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LUCENE-1899: fix slow realloc performance if you set bits in order in a new OpenBitSet 

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@812904 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael McCandless 2009-09-09 11:51:41 +00:00
parent 0f5a2d1239
commit c5c363e540
2 changed files with 5 additions and 4 deletions
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4
CHANGES.txt
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@ -549,6 +549,10 @@ Bug fixes
Because of this IndexReader.isLocked() and IndexWriter.isLocked() did
not work correctly. (Uwe Schindler)
* LUCENE-1899: Fix O(N^2) CPU cost when setting docIDs in order in an
OpenBitSet, due to an inefficiency in how the underlying storage is
reallocated. (Nadav Har'El via Mike McCandless)
New features
* LUCENE-1411: Added expert API to open an IndexWriter on a prior

5
src/java/org/apache/lucene/util/OpenBitSet.java
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@ -483,7 +483,6 @@ public class OpenBitSet extends DocIdSet implements Cloneable, Serializable {
*/
public void flip(long startIndex, long endIndex) {
if (endIndex <= startIndex) return;
int oldlen = wlen;
int startWord = (int)(startIndex>>6);
// since endIndex is one past the end, this is index of the last
@ -742,9 +741,7 @@ public class OpenBitSet extends DocIdSet implements Cloneable, Serializable {
*/
public void ensureCapacityWords(int numWords) {
if (bits.length < numWords) {
long[] newBits = new long[numWords];
System.arraycopy(bits,0,newBits,0,wlen);
bits = newBits;
bits = ArrayUtil.grow(bits, numWords);
}
}