wenbingshen commented on code in PR #3329:
URL: https://github.com/apache/bookkeeper/pull/3329#discussion_r916071847


##########
bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/Journal.java:
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@@ -245,7 +246,8 @@ void readLog() {
                     }
                     bb.clear();
                     mark.readLogMark(bb);
-                    if (curMark.compare(mark) < 0) {
+                    // get the minimum mark position from all the ledger 
directories to ensure no data loss.
+                    if (curMark.compare(mark) > 0) {

Review Comment:
   Since we are now replaying the journal from the smallest LogMark, can we get 
the journal log mark position of the current entry to the JournalScanner and 
compare it with the checkpoint position on the ledger disk where the entry to 
be restored is located, and only restore the entry whose logMark position is 
greater than the checkpoint? So as to avoid repeatedly writing the data that 
has been flushed to the disk.



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