klsince commented on code in PR #13632:
URL: https://github.com/apache/pinot/pull/13632#discussion_r1680227655
##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/utils/SegmentLocks.java:
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@@ -18,30 +18,25 @@
*/
package org.apache.pinot.segment.local.utils;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
+import org.apache.commons.lang3.tuple.Pair;
public class SegmentLocks {
- private static final int DEFAULT_NUM_LOCKS = 10000;
-
- private final Lock[] _locks;
- private final int _numLocks;
-
- public SegmentLocks(int numLocks) {
- _numLocks = numLocks;
- _locks = new Lock[numLocks];
- for (int i = 0; i < numLocks; i++) {
- _locks[i] = new ReentrantLock();
- }
- }
-
- public SegmentLocks() {
- this(DEFAULT_NUM_LOCKS);
- }
+ private final LoadingCache<Pair<String, String>, Lock> _locks =
+ CacheBuilder.newBuilder().weakValues().build(new CacheLoader<>() {
+ @Override
+ public Lock load(Pair<String, String> key) {
+ return new ReentrantLock();
+ }
+ });
public Lock getLock(String tableNameWithType, String segmentName) {
- return _locks[Math.abs((31 * tableNameWithType.hashCode() +
segmentName.hashCode()) % _numLocks)];
+ return _locks.getUnchecked(Pair.of(tableNameWithType, segmentName));
Review Comment:
What’s special about getUnchecked?
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