wenbingshen commented on code in PR #3683:
URL: https://github.com/apache/bookkeeper/pull/3683#discussion_r1039102570


##########
bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/storage/ldb/SingleDirectoryDbLedgerStorage.java:
##########
@@ -839,6 +839,10 @@ public void checkpoint(Checkpoint checkpoint) throws 
IOException {
             throw e;
         } catch (RuntimeException e) {
             recordFailedEvent(dbLedgerStorageStats.getFlushStats(), startTime);
+            // not wrap IOException again
+            if (e.getCause() != null && e.getCause() instanceof IOException) {

Review Comment:
   @hangc0276 As long as I understand correctly, I believe ` 
writeCacheBeingFlushed forEach ` throws an `IOException` wrapped with a 
`RuntimeException`:
   
https://github.com/apache/bookkeeper/blob/master/bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/storage/ldb/SingleDirectoryDbLedgerStorage.java#L782-L789
   ```java
               writeCacheBeingFlushed.forEach((ledgerId, entryId, entry) -> {
                   try {
                       long location = entryLogger.addEntry(ledgerId, entry);
                       entryLocationIndex.addLocation(batch, ledgerId, entryId, 
location);
                   } catch (IOException e) {
                       throw new RuntimeException(e);
                   }
               });
   ```



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