From dd10a629e0bd28afbf8b909fcc375e160eeee14e Mon Sep 17 00:00:00 2001
From: gavingaozhangmin <gavingaozhangmin@didiglobal.com>
Date: Tue, 10 Aug 2021 19:27:02 +0800
Subject: [PATCH] change ledgersCopied to non concurrent map

---
 .../org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java b/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
index 5e3f522a80178..52cac4bc84b0f 100644
--- a/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
+++ b/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
@@ -48,12 +48,12 @@
 import java.util.Queue;
 import java.util.Random;
 import java.util.Set;
+import java.util.TreeMap;
 import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionException;
 import java.util.concurrent.ConcurrentLinkedDeque;
 import java.util.concurrent.ConcurrentLinkedQueue;
-import java.util.concurrent.ConcurrentNavigableMap;
 import java.util.concurrent.ConcurrentSkipListMap;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ExecutionException;
@@ -3203,7 +3203,7 @@ public PositionImpl getPreviousPosition(PositionImpl position) {
             return PositionImpl.get(position.getLedgerId(), position.getEntryId() - 1);
         }
 
-        final ConcurrentNavigableMap<Long, LedgerInfo> ledgersCopied = new ConcurrentSkipListMap<>(ledgers);
+        final NavigableMap<Long, LedgerInfo> ledgersCopied = new TreeMap<>(ledgers);
         // The previous position will be the last position of an earlier ledgers
         NavigableMap<Long, LedgerInfo> headMap = ledgersCopied.headMap(position.getLedgerId(), false);