rahulgoswami commented on code in PR #3883:
URL: https://github.com/apache/solr/pull/3883#discussion_r2563451574
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solr/core/src/java/org/apache/solr/index/LatestVersionFilterMergePolicy.java:
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@@ -0,0 +1,52 @@
+package org.apache.solr.index;
+
+import java.io.IOException;
+import java.util.Map;
+import org.apache.lucene.index.MergePolicy;
+import org.apache.lucene.index.MergeTrigger;
+import org.apache.lucene.index.SegmentCommitInfo;
+import org.apache.lucene.index.SegmentInfos;
+import org.apache.lucene.index.TieredMergePolicy;
+import org.apache.lucene.util.Version;
+
+/**
+ * Only allows latest version segments to be considered for merges. That way a
snapshot of older
+ * segments can remain consistent
+ */
+public class LatestVersionFilterMergePolicy extends MergePolicy {
+ MergePolicy delegatePolicy = new TieredMergePolicy();
+
+ @Override
+ public MergeSpecification findMerges(
+ MergeTrigger mergeTrigger, SegmentInfos infos, MergeContext
mergeContext) throws IOException {
+ /*we don't want to remove from the original SegmentInfos, else the
segments may not carry forward upon a commit.
Review Comment:
Rephrased to not sound alarming
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