DivyanshIITB commented on code in PR #14335:
URL: https://github.com/apache/lucene/pull/14335#discussion_r1998646386
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lucene/core/src/java/org/apache/lucene/index/MultiTenantMergeScheduler.java:
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@@ -0,0 +1,44 @@
+package org.apache.lucene.index;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.io.IOException;
+
+/**
+ * A multi-tenant merge scheduler that shares a global thread pool across
multiple IndexWriters.
+ */
+public class MultiTenantMergeScheduler extends MergeScheduler {
+
+ // Shared global thread pool
+ private static final ExecutorService MERGE_THREAD_POOL =
Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors() / 2);
+
+ @Override
+ public void merge(MergeScheduler.MergeSource mergeSource, MergeTrigger
trigger) throws IOException {
+ while (true) {
+ MergePolicy.OneMerge merge = mergeSource.getNextMerge();
+ if (merge == null) {
+ break;
+ }
+ // Submit merge task to the shared thread pool
+ Future<?> future = MERGE_THREAD_POOL.submit(() -> {
+ try {
+ mergeSource.merge(merge);
+ } catch (IOException e) {
+ throw new RuntimeException(e);
+ }
+ });
+
+ try {
+ future.get(); // Ensure the task completes
+ } catch (Exception e) {
+ throw new IOException("Merge operation failed", e);
+ }
Review Comment:
Thanks for the feedback! You're absolutely right—blocking on future.get();
was making the merges sequential. I've removed it so that merges can now
proceed asynchronously in the background. Let me know if this aligns with the
intended behavior!
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