new Path(basedir, this.regionInfo.getEncodedName());
     Path oldLogFile = new Path(regiondir, HREGION_OLDLOGFILE_NAME);
 
+    this.regionCompactionDir =
+      new Path(getCompactionDir(basedir), this.regionInfo.getEncodedName());
+
     // Move prefab HStore files into place (if any).  This picks up split files
     // and any merges from splits and merges dirs.
     if(initialFiles != null && fs.exists(initialFiles)) {
@@ -706,6 +710,33 @@ public class HRegion implements HConstants {
     return compactStores();
   }
   
+  /*
+   * @param dir
+   * @return compaction directory for the passed in <code>dir</code>
+   */
+  static Path getCompactionDir(final Path dir) {
+   return new Path(dir, "compaction.dir");
+  }
+
+  /*
+   * Do preparation for pending compaction.
+   * Clean out any vestiges of previous failed compactions.
+   * @throws IOException
+   */
+  private void doRegionCompactionPrep() throws IOException {
+    doRegionCompactionCleanup();
+  }
+  
+  /*
+   * Removes the compaction directory for this Store.
+   * @throws IOException
+   */
+  private void doRegionCompactionCleanup() throws IOException {
+    if (this.fs.exists(this.regionCompactionDir)) {
+      this.fs.delete(this.regionCompactionDir);
+    }
+  }
+  
   /**
    * Compact all the stores.  This should be called periodically to make sure 
    * the stores are kept manageable.  
@@ -743,11 +774,13 @@ public class HRegion implements HConstants {
       LOG.info("starting compaction on region " +
         this.regionInfo.getRegionName().toString());
       boolean status = true;
+      doRegionCompactionPrep();
       for (HStore store : stores.values()) {
         if(!store.compact()) {
           status = false;
         }
       }
+      doRegionCompactionCleanup();
       LOG.info("compaction completed on region " +
         this.regionInfo.getRegionName().toString() + ". Took " +
         StringUtils.formatTimeDiff(System.currentTimeMillis(), startTime));

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

@@ -657,7 +657,7 @@ public class HStore implements HConstants {
     this.fs = fs;
     this.conf = conf;
     
-    this.compactionDir = new Path(basedir, "compaction.dir");
+    this.compactionDir = HRegion.getCompactionDir(basedir);
     this.storeName =
       this.info.getEncodedName() + "/" + this.family.getFamilyName();
     
@@ -1192,15 +1192,7 @@ public class HStore implements HConstants {
           " files using " + compactionDir.toString() + " for " +
           this.storeName);
       }
-      if (this.fs.exists(compactionDir)) {
-        // Clean out its content in prep. for this new compaction.  Has either
-        // aborted previous compaction or it has content of a previous
-        // compaction.
-        Path [] toRemove = this.fs.listPaths(new Path [] {compactionDir});
-        for (int i = 0; i < toRemove.length; i++) {
-          this.fs.delete(toRemove[i]);
-        }
-      }
+
       // Storefiles are keyed by sequence id. The oldest file comes first.
       // We need to return out of here a List that has the newest file first.
       List<HStoreFile> filesToCompact =
@@ -1215,15 +1207,14 @@ public class HStore implements HConstants {
       }
 
       if (!fs.exists(compactionDir) && !fs.mkdirs(compactionDir)) {
-        LOG.warn("Mkdir on " + compactionDir.toString() + " for " +
-            this.storeName + " failed");
+        LOG.warn("Mkdir on " + compactionDir.toString() + " failed");
         return false;
       }
 
       // Step through them, writing to the brand-new MapFile
       HStoreFile compactedOutputFile = new HStoreFile(conf, fs, 
-          this.compactionDir, info.getEncodedName(), family.getFamilyName(),
-          -1L, null);
+        this.compactionDir, info.getEncodedName(), family.getFamilyName(),
+        -1L, null);
       MapFile.Writer compactedOut = compactedOutputFile.getWriter(this.fs,
         this.compression, this.bloomFilter);
       try {