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From mikemcc...@apache.org
Subject svn commit: r581353 - in /lucene/java/trunk: ./ src/java/org/apache/lucene/index/ src/test/org/apache/lucene/index/
Date Tue, 02 Oct 2007 19:15:44 GMT
Author: mikemccand
Date: Tue Oct  2 12:15:43 2007
New Revision: 581353

URL: http://svn.apache.org/viewvc?rev=581353&view=rev
Log:
LUCENE-1007: allow flushing by ram, doc count, or both (whichever comes first) in IndexWriter

Modified:
    lucene/java/trunk/CHANGES.txt
    lucene/java/trunk/src/java/org/apache/lucene/index/ConcurrentMergeScheduler.java
    lucene/java/trunk/src/java/org/apache/lucene/index/DocumentsWriter.java
    lucene/java/trunk/src/java/org/apache/lucene/index/IndexModifier.java
    lucene/java/trunk/src/java/org/apache/lucene/index/IndexWriter.java
    lucene/java/trunk/src/java/org/apache/lucene/index/LogMergePolicy.java
    lucene/java/trunk/src/java/org/apache/lucene/index/SerialMergeScheduler.java
    lucene/java/trunk/src/java/org/apache/lucene/index/TermVectorsWriter.java
    lucene/java/trunk/src/test/org/apache/lucene/index/TestIndexModifier.java
    lucene/java/trunk/src/test/org/apache/lucene/index/TestIndexWriter.java

Modified: lucene/java/trunk/CHANGES.txt
URL: http://svn.apache.org/viewvc/lucene/java/trunk/CHANGES.txt?rev=581353&r1=581352&r2=581353&view=diff
==============================================================================
--- lucene/java/trunk/CHANGES.txt (original)
+++ lucene/java/trunk/CHANGES.txt Tue Oct  2 12:15:43 2007
@@ -179,6 +179,11 @@
     implementations that use SegmentInfos to access an index and 
     acquire a write lock for index modifications. (Michael Busch)
 
+11. LUCENE-1007: Allow flushing in IndexWriter to be triggered by
+    either RAM usage or document count or both (whichever comes
+    first), by adding symbolic constant DISABLE_AUTO_FLUSH to disable
+    one of the flush triggers.  (Ning Li via Mike McCandless)
+
 Documentation
 
 Build

Modified: lucene/java/trunk/src/java/org/apache/lucene/index/ConcurrentMergeScheduler.java
URL: http://svn.apache.org/viewvc/lucene/java/trunk/src/java/org/apache/lucene/index/ConcurrentMergeScheduler.java?rev=581353&r1=581352&r2=581353&view=diff
==============================================================================
--- lucene/java/trunk/src/java/org/apache/lucene/index/ConcurrentMergeScheduler.java (original)
+++ lucene/java/trunk/src/java/org/apache/lucene/index/ConcurrentMergeScheduler.java Tue Oct
 2 12:15:43 2007
@@ -21,7 +21,6 @@
 
 import java.io.IOException;
 import java.util.List;
-import java.util.LinkedList;
 import java.util.ArrayList;
 
 /** A {@link MergeScheduler} that runs each merge using a

Modified: lucene/java/trunk/src/java/org/apache/lucene/index/DocumentsWriter.java
URL: http://svn.apache.org/viewvc/lucene/java/trunk/src/java/org/apache/lucene/index/DocumentsWriter.java?rev=581353&r1=581352&r2=581353&view=diff
==============================================================================
--- lucene/java/trunk/src/java/org/apache/lucene/index/DocumentsWriter.java (original)
+++ lucene/java/trunk/src/java/org/apache/lucene/index/DocumentsWriter.java Tue Oct  2 12:15:43
2007
@@ -126,7 +126,7 @@
   private int pauseThreads;                       // Non-zero when we need all threads to
                                                   // pause (eg to flush)
   private boolean flushPending;                   // True when a thread has decided to flush
-  private boolean postingsIsFull;                 // True when it's time to write segment
+  private boolean bufferIsFull;                 // True when it's time to write segment
 
   private PrintStream infoStream;
 
@@ -148,6 +148,11 @@
   // non-zero we will flush by RAM usage instead.
   private int maxBufferedDocs = IndexWriter.DEFAULT_MAX_BUFFERED_DOCS;
 
+  // Coarse estimates used to measure RAM usage of buffered deletes
+  private static int OBJECT_HEADER_BYTES = 12;
+  private static int OBJECT_POINTER_BYTES = 4;    // TODO: should be 8 on 64-bit platform
+  private static int BYTES_PER_CHAR = 2;
+
   private BufferedNorms[] norms = new BufferedNorms[0];   // Holds norms until we flush
 
   DocumentsWriter(Directory directory, IndexWriter writer) throws IOException {
@@ -165,18 +170,25 @@
 
   /** Set how much RAM we can use before flushing. */
   void setRAMBufferSizeMB(double mb) {
-    ramBufferSize = (long) (mb*1024*1024);
+    if (mb == IndexWriter.DISABLE_AUTO_FLUSH) {
+      ramBufferSize = IndexWriter.DISABLE_AUTO_FLUSH;
+    } else {
+      ramBufferSize = (long) (mb*1024*1024);
+    }
   }
 
   double getRAMBufferSizeMB() {
-    return ramBufferSize/1024./1024.;
+    if (ramBufferSize == IndexWriter.DISABLE_AUTO_FLUSH) {
+      return ramBufferSize;
+    } else {
+      return ramBufferSize/1024./1024.;
+    }
   }
 
   /** Set max buffered docs, which means we will flush by
    *  doc count instead of by RAM usage. */
   void setMaxBufferedDocs(int count) {
     maxBufferedDocs = count;
-    ramBufferSize = 0;
   }
 
   int getMaxBufferedDocs() {
@@ -361,7 +373,7 @@
     threadBindings.clear();
     numBytesUsed = 0;
     balanceRAM();
-    postingsIsFull = false;
+    bufferIsFull = false;
     flushPending = false;
     segment = null;
     numDocsInRAM = 0;
@@ -582,7 +594,7 @@
         }
       }
 
-      if (postingsIsFull && !flushPending) {
+      if (bufferIsFull && !flushPending) {
         flushPending = true;
         doFlushAfter = true;
       }
@@ -961,7 +973,8 @@
       for(int i=0;i<numFields;i++)
         fieldDataArray[i].processField(analyzer);
 
-      if (numBytesUsed > 0.95 * ramBufferSize)
+      if (ramBufferSize != IndexWriter.DISABLE_AUTO_FLUSH
+          && numBytesUsed > 0.95 * ramBufferSize)
         balanceRAM();
     }
 
@@ -2137,10 +2150,8 @@
     // We must at this point commit to flushing to ensure we
     // always get N docs when we flush by doc count, even if
     // > 1 thread is adding documents:
-    /* new merge policy
-    if (!flushPending && maxBufferedDocs > 0 && numDocsInRAM >= maxBufferedDocs)
{
-    */
-    if (!flushPending && ramBufferSize == 0 && numDocsInRAM >= maxBufferedDocs)
{
+    if (!flushPending && maxBufferedDocs != IndexWriter.DISABLE_AUTO_FLUSH
+        && numDocsInRAM >= maxBufferedDocs) {
       flushPending = true;
       state.doFlushAfter = true;
     } else
@@ -2163,8 +2174,12 @@
       }
     }
 
-    if (delTerm != null)
+    if (delTerm != null) {
       addDeleteTerm(delTerm, state.docID);
+      if (!state.doFlushAfter) {
+        state.doFlushAfter = timeToFlushDeletes();
+      }
+    }
 
     return state;
   }
@@ -2211,9 +2226,11 @@
   }
 
   // Reset buffered deletes.
-  synchronized void clearBufferedDeleteTerms() {
+  synchronized void clearBufferedDeleteTerms() throws IOException {
     bufferedDeleteTerms.clear();
     numBufferedDeleteTerms = 0;
+    if (numBytesUsed > 0)
+      resetPostingsData();
   }
 
   synchronized boolean bufferDeleteTerms(Term[] terms) throws IOException {
@@ -2236,12 +2253,13 @@
   }
 
   synchronized private boolean timeToFlushDeletes() {
-    return numBufferedDeleteTerms >= maxBufferedDeleteTerms && setFlushPending();
+    return (bufferIsFull
+            || (maxBufferedDeleteTerms != IndexWriter.DISABLE_AUTO_FLUSH
+                && numBufferedDeleteTerms >= maxBufferedDeleteTerms))
+           && setFlushPending();
   }
 
   void setMaxBufferedDeleteTerms(int maxBufferedDeleteTerms) {
-    if (maxBufferedDeleteTerms < 1)
-      throw new IllegalArgumentException("maxBufferedDeleteTerms must at least be 1");
     this.maxBufferedDeleteTerms = maxBufferedDeleteTerms;
   }
 
@@ -2285,6 +2303,13 @@
     Num num = (Num) bufferedDeleteTerms.get(term);
     if (num == null) {
       bufferedDeleteTerms.put(term, new Num(docCount));
+      // This is coarse approximation of actual bytes used:
+      numBytesUsed += (term.field().length() + term.text().length()) * BYTES_PER_CHAR
+          + Integer.SIZE/8 + 5 * OBJECT_HEADER_BYTES + 5 * OBJECT_POINTER_BYTES;
+      if (ramBufferSize != IndexWriter.DISABLE_AUTO_FLUSH
+          && numBytesUsed > ramBufferSize) {
+        bufferIsFull = true;
+      }
     } else {
       num.setNum(docCount);
     }
@@ -2827,7 +2852,7 @@
    * pools to match the current docs. */
   private synchronized void balanceRAM() {
 
-    if (ramBufferSize == 0.0 || postingsIsFull)
+    if (ramBufferSize == IndexWriter.DISABLE_AUTO_FLUSH || bufferIsFull)
       return;
 
     // We free our allocations if we've allocated 5% over
@@ -2864,9 +2889,9 @@
       while(numBytesAlloc > freeLevel) {
         if (0 == freeByteBlocks.size() && 0 == freeCharBlocks.size() && 0
== postingsFreeCount) {
           // Nothing else to free -- must flush now.
-          postingsIsFull = true;
+          bufferIsFull = true;
           if (infoStream != null)
-            infoStream.println("    nothing to free; now set postingsIsFull");
+            infoStream.println("    nothing to free; now set bufferIsFull");
           break;
         }
 
@@ -2909,7 +2934,7 @@
                              " allocMB=" + nf.format(numBytesAlloc/1024./1024.) +
                              " triggerMB=" + nf.format(flushTrigger/1024./1024.));
 
-        postingsIsFull = true;
+        bufferIsFull = true;
       }
     }
   }

Modified: lucene/java/trunk/src/java/org/apache/lucene/index/IndexModifier.java
URL: http://svn.apache.org/viewvc/lucene/java/trunk/src/java/org/apache/lucene/index/IndexModifier.java?rev=581353&r1=581352&r2=581353&view=diff
==============================================================================
--- lucene/java/trunk/src/java/org/apache/lucene/index/IndexModifier.java (original)
+++ lucene/java/trunk/src/java/org/apache/lucene/index/IndexModifier.java Tue Oct  2 12:15:43
2007
@@ -208,7 +208,7 @@
       indexWriter.setMergeScheduler(new SerialMergeScheduler());
       indexWriter.setInfoStream(infoStream);
       indexWriter.setUseCompoundFile(useCompoundFile);
-      if (maxBufferedDocs != 0)
+      if (maxBufferedDocs != IndexWriter.DISABLE_AUTO_FLUSH)
         indexWriter.setMaxBufferedDocs(maxBufferedDocs);
       indexWriter.setMaxFieldLength(maxFieldLength);
       indexWriter.setMergeFactor(mergeFactor);

Modified: lucene/java/trunk/src/java/org/apache/lucene/index/IndexWriter.java
URL: http://svn.apache.org/viewvc/lucene/java/trunk/src/java/org/apache/lucene/index/IndexWriter.java?rev=581353&r1=581352&r2=581353&view=diff
==============================================================================
--- lucene/java/trunk/src/java/org/apache/lucene/index/IndexWriter.java (original)
+++ lucene/java/trunk/src/java/org/apache/lucene/index/IndexWriter.java Tue Oct  2 12:15:43
2007
@@ -37,7 +37,6 @@
 import java.util.HashSet;
 import java.util.LinkedList;
 import java.util.Iterator;
-import java.util.ListIterator;
 import java.util.Map.Entry;
 
 /**
@@ -205,10 +204,15 @@
   public final static int DEFAULT_MERGE_FACTOR = LogMergePolicy.DEFAULT_MERGE_FACTOR;
 
   /**
-   * Default value is 0 (because IndexWriter flushes by RAM
-   * usage by default). Change using {@link #setMaxBufferedDocs(int)}.
+   * Value to denote a flush trigger is disabled
    */
-  public final static int DEFAULT_MAX_BUFFERED_DOCS = 0;
+  public final static int DISABLE_AUTO_FLUSH = -1;
+
+  /**
+   * Disabled by default (because IndexWriter flushes by RAM usage
+   * by default). Change using {@link #setMaxBufferedDocs(int)}.
+   */
+  public final static int DEFAULT_MAX_BUFFERED_DOCS = DISABLE_AUTO_FLUSH;
 
   /**
    * Default value is 16 MB (which means flush when buffered
@@ -217,9 +221,10 @@
   public final static double DEFAULT_RAM_BUFFER_SIZE_MB = 16.0;
 
   /**
-   * Default value is 1000. Change using {@link #setMaxBufferedDeleteTerms(int)}.
+   * Disabled by default (because IndexWriter flushes by RAM usage
+   * by default). Change using {@link #setMaxBufferedDeleteTerms(int)}.
    */
-  public final static int DEFAULT_MAX_BUFFERED_DELETE_TERMS = 1000;
+  public final static int DEFAULT_MAX_BUFFERED_DELETE_TERMS = DISABLE_AUTO_FLUSH;
 
   /**
    * @deprecated
@@ -817,20 +822,28 @@
    * indexing.
    *
    * <p>When this is set, the writer will flush every
-   * maxBufferedDocs added documents and never flush by RAM
-   * usage.</p>
+   * maxBufferedDocs added documents.  Pass in {@link
+   * #DISABLE_AUTO_FLUSH} to prevent triggering a flush due
+   * to number of buffered documents.  Note that if flushing
+   * by RAM usage is also enabled, then the flush will be
+   * triggered by whichever comes first.</p>
    *
-   * <p> The default value is 0 (writer flushes by RAM
-   * usage).</p>
+   * <p>Disabled by default (writer flushes by RAM usage).</p>
    *
    * @throws IllegalArgumentException if maxBufferedDocs is
-   * smaller than 2
+   * enabled but smaller than 2, or it disables maxBufferedDocs
+   * when ramBufferSize is already disabled
    * @see #setRAMBufferSizeMB
    */
   public void setMaxBufferedDocs(int maxBufferedDocs) {
     ensureOpen();
-    if (maxBufferedDocs < 2)
-      throw new IllegalArgumentException("maxBufferedDocs must at least be 2");
+    if (maxBufferedDocs != DISABLE_AUTO_FLUSH && maxBufferedDocs < 2)
+      throw new IllegalArgumentException(
+          "maxBufferedDocs must at least be 2 when enabled");
+    if (maxBufferedDocs == DISABLE_AUTO_FLUSH
+        && getRAMBufferSizeMB() == DISABLE_AUTO_FLUSH)
+      throw new IllegalArgumentException(
+          "at least one of ramBufferSize and maxBufferedDocs must be enabled");
     docWriter.setMaxBufferedDocs(maxBufferedDocs);
     pushMaxBufferedDocs();
   }
@@ -841,7 +854,7 @@
    * as its minMergeDocs, to keep backwards compatibility.
    */
   private void pushMaxBufferedDocs() {
-    if (docWriter.getRAMBufferSizeMB() == 0.0) {
+    if (docWriter.getMaxBufferedDocs() != DISABLE_AUTO_FLUSH) {
       final MergePolicy mp = mergePolicy;
       if (mp instanceof LogDocMergePolicy) {
         LogDocMergePolicy lmp = (LogDocMergePolicy) mp;
@@ -856,9 +869,8 @@
   }
 
   /**
-   * Returns 0 if this writer is flushing by RAM usage, else
-   * returns the number of buffered added documents that will
-   * trigger a flush.
+   * Returns the number of buffered added documents that will
+   * trigger a flush if enabled.
    * @see #setMaxBufferedDocs
    */
   public int getMaxBufferedDocs() {
@@ -873,20 +885,30 @@
    * count and use as large a RAM buffer as you can.
    *
    * <p>When this is set, the writer will flush whenever
-   * buffered documents use this much RAM.</p>
+   * buffered documents use this much RAM.  Pass in {@link
+   * #DISABLE_AUTO_FLUSH} to prevent triggering a flush due
+   * to RAM usage.  Note that if flushing by document count
+   * is also enabled, then the flush will be triggered by
+   * whichever comes first.</p>
    *
    * <p> The default value is {@link #DEFAULT_RAM_BUFFER_SIZE_MB}.</p>
+   * 
+   * @throws IllegalArgumentException if ramBufferSize is
+   * enabled but non-positive, or it disables ramBufferSize
+   * when maxBufferedDocs is already disabled
    */
   public void setRAMBufferSizeMB(double mb) {
-    if (mb <= 0.0)
-      throw new IllegalArgumentException("ramBufferSize should be > 0.0 MB");
+    if (mb != DISABLE_AUTO_FLUSH && mb <= 0.0)
+      throw new IllegalArgumentException(
+          "ramBufferSize should be > 0.0 MB when enabled");
+    if (mb == DISABLE_AUTO_FLUSH && getMaxBufferedDocs() == DISABLE_AUTO_FLUSH)
+      throw new IllegalArgumentException(
+          "at least one of ramBufferSize and maxBufferedDocs must be enabled");
     docWriter.setRAMBufferSizeMB(mb);
   }
 
   /**
-   * Returns 0.0 if this writer is flushing by document
-   * count, else returns the value set by {@link
-   * #setRAMBufferSizeMB}.
+   * Returns the value set by {@link #setRAMBufferSizeMB} if enabled.
    */
   public double getRAMBufferSizeMB() {
     return docWriter.getRAMBufferSizeMB();
@@ -898,17 +920,24 @@
    * buffered in memory at the time, they are merged and a new segment is
    * created.</p>
 
-   * <p>The default value is {@link #DEFAULT_MAX_BUFFERED_DELETE_TERMS}.
-   * @throws IllegalArgumentException if maxBufferedDeleteTerms is smaller than 1</p>
+   * <p>Disabled by default (writer flushes by RAM usage).</p>
+   * 
+   * @throws IllegalArgumentException if maxBufferedDeleteTerms
+   * is enabled but smaller than 1
+   * @see #setRAMBufferSizeMB
    */
   public void setMaxBufferedDeleteTerms(int maxBufferedDeleteTerms) {
     ensureOpen();
+    if (maxBufferedDeleteTerms != DISABLE_AUTO_FLUSH
+        && maxBufferedDeleteTerms < 1)
+      throw new IllegalArgumentException(
+          "maxBufferedDeleteTerms must at least be 1 when enabled");
     docWriter.setMaxBufferedDeleteTerms(maxBufferedDeleteTerms);
   }
 
   /**
    * Returns the number of buffered deleted terms that will
-   * trigger a flush.
+   * trigger a flush if enabled.
    * @see #setMaxBufferedDeleteTerms
    */
   public int getMaxBufferedDeleteTerms() {
@@ -1479,13 +1508,7 @@
     }
   }
 
-  /** Determines amount of RAM usage by the buffered docs at
-   * which point we trigger a flush to the index.
-   */
-  private double ramBufferSize = DEFAULT_RAM_BUFFER_SIZE_MB*1024F*1024F;
-
   /** If non-null, information about merges will be printed to this.
-
    */
   private PrintStream infoStream = null;
   private static PrintStream defaultInfoStream = null;

Modified: lucene/java/trunk/src/java/org/apache/lucene/index/LogMergePolicy.java
URL: http://svn.apache.org/viewvc/lucene/java/trunk/src/java/org/apache/lucene/index/LogMergePolicy.java?rev=581353&r1=581352&r2=581353&view=diff
==============================================================================
--- lucene/java/trunk/src/java/org/apache/lucene/index/LogMergePolicy.java (original)
+++ lucene/java/trunk/src/java/org/apache/lucene/index/LogMergePolicy.java Tue Oct  2 12:15:43
2007
@@ -18,8 +18,6 @@
  */
 
 import java.io.IOException;
-import java.util.List;
-import java.util.ArrayList;
 import java.util.Set;
 
 import org.apache.lucene.store.Directory;

Modified: lucene/java/trunk/src/java/org/apache/lucene/index/SerialMergeScheduler.java
URL: http://svn.apache.org/viewvc/lucene/java/trunk/src/java/org/apache/lucene/index/SerialMergeScheduler.java?rev=581353&r1=581352&r2=581353&view=diff
==============================================================================
--- lucene/java/trunk/src/java/org/apache/lucene/index/SerialMergeScheduler.java (original)
+++ lucene/java/trunk/src/java/org/apache/lucene/index/SerialMergeScheduler.java Tue Oct 
2 12:15:43 2007
@@ -18,7 +18,6 @@
  */
 
 import java.io.IOException;
-import java.util.LinkedList;
 
 /** A {@link MergeScheduler} that simply does each merge
  *  sequentially, using the current thread. */

Modified: lucene/java/trunk/src/java/org/apache/lucene/index/TermVectorsWriter.java
URL: http://svn.apache.org/viewvc/lucene/java/trunk/src/java/org/apache/lucene/index/TermVectorsWriter.java?rev=581353&r1=581352&r2=581353&view=diff
==============================================================================
--- lucene/java/trunk/src/java/org/apache/lucene/index/TermVectorsWriter.java (original)
+++ lucene/java/trunk/src/java/org/apache/lucene/index/TermVectorsWriter.java Tue Oct  2 12:15:43
2007
@@ -22,7 +22,6 @@
 import org.apache.lucene.util.StringHelper;
 
 import java.io.IOException;
-import java.util.Vector;
 
 final class TermVectorsWriter {
   

Modified: lucene/java/trunk/src/test/org/apache/lucene/index/TestIndexModifier.java
URL: http://svn.apache.org/viewvc/lucene/java/trunk/src/test/org/apache/lucene/index/TestIndexModifier.java?rev=581353&r1=581352&r2=581353&view=diff
==============================================================================
--- lucene/java/trunk/src/test/org/apache/lucene/index/TestIndexModifier.java (original)
+++ lucene/java/trunk/src/test/org/apache/lucene/index/TestIndexModifier.java Tue Oct  2 12:15:43
2007
@@ -75,7 +75,7 @@
     //  Lucene defaults:
     assertNull(i.getInfoStream());
     assertTrue(i.getUseCompoundFile());
-    assertEquals(0, i.getMaxBufferedDocs());
+    assertEquals(IndexWriter.DISABLE_AUTO_FLUSH, i.getMaxBufferedDocs());
     assertEquals(10000, i.getMaxFieldLength());
     assertEquals(10, i.getMergeFactor());
     // test setting properties:

Modified: lucene/java/trunk/src/test/org/apache/lucene/index/TestIndexWriter.java
URL: http://svn.apache.org/viewvc/lucene/java/trunk/src/test/org/apache/lucene/index/TestIndexWriter.java?rev=581353&r1=581352&r2=581353&view=diff
==============================================================================
--- lucene/java/trunk/src/test/org/apache/lucene/index/TestIndexWriter.java (original)
+++ lucene/java/trunk/src/test/org/apache/lucene/index/TestIndexWriter.java Tue Oct  2 12:15:43
2007
@@ -1151,8 +1151,8 @@
       RAMDirectory dir = new RAMDirectory();      
       IndexWriter writer  = new IndexWriter(dir, new WhitespaceAnalyzer(), true);
       writer.setMaxBufferedDocs(10);
+      writer.setRAMBufferSizeMB(IndexWriter.DISABLE_AUTO_FLUSH);
 
-      int lastNumFile = dir.list().length;
       long lastGen = -1;
       for(int j=1;j<52;j++) {
         Document doc = new Document();
@@ -1169,25 +1169,89 @@
           assertTrue(gen > lastGen);
           lastGen = gen;
           writer.setRAMBufferSizeMB(0.000001);
+          writer.setMaxBufferedDocs(IndexWriter.DISABLE_AUTO_FLUSH);
         } else if (j < 20) {
           assertTrue(gen > lastGen);
           lastGen = gen;
         } else if (20 == j) {
           writer.setRAMBufferSizeMB(16);
+          writer.setMaxBufferedDocs(IndexWriter.DISABLE_AUTO_FLUSH);
           lastGen = gen;
         } else if (j < 30) {
           assertEquals(gen, lastGen);
         } else if (30 == j) {
           writer.setRAMBufferSizeMB(0.000001);
+          writer.setMaxBufferedDocs(IndexWriter.DISABLE_AUTO_FLUSH);
         } else if (j < 40) {
           assertTrue(gen> lastGen);
           lastGen = gen;
         } else if (40 == j) {
           writer.setMaxBufferedDocs(10);
+          writer.setRAMBufferSizeMB(IndexWriter.DISABLE_AUTO_FLUSH);
           lastGen = gen;
         } else if (j < 50) {
           assertEquals(gen, lastGen);
           writer.setMaxBufferedDocs(10);
+          writer.setRAMBufferSizeMB(IndexWriter.DISABLE_AUTO_FLUSH);
+        } else if (50 == j) {
+          assertTrue(gen > lastGen);
+        }
+      }
+      writer.close();
+      dir.close();
+    }
+
+    public void testChangingRAMBuffer2() throws IOException {
+      RAMDirectory dir = new RAMDirectory();      
+      IndexWriter writer  = new IndexWriter(dir, new WhitespaceAnalyzer(), true);
+      writer.setMaxBufferedDocs(10);
+      writer.setMaxBufferedDeleteTerms(10);
+      writer.setRAMBufferSizeMB(IndexWriter.DISABLE_AUTO_FLUSH);
+
+      for(int j=1;j<52;j++) {
+        Document doc = new Document();
+        doc.add(new Field("field", "aaa" + j, Field.Store.YES, Field.Index.TOKENIZED));
+        writer.addDocument(doc);
+      }
+      
+      long lastGen = -1;
+      for(int j=1;j<52;j++) {
+        writer.deleteDocuments(new Term("field", "aaa" + j));
+        _TestUtil.syncConcurrentMerges(writer);
+        long gen = SegmentInfos.generationFromSegmentsFileName(SegmentInfos.getCurrentSegmentFileName(dir.list()));
+        if (j == 1)
+          lastGen = gen;
+        else if (j < 10) {
+          // No new files should be created
+          assertEquals(gen, lastGen);
+        } else if (10 == j) {
+          assertTrue(gen > lastGen);
+          lastGen = gen;
+          writer.setRAMBufferSizeMB(0.000001);
+          writer.setMaxBufferedDeleteTerms(IndexWriter.DISABLE_AUTO_FLUSH);
+        } else if (j < 20) {
+          assertTrue(gen > lastGen);
+          lastGen = gen;
+        } else if (20 == j) {
+          writer.setRAMBufferSizeMB(16);
+          writer.setMaxBufferedDeleteTerms(IndexWriter.DISABLE_AUTO_FLUSH);
+          lastGen = gen;
+        } else if (j < 30) {
+          assertEquals(gen, lastGen);
+        } else if (30 == j) {
+          writer.setRAMBufferSizeMB(0.000001);
+          writer.setMaxBufferedDeleteTerms(IndexWriter.DISABLE_AUTO_FLUSH);
+        } else if (j < 40) {
+          assertTrue(gen> lastGen);
+          lastGen = gen;
+        } else if (40 == j) {
+          writer.setMaxBufferedDeleteTerms(10);
+          writer.setRAMBufferSizeMB(IndexWriter.DISABLE_AUTO_FLUSH);
+          lastGen = gen;
+        } else if (j < 50) {
+          assertEquals(gen, lastGen);
+          writer.setMaxBufferedDeleteTerms(10);
+          writer.setRAMBufferSizeMB(IndexWriter.DISABLE_AUTO_FLUSH);
         } else if (50 == j) {
           assertTrue(gen > lastGen);
         }



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