From b7ac911eb0747e43e24c49c4540b5b43e568235e Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Sun, 18 Feb 2007 03:19:54 +0000
Subject: Index creation does a better job of picking up where it left off,
 avoiding unnecessary delete/insert pairs.

---
 .../amazon/carbonado/repo/indexed/ManagedIndex.java    | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/main/java/com/amazon/carbonado/repo/indexed/ManagedIndex.java b/src/main/java/com/amazon/carbonado/repo/indexed/ManagedIndex.java
index 274c452..958bd7b 100644
--- a/src/main/java/com/amazon/carbonado/repo/indexed/ManagedIndex.java
+++ b/src/main/java/com/amazon/carbonado/repo/indexed/ManagedIndex.java
@@ -370,9 +370,21 @@ class ManagedIndex<S extends Storable> implements IndexEntryAccessor<S> {
             for (Object obj : buffer) {
                 Storable indexEntry = (Storable) obj;
                 if (!indexEntry.tryInsert()) {
-                    // repair
-                    indexEntry.tryDelete();
-                    indexEntry.tryInsert();
+                    // Couldn't insert because an index entry already exists.
+                    Storable existing = indexEntry.copy();
+                    if (existing.tryLoad()) {
+                        if (!existing.equalProperties(indexEntry)) {
+                            // Existing entry differs, so update it.
+                            indexEntry.copyUnequalProperties(existing);
+                            existing.tryUpdate();
+                            indexEntry = existing;
+                        }
+                    } else {
+                        // Couldn't find existing entry for some reason, so
+                        // repair by brute force.
+                        indexEntry.tryDelete();
+                        indexEntry.tryInsert();
+                    }
                 }
                 totalInserted++;
                 if (totalInserted % POPULATE_BATCH_SIZE == 0) {
-- 
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