poorbarcode commented on code in PR #19913:
URL: https://github.com/apache/pulsar/pull/19913#discussion_r1155096375
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managed-ledger/src/main/java/org/apache/bookkeeper/mledger/LedgerOffloaderFactory.java:
##########
@@ -42,20 +42,37 @@
boolean isDriverSupported(String driverName);
/**
- * Create a ledger offloader with the provided configuration,
user-metadata and scheduler.
+ * Create a ledger offloader with the provided configuration,
user-metadata, scheduler and offloaderStats.
*
* @param offloadPolicies offload policies
* @param userMetadata user metadata
* @param scheduler scheduler
* @return the offloader instance
* @throws IOException when fail to create an offloader
*/
+ T create(OffloadPoliciesImpl offloadPolicies,
+ Map<String, String> userMetadata,
+ OrderedScheduler scheduler)
+ throws IOException;
+
+
+ /**
+ * Create a ledger offloader with the provided configuration,
user-metadata, scheduler and offloaderStats.
+ *
+ * @param offloadPolicies offload policies
+ * @param userMetadata user metadata
+ * @param scheduler scheduler
+ * @param offloaderStats offloaderStats
+ * @return the offloader instance
+ * @throws IOException when fail to create an offloader
+ */
T create(OffloadPoliciesImpl offloadPolicies,
Map<String, String> userMetadata,
OrderedScheduler scheduler,
LedgerOffloaderStats offloaderStats)
throws IOException;
Review Comment:
There are four scenarios:
- `old nar & old broker`: I think it will work.
- `old nar & new broker`: It will not work, and we do not guarantee forward
compatibility. So it is okay.
- `new nar & old broker`: The broker will call the method without `@param
offloaderStats.` I think it will work.
- we should make the method without `@param offloaderStats` non-default.
- `new nar & new broker` I think it will work.
All things are good.
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