codelipenghui commented on a change in pull request #11621:
URL: https://github.com/apache/pulsar/pull/11621#discussion_r686085678
##########
File path:
managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
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@@ -3202,8 +3203,9 @@ public PositionImpl getPreviousPosition(PositionImpl
position) {
return PositionImpl.get(position.getLedgerId(),
position.getEntryId() - 1);
}
+ final NavigableMap<Long, LedgerInfo> ledgersCopied = new
TreeMap<>(ledgers);
// The previous position will be the last position of an earlier
ledgers
- NavigableMap<Long, LedgerInfo> headMap =
ledgers.headMap(position.getLedgerId(), false);
+ NavigableMap<Long, LedgerInfo> headMap =
ledgersCopied.headMap(position.getLedgerId(), false);
Review comment:
We may have many ledgers if users keep long-term data, copy here might
be expensive, as you can see we have many places that uses the
`getPreviousPosition` method, can we catch the NPE and retry the execution?
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