mreutegg commented on a change in pull request #274:
URL: https://github.com/apache/jackrabbit-oak/pull/274#discussion_r610558599



##########
File path: 
oak-store-document/src/main/java/org/apache/jackrabbit/oak/plugins/document/DocumentNodeStoreMBeanImpl.java
##########
@@ -264,4 +268,28 @@ public String cleanIndividualCache(String name) {
                 return "ERROR: Invalid cache name received.";
         }
     }
+
+    @Override
+    public String createCheckpoint(String revision, long lifetime, boolean 
force) {
+        Revision rev = Revision.fromString(revision);
+        long oldestTimestamp = nodeStore.getClock().getTime() - 
revisionGCMaxAgeMillis;
+        Revision oldestCheckpoint = 
nodeStore.getCheckpoints().getOldestRevisionToKeep();
+        if (oldestCheckpoint != null) {
+            oldestTimestamp = Math.min(oldestTimestamp, 
oldestCheckpoint.getTimestamp());
+        }
+        if (force || oldestTimestamp < rev.getTimestamp()) {
+            Map<String, String> info = new HashMap<>();
+            info.put(COMPOSITE_INFO + "created", 
Long.toString(rev.getTimestamp()));
+            info.put(COMPOSITE_INFO + "expires", 
Long.toString(Utils.sum(rev.getTimestamp() + lifetime)));
+
+            String cp = nodeStore.getCheckpoints().create(lifetime, info, 
rev).toString();
+            log.info("Created checkpoint [{}] with lifetime {} for Revision 
{}", cp, lifetime, revision);
+            return cp;

Review comment:
       Thanks for the suggestion. I merged your PR.




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