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From st...@apache.org
Subject svn commit: r1340285 - in /hbase/branches/0.92: ./ src/main/java/org/apache/hadoop/hbase/regionserver/ src/main/java/org/apache/hadoop/hbase/regionserver/compactions/ src/test/java/org/apache/hadoop/hbase/regionserver/
Date Fri, 18 May 2012 22:20:34 GMT
Author: stack
Date: Fri May 18 22:20:33 2012
New Revision: 1340285

URL: http://svn.apache.org/viewvc?rev=1340285&view=rev
Log:
HBASE-5920 New Compactions Logic can silently prevent user-initiated compactions from occurring

Modified:
    hbase/branches/0.92/CHANGES.txt
    hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/CompactSplitThread.java
    hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
    hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
    hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/compactions/CompactionRequest.java
    hbase/branches/0.92/src/test/java/org/apache/hadoop/hbase/regionserver/TestCompaction.java

Modified: hbase/branches/0.92/CHANGES.txt
URL: http://svn.apache.org/viewvc/hbase/branches/0.92/CHANGES.txt?rev=1340285&r1=1340284&r2=1340285&view=diff
==============================================================================
--- hbase/branches/0.92/CHANGES.txt (original)
+++ hbase/branches/0.92/CHANGES.txt Fri May 18 22:20:33 2012
@@ -67,6 +67,8 @@ Release 0.92.2 - Unreleased
    HBASE-6021  NullPointerException when running LoadTestTool without specifying compression
type
    HBASE-5342  Grant/Revoke global permissions (Matteo)
    HBASE-6054  0.92 failing because of missing commons-io after upgrade to hadoop 1.0.3
+   HBASE-5920  New Compactions Logic can silently prevent user-initiated compactions from
occurring
+               (Derek Wollenstein)
 
   IMPROVEMENTS
    HBASE-5592  Make it easier to get a table from shell (Ben West)

Modified: hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/CompactSplitThread.java
URL: http://svn.apache.org/viewvc/hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/CompactSplitThread.java?rev=1340285&r1=1340284&r2=1340285&view=diff
==============================================================================
--- hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/CompactSplitThread.java
(original)
+++ hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/CompactSplitThread.java
Fri May 18 22:20:33 2012
@@ -49,12 +49,6 @@ public class CompactSplitThread implemen
   private final ThreadPoolExecutor splits;
   private final long throttleSize;
 
-  /* The default priority for user-specified compaction requests.
-   * The user gets top priority unless we have blocking compactions. (Pri <= 0)
-   */
-  public static final int PRIORITY_USER = 1;
-  public static final int NO_PRIORITY = Integer.MIN_VALUE;
-
   /**
    * Splitting should not take place if the total number of regions exceed this.
    * This is not a hard limit to the number of regions but it is a guideline to
@@ -145,7 +139,7 @@ public class CompactSplitThread implemen
 
   public synchronized boolean requestSplit(final HRegion r) {
     // don't split regions that are blocking
-    if (shouldSplitRegion() && r.getCompactPriority() >= PRIORITY_USER) {
+    if (shouldSplitRegion() && r.getCompactPriority() >= Store.PRIORITY_USER)
{
       byte[] midKey = r.checkSplit();
       if (midKey != null) {
         requestSplit(r, midKey);
@@ -174,13 +168,13 @@ public class CompactSplitThread implemen
   public synchronized void requestCompaction(final HRegion r,
       final String why) {
     for(Store s : r.getStores().values()) {
-      requestCompaction(r, s, why, NO_PRIORITY);
+      requestCompaction(r, s, why, Store.NO_PRIORITY);
     }
   }
 
   public synchronized void requestCompaction(final HRegion r, final Store s,
       final String why) {
-    requestCompaction(r, s, why, NO_PRIORITY);
+    requestCompaction(r, s, why, Store.NO_PRIORITY);
   }
 
   public synchronized void requestCompaction(final HRegion r, final String why,
@@ -201,10 +195,10 @@ public class CompactSplitThread implemen
     if (this.server.isStopped()) {
       return;
     }
-    CompactionRequest cr = s.requestCompaction();
+    CompactionRequest cr = s.requestCompaction(priority);
     if (cr != null) {
       cr.setServer(server);
-      if (priority != NO_PRIORITY) {
+      if (priority != Store.NO_PRIORITY) {
         cr.setPriority(priority);
       }
       ThreadPoolExecutor pool = largeCompactions;
@@ -222,6 +216,10 @@ public class CompactSplitThread implemen
             + (why != null && !why.isEmpty() ? "; Because: " + why : "")
             + "; " + this);
       }
+    } else {
+      if(LOG.isDebugEnabled()) {
+        LOG.debug("Not compacting " + r.getRegionNameAsString() + " because compaction request
was cancelled");
+      }
     }
   }
 

Modified: hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
URL: http://svn.apache.org/viewvc/hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java?rev=1340285&r1=1340284&r2=1340285&view=diff
==============================================================================
--- hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
(original)
+++ hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
Fri May 18 22:20:33 2012
@@ -38,7 +38,6 @@ import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-import java.util.Map.Entry;
 import java.util.Random;
 import java.util.Set;
 import java.util.SortedMap;
@@ -152,8 +151,6 @@ import org.apache.hadoop.net.DNS;
 import org.apache.hadoop.util.StringUtils;
 import org.apache.zookeeper.KeeperException;
 import org.codehaus.jackson.map.ObjectMapper;
-import org.apache.hadoop.hbase.regionserver.wal.FailedLogCloseException;
-import org.apache.hadoop.util.ReflectionUtils;
 
 import com.google.common.base.Function;
 import com.google.common.collect.Lists;
@@ -2672,9 +2669,10 @@ public class HRegionServer implements HR
     if (major) {
       region.triggerMajorCompaction();
     }
+    LOG.trace("User-triggered compaction requested for region " + region.getRegionNameAsString());
     compactSplitThread.requestCompaction(region, "User-triggered "
         + (major ? "major " : "") + "compaction",
-        CompactSplitThread.PRIORITY_USER);
+        Store.PRIORITY_USER);
   }
 
   /** @return the info server */

Modified: hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
URL: http://svn.apache.org/viewvc/hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java?rev=1340285&r1=1340284&r2=1340285&view=diff
==============================================================================
--- hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java (original)
+++ hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java Fri
May 18 22:20:33 2012
@@ -88,6 +88,13 @@ import com.google.common.collect.Lists;
  */
 public class Store implements HeapSize {
   static final Log LOG = LogFactory.getLog(Store.class);
+
+  /* The default priority for user-specified compaction requests.
+  * The user gets top priority unless we have blocking compactions. (Pri <= 0)
+  */
+  public static final int PRIORITY_USER = 1;
+  public static final int NO_PRIORITY = Integer.MIN_VALUE;
+
   protected final MemStore memstore;
   // This stores directory in the filesystem.
   private final Path homedir;
@@ -970,6 +977,11 @@ public class Store implements HeapSize {
   }
 
   public CompactionRequest requestCompaction() {
+    return requestCompaction(NO_PRIORITY);
+  }
+
+
+  public CompactionRequest requestCompaction(int priority) {
     // don't even select for compaction if writes are disabled
     if (!this.region.areWritesEnabled()) {
       return null;
@@ -1000,7 +1012,7 @@ public class Store implements HeapSize {
           // coprocessor is overriding normal file selection
           filesToCompact = candidates;
         } else {
-          filesToCompact = compactSelection(candidates);
+          filesToCompact = compactSelection(candidates, priority);
         }
 
         if (region.getCoprocessorHost() != null) {
@@ -1031,7 +1043,7 @@ public class Store implements HeapSize {
         }
 
         // everything went better than expected. create a compaction request
-        int pri = getCompactPriority();
+        int pri = getCompactPriority(priority);
         ret = new CompactionRequest(region, this, filesToCompact, isMajor, pri);
       }
     } catch (IOException ex) {
@@ -1049,6 +1061,18 @@ public class Store implements HeapSize {
     }
   }
 
+
+  /**
+   * Default priority version of {@link #compactSelection(java.util.List, int)}
+   * @param candidates
+   * @return
+   * @throws IOException
+   */
+  List<StoreFile> compactSelection(List<StoreFile> candidates) throws IOException
{
+    return compactSelection(candidates,NO_PRIORITY);
+  }
+
+
   /**
    * Algorithm to choose which files to compact
    *
@@ -1064,11 +1088,13 @@ public class Store implements HeapSize {
    *  "hbase.hstore.compaction.max"
    *    max files to compact at once (avoids OOM)
    *
+   *
    * @param candidates candidate files, ordered from oldest to newest
+   * @param priority
    * @return subset copy of candidate list that meets compaction criteria
    * @throws IOException
    */
-  List<StoreFile> compactSelection(List<StoreFile> candidates)
+  List<StoreFile> compactSelection(List<StoreFile> candidates, int priority)
       throws IOException {
     // ASSUMPTION!!! filesCompacting is locked when calling this function
 
@@ -1103,8 +1129,14 @@ public class Store implements HeapSize {
     }
 
     // major compact on user action or age (caveat: we have too many files)
-    boolean majorcompaction = filesToCompact.size() < this.maxFilesToCompact
-      && (forcemajor || isMajorCompaction(filesToCompact));
+    // Force a major compaction if this is a user-requested major compaction,
+    // or if we do not have too many files to compact and this was requested
+    // as a major compaction
+    boolean majorcompaction = (forcemajor && priority == PRIORITY_USER) ||
+        (filesToCompact.size() < this.maxFilesToCompact
+        && (forcemajor || isMajorCompaction(filesToCompact)));
+    LOG.debug(this.getHRegionInfo().getEncodedName() + " - " +
+            this.storeNameStr + ": Initiating " + (majorcompaction ? "major" : "minor") +
"compaction");
 
     if (!majorcompaction && !hasReferences(filesToCompact)) {
       // we're doing a minor compaction, let's see what files are applicable
@@ -1113,6 +1145,11 @@ public class Store implements HeapSize {
 
       // skip selection algorithm if we don't have enough files
       if (filesToCompact.size() < this.minFilesToCompact) {
+        if(LOG.isDebugEnabled()) {
+          LOG.debug("Not compacting files because we only have " + filesToCompact.size()
+
+              " files ready for compaction.  Need " + this.minFilesToCompact + " to initiate.");
+
+        }
         return Collections.emptyList();
       }
 
@@ -1169,10 +1206,17 @@ public class Store implements HeapSize {
         return Collections.emptyList();
       }
     } else {
-      // all files included in this compaction, up to max
-      if (filesToCompact.size() > this.maxFilesToCompact) {
-        int pastMax = filesToCompact.size() - this.maxFilesToCompact;
-        filesToCompact.subList(0, pastMax).clear();
+      if(!majorcompaction) {
+        // all files included in this compaction, up to max
+        if (filesToCompact.size() > this.maxFilesToCompact) {
+          int pastMax = filesToCompact.size() - this.maxFilesToCompact;
+          filesToCompact.subList(0, pastMax).clear();
+        }
+      } else if (filesToCompact.size() > this.maxFilesToCompact) {
+        LOG.debug("Warning, compacting more than " + this.maxFilesToCompact + " files, probably
because of a user-requested major compaction");
+        if(priority != PRIORITY_USER) {
+          LOG.error("Compacting more than max files on a non user-requested compaction");
+        }
       }
     }
     return filesToCompact;
@@ -1807,10 +1851,23 @@ public class Store implements HeapSize {
   }
 
   /**
-   * @return The priority that this store should have in the compaction queue
+   * Same as {@link #getCompactPriority(int)} with a default priority
    */
   public int getCompactPriority() {
-    return this.blockingStoreFileCount - this.storefiles.size();
+    return getCompactPriority(NO_PRIORITY);
+  }
+
+  /**
+   * @return The priority that this store should have in the compaction queue
+   * @param priority
+   */
+  public int getCompactPriority(int priority) {
+    // If this is a user-requested compaction, leave this at the highest priority
+    if(priority == PRIORITY_USER) {
+      return PRIORITY_USER;
+    } else {
+      return this.blockingStoreFileCount - this.storefiles.size();
+    }
   }
 
   HRegion getHRegion() {

Modified: hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/compactions/CompactionRequest.java
URL: http://svn.apache.org/viewvc/hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/compactions/CompactionRequest.java?rev=1340285&r1=1340284&r2=1340285&view=diff
==============================================================================
--- hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/compactions/CompactionRequest.java
(original)
+++ hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/regionserver/compactions/CompactionRequest.java
Fri May 18 22:20:33 2012
@@ -181,7 +181,7 @@ public class CompactionRequest implement
         if (completed) {
           server.getMetrics().addCompaction(now - start, this.totalSize);
           // degenerate case: blocked regions require recursive enqueues
-          if (s.getCompactPriority() <= 0) {
+          if (s.getCompactPriority(Store.NO_PRIORITY) <= 0) {
             server.compactSplitThread
               .requestCompaction(r, s, "Recursive enqueue");
           } else {

Modified: hbase/branches/0.92/src/test/java/org/apache/hadoop/hbase/regionserver/TestCompaction.java
URL: http://svn.apache.org/viewvc/hbase/branches/0.92/src/test/java/org/apache/hadoop/hbase/regionserver/TestCompaction.java?rev=1340285&r1=1340284&r2=1340285&view=diff
==============================================================================
--- hbase/branches/0.92/src/test/java/org/apache/hadoop/hbase/regionserver/TestCompaction.java
(original)
+++ hbase/branches/0.92/src/test/java/org/apache/hadoop/hbase/regionserver/TestCompaction.java
Fri May 18 22:20:33 2012
@@ -19,19 +19,6 @@
  */
 package org.apache.hadoop.hbase.regionserver;
 
-import static org.mockito.Mockito.doAnswer;
-import static org.mockito.Mockito.spy;
-
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-
-import static org.junit.Assert.fail;
-
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.fs.FSDataOutputStream;
@@ -39,22 +26,23 @@ import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hbase.*;
-import org.apache.hadoop.hbase.client.Delete;
-import org.apache.hadoop.hbase.client.Get;
-import org.apache.hadoop.hbase.client.Put;
-import org.apache.hadoop.hbase.client.Result;
-import org.apache.hadoop.hbase.client.Scan;
+import org.apache.hadoop.hbase.client.*;
 import org.apache.hadoop.hbase.io.hfile.HFileScanner;
 import org.apache.hadoop.hbase.regionserver.compactions.CompactionProgress;
-import org.apache.hadoop.hbase.regionserver.StoreFile;
+import org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest;
 import org.apache.hadoop.hbase.regionserver.wal.HLog;
 import org.apache.hadoop.hbase.util.Bytes;
-import org.apache.hadoop.hdfs.MiniDFSCluster;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
+
 import org.mockito.invocation.InvocationOnMock;
 import org.mockito.stubbing.Answer;
 
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.spy;
+
 
 /**
  * Test compactions
@@ -66,22 +54,26 @@ public class TestCompaction extends HBas
   private HRegion r = null;
   private Path compactionDir = null;
   private Path regionCompactionDir = null;
-  private static final byte [] COLUMN_FAMILY = fam1;
-  private final byte [] STARTROW = Bytes.toBytes(START_KEY);
-  private static final byte [] COLUMN_FAMILY_TEXT = COLUMN_FAMILY;
+  private static final byte[] COLUMN_FAMILY = fam1;
+  private final byte[] STARTROW = Bytes.toBytes(START_KEY);
+  private static final byte[] COLUMN_FAMILY_TEXT = COLUMN_FAMILY;
   private int compactionThreshold;
   private byte[] firstRowBytes, secondRowBytes, thirdRowBytes;
   final private byte[] col1, col2;
+  private static final long MAX_FILES_TO_COMPACT = 10;
 
 
-  /** constructor */
+  /**
+   * constructor
+   */
   public TestCompaction() throws Exception {
     super();
 
     // Set cache flush size to 1MB
-    conf.setInt("hbase.hregion.memstore.flush.size", 1024*1024);
+    conf.setInt("hbase.hregion.memstore.flush.size", 1024 * 1024);
     conf.setInt("hbase.hregion.memstore.block.multiplier", 100);
     compactionThreshold = conf.getInt("hbase.hstore.compactionThreshold", 3);
+    this.conf.setLong("hbase.hstore.compaction.max.size", MAX_FILES_TO_COMPACT);
 
     firstRowBytes = START_KEY.getBytes(HConstants.UTF8_ENCODING);
     secondRowBytes = START_KEY.getBytes(HConstants.UTF8_ENCODING);
@@ -110,9 +102,9 @@ public class TestCompaction extends HBas
   }
 
   /**
-   * Test that on a major compaction, if all cells are expired or deleted, then
-   * we'll end up with no product.  Make sure scanner over region returns
-   * right answer in this case - and that it just basically works.
+   * Test that on a major compaction, if all cells are expired or deleted, then we'll end
up with no product.  Make sure
+   * scanner over region returns right answer in this case - and that it just basically works.
+   *
    * @throws IOException
    */
   public void testMajorCompactingToNoOutput() throws IOException {
@@ -127,7 +119,7 @@ public class TestCompaction extends HBas
       boolean result = s.next(results);
       r.delete(new Delete(results.get(0).getRow()), null, false);
       if (!result) break;
-    } while(true);
+    } while (true);
     // Flush
     r.flushcache();
     // Major compact.
@@ -139,13 +131,13 @@ public class TestCompaction extends HBas
       boolean result = s.next(results);
       if (!result) break;
       counter++;
-    } while(true);
+    } while (true);
     assertEquals(0, counter);
   }
 
   /**
-   * Run compaction and flushing memstore
-   * Assert deletes get cleaned up.
+   * Run compaction and flushing memstore Assert deletes get cleaned up.
+   *
    * @throws Exception
    */
   public void testMajorCompaction() throws Exception {
@@ -164,7 +156,7 @@ public class TestCompaction extends HBas
     assertEquals(compactionThreshold, result.size());
 
     // see if CompactionProgress is in place but null
-    for (Store store: this.r.stores.values()) {
+    for (Store store : this.r.stores.values()) {
       assertNull(store.getCompactionProgress());
     }
 
@@ -173,19 +165,19 @@ public class TestCompaction extends HBas
 
     // see if CompactionProgress has done its thing on at least one store
     int storeCount = 0;
-    for (Store store: this.r.stores.values()) {
+    for (Store store : this.r.stores.values()) {
       CompactionProgress progress = store.getCompactionProgress();
-      if( progress != null ) {
+      if (progress != null) {
         ++storeCount;
-        assert(progress.currentCompactedKVs > 0);
-        assert(progress.totalCompactingKVs > 0);
+        assert (progress.currentCompactedKVs > 0);
+        assert (progress.totalCompactingKVs > 0);
       }
-      assert(storeCount > 0);
+      assert (storeCount > 0);
     }
 
     // look at the second row
     // Increment the least significant character so we get to next row.
-    byte [] secondRowBytes = START_KEY.getBytes(HConstants.UTF8_ENCODING);
+    byte[] secondRowBytes = START_KEY.getBytes(HConstants.UTF8_ENCODING);
     secondRowBytes[START_KEY_BYTES.length - 1]++;
 
     // Always 3 versions if that is what max versions is.
@@ -198,42 +190,42 @@ public class TestCompaction extends HBas
     // should result in a compacted store file that has no references to the
     // deleted row.
     Delete delete = new Delete(secondRowBytes, System.currentTimeMillis(), null);
-    byte [][] famAndQf = {COLUMN_FAMILY, null};
+    byte[][] famAndQf = {COLUMN_FAMILY, null};
     delete.deleteFamily(famAndQf[0]);
     r.delete(delete, null, true);
 
     // Assert deleted.
-    result = r.get(new Get(secondRowBytes).addFamily(COLUMN_FAMILY_TEXT).setMaxVersions(100),
null );
+    result = r.get(new Get(secondRowBytes).addFamily(COLUMN_FAMILY_TEXT).setMaxVersions(100),
null);
     assertTrue("Second row should have been deleted", result.isEmpty());
 
     r.flushcache();
 
-    result = r.get(new Get(secondRowBytes).addFamily(COLUMN_FAMILY_TEXT).setMaxVersions(100),
null );
+    result = r.get(new Get(secondRowBytes).addFamily(COLUMN_FAMILY_TEXT).setMaxVersions(100),
null);
     assertTrue("Second row should have been deleted", result.isEmpty());
 
     // Add a bit of data and flush.  Start adding at 'bbb'.
     createSmallerStoreFile(this.r);
     r.flushcache();
     // Assert that the second row is still deleted.
-    result = r.get(new Get(secondRowBytes).addFamily(COLUMN_FAMILY_TEXT).setMaxVersions(100),
null );
+    result = r.get(new Get(secondRowBytes).addFamily(COLUMN_FAMILY_TEXT).setMaxVersions(100),
null);
     assertTrue("Second row should still be deleted", result.isEmpty());
 
     // Force major compaction.
     r.compactStores(true);
     assertEquals(r.getStore(COLUMN_FAMILY_TEXT).getStorefiles().size(), 1);
 
-    result = r.get(new Get(secondRowBytes).addFamily(COLUMN_FAMILY_TEXT).setMaxVersions(100),
null );
+    result = r.get(new Get(secondRowBytes).addFamily(COLUMN_FAMILY_TEXT).setMaxVersions(100),
null);
     assertTrue("Second row should still be deleted", result.isEmpty());
 
     // Make sure the store files do have some 'aaa' keys in them -- exactly 3.
     // Also, that compacted store files do not have any secondRowBytes because
     // they were deleted.
-    verifyCounts(3,0);
+    verifyCounts(3, 0);
 
     // Multiple versions allowed for an entry, so the delete isn't enough
     // Lower TTL and expire to ensure that all our entries have been wiped
     final int ttlInSeconds = 1;
-    for (Store store: this.r.stores.values()) {
+    for (Store store : this.r.stores.values()) {
       store.ttl = ttlInSeconds * 1000;
     }
     Thread.sleep(ttlInSeconds * 1000);
@@ -247,12 +239,14 @@ public class TestCompaction extends HBas
     Delete deleteRow = new Delete(secondRowBytes);
     testMinorCompactionWithDelete(deleteRow);
   }
+
   public void testMinorCompactionWithDeleteColumn1() throws Exception {
     Delete dc = new Delete(secondRowBytes);
     /* delete all timestamps in the column */
     dc.deleteColumns(fam2, col2);
     testMinorCompactionWithDelete(dc);
   }
+
   public void testMinorCompactionWithDeleteColumn2() throws Exception {
     Delete dc = new Delete(secondRowBytes);
     dc.deleteColumn(fam2, col2);
@@ -265,11 +259,13 @@ public class TestCompaction extends HBas
     //testMinorCompactionWithDelete(dc, 2);
     testMinorCompactionWithDelete(dc, 3);
   }
+
   public void testMinorCompactionWithDeleteColumnFamily() throws Exception {
     Delete deleteCF = new Delete(secondRowBytes);
     deleteCF.deleteFamily(fam2);
     testMinorCompactionWithDelete(deleteCF);
   }
+
   public void testMinorCompactionWithDeleteVersion1() throws Exception {
     Delete deleteVersion = new Delete(secondRowBytes);
     deleteVersion.deleteColumns(fam2, col2, 2);
@@ -278,6 +274,7 @@ public class TestCompaction extends HBas
      */
     testMinorCompactionWithDelete(deleteVersion, 1);
   }
+
   public void testMinorCompactionWithDeleteVersion2() throws Exception {
     Delete deleteVersion = new Delete(secondRowBytes);
     deleteVersion.deleteColumn(fam2, col2, 1);
@@ -299,6 +296,7 @@ public class TestCompaction extends HBas
   private void testMinorCompactionWithDelete(Delete delete) throws Exception {
     testMinorCompactionWithDelete(delete, 0);
   }
+
   private void testMinorCompactionWithDelete(Delete delete, int expectedResultsAfterDelete)
throws Exception {
     HRegionIncommon loader = new HRegionIncommon(r);
     for (int i = 0; i < compactionThreshold + 1; i++) {
@@ -360,25 +358,25 @@ public class TestCompaction extends HBas
   private void verifyCounts(int countRow1, int countRow2) throws Exception {
     int count1 = 0;
     int count2 = 0;
-    for (StoreFile f: this.r.stores.get(COLUMN_FAMILY_TEXT).getStorefiles()) {
+    for (StoreFile f : this.r.stores.get(COLUMN_FAMILY_TEXT).getStorefiles()) {
       HFileScanner scanner = f.getReader().getScanner(false, false);
       scanner.seekTo();
       do {
-        byte [] row = scanner.getKeyValue().getRow();
+        byte[] row = scanner.getKeyValue().getRow();
         if (Bytes.equals(row, STARTROW)) {
           count1++;
-        } else if(Bytes.equals(row, secondRowBytes)) {
+        } else if (Bytes.equals(row, secondRowBytes)) {
           count2++;
         }
-      } while(scanner.next());
+      } while (scanner.next());
     }
-    assertEquals(countRow1,count1);
-    assertEquals(countRow2,count2);
+    assertEquals(countRow1, count1);
+    assertEquals(countRow2, count2);
   }
 
   /**
-   * Verify that you can stop a long-running compaction
-   * (used during RS shutdown)
+   * Verify that you can stop a long-running compaction (used during RS shutdown)
+   *
    * @throws Exception
    */
   public void testInterruptCompaction() throws Exception {
@@ -386,12 +384,12 @@ public class TestCompaction extends HBas
 
     // lower the polling interval for this test
     int origWI = Store.closeCheckInterval;
-    Store.closeCheckInterval = 10*1000; // 10 KB
+    Store.closeCheckInterval = 10 * 1000; // 10 KB
 
     try {
       // Create a couple store files w/ 15KB (over 10KB interval)
-      int jmax = (int) Math.ceil(15.0/compactionThreshold);
-      byte [] pad = new byte[1000]; // 1 KB chunk
+      int jmax = (int) Math.ceil(15.0 / compactionThreshold);
+      byte[] pad = new byte[1000]; // 1 KB chunk
       for (int i = 0; i < compactionThreshold; i++) {
         HRegionIncommon loader = new HRegionIncommon(r);
         Put p = new Put(Bytes.add(STARTROW, Bytes.toBytes(i)));
@@ -418,7 +416,7 @@ public class TestCompaction extends HBas
       // ensure that the compaction stopped, all old files are intact,
       Store s = r.stores.get(COLUMN_FAMILY);
       assertEquals(compactionThreshold, s.getStorefilesCount());
-      assertTrue(s.getStorefilesSize() > 15*1000);
+      assertTrue(s.getStorefilesSize() > 15 * 1000);
       // and no new store files persisted past compactStores()
       FileStatus[] ls = FileSystem.get(conf).listStatus(r.getTmpDir());
       assertEquals(0, ls.length);
@@ -431,7 +429,7 @@ public class TestCompaction extends HBas
       // Delete all Store information once done using
       for (int i = 0; i < compactionThreshold; i++) {
         Delete delete = new Delete(Bytes.add(STARTROW, Bytes.toBytes(i)));
-        byte [][] famAndQf = {COLUMN_FAMILY, null};
+        byte[][] famAndQf = {COLUMN_FAMILY, null};
         delete.deleteFamily(famAndQf[0]);
         r.delete(delete, null, true);
       }
@@ -440,7 +438,7 @@ public class TestCompaction extends HBas
       // Multiple versions allowed for an entry, so the delete isn't enough
       // Lower TTL and expire to ensure that all our entries have been wiped
       final int ttlInSeconds = 1;
-      for (Store store: this.r.stores.values()) {
+      for (Store store : this.r.stores.values()) {
         store.ttl = ttlInSeconds * 1000;
       }
       Thread.sleep(ttlInSeconds * 1000);
@@ -452,7 +450,7 @@ public class TestCompaction extends HBas
 
   private int count() throws IOException {
     int count = 0;
-    for (StoreFile f: this.r.stores.
+    for (StoreFile f : this.r.stores.
         get(COLUMN_FAMILY_TEXT).getStorefiles()) {
       HFileScanner scanner = f.getReader().getScanner(false, false);
       if (!scanner.seekTo()) {
@@ -460,7 +458,7 @@ public class TestCompaction extends HBas
       }
       do {
         count++;
-      } while(scanner.next());
+      } while (scanner.next());
     }
     return count;
   }
@@ -474,7 +472,7 @@ public class TestCompaction extends HBas
   private void createSmallerStoreFile(final HRegion region) throws IOException {
     HRegionIncommon loader = new HRegionIncommon(region);
     addContent(loader, Bytes.toString(COLUMN_FAMILY), ("" +
-    		"bbb").getBytes(), null);
+        "bbb").getBytes(), null);
     loader.flushcache();
   }
 
@@ -514,4 +512,41 @@ public class TestCompaction extends HBas
     fail("testCompactionWithCorruptResult failed since no exception was" +
         "thrown while completing a corrupt file");
   }
+
+  /**
+   * Test for HBASE-5920 - Test user requested major compactions always occurring
+   */
+  public void testNonUserMajorCompactionRequest() throws Exception {
+    Store store = r.getStore(COLUMN_FAMILY);
+    createStoreFile(r);
+    for (int i = 0; i < MAX_FILES_TO_COMPACT + 1; i++) {
+      createStoreFile(r);
+    }
+    store.triggerMajorCompaction();
+
+    CompactionRequest request = store.requestCompaction(Store.NO_PRIORITY);
+    assertNotNull("Expected to receive a compaction request", request);
+    assertEquals(
+      "System-requested major compaction should not occur if there are too many store files",
+      false,
+      request.isMajor());
+  }
+
+  /**
+   * Test for HBASE-5920
+   */
+  public void testUserMajorCompactionRequest() throws IOException{
+    Store store = r.getStore(COLUMN_FAMILY);
+    createStoreFile(r);
+    for (int i = 0; i < MAX_FILES_TO_COMPACT + 1; i++) {
+      createStoreFile(r);
+    }
+    store.triggerMajorCompaction();
+    CompactionRequest request = store.requestCompaction(Store.PRIORITY_USER);
+    assertNotNull("Expected to receive a compaction request", request);
+    assertEquals(
+      "User-requested major compaction should always occur, even if there are too many store
files",
+      true,
+      request.isMajor());
+  }
 }



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