dlg99 commented on code in PR #3620:
URL: https://github.com/apache/bookkeeper/pull/3620#discussion_r1016930482
##########
bookkeeper-server/src/main/java/org/apache/bookkeeper/client/PendingAddOp.java:
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@@ -266,6 +266,10 @@ public void run() {
// We are about to send. Check if we need to make an ensemble change
// because of delayed write errors
lh.maybeHandleDelayedWriteBookieFailure();
+ // This op maybe recycled during bookie failures
+ if (maybeRecycled()) {
Review Comment:
>> Another side of the problem is that pending add opp can be recycled and
immediately reused by another add.
> I don't understand this very well, can you explain in more detail?
```java
lh.maybeHandleDelayedWriteBookieFailure();
// Add Op is recycled at this point, maybeRecycled() has a chance to
check lh == null
// but the recycler can give that op to another thread/request (via
RECYCLER.get() call)
// so it can be re-initialized with different lh and other data
// so maybeRecycled returns false and the rest of the method is
executed against different op
// to avoid such problems and avoid locks we use ordered executors /
guarantee order of calls
if (maybeRecycled()) {
```
@zhaohaidao I hope this helps
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