stillalex commented on code in PR #1504:
URL: https://github.com/apache/solr/pull/1504#discussion_r1163180972


##########
solr/core/src/java/org/apache/solr/update/processor/DistributedUpdateProcessor.java:
##########
@@ -331,7 +342,7 @@ protected boolean versionAdd(AddUpdateCommand cmd) throws 
IOException {
 
     boolean isReplayOrPeersync =
         (cmd.getFlags() & (UpdateCommand.REPLAY | UpdateCommand.PEER_SYNC)) != 
0;
-    boolean leaderLogic = isLeader && !isReplayOrPeersync;
+    boolean leaderLogic = 
leaderLogicWithVersionIntegrityCheck(isReplayOrPeersync, versionOnUpdate);

Review Comment:
   I am not as confident about the above anymore looking at the error traces. 
not sure how, but the test is using CloudSolrClient for some of the requests, I 
am seeing the following in the logs
   ```
     2> 11376 INFO  (Thread-43) [] o.a.s.c.s.i.CloudSolrClient Request to 
collection [collection1] failed due to (400) 
org.apache.solr.client.solrj.impl.BaseHttpSolrClient$RemoteSolrException: Error 
from server at http://127.0.0.1:59362/collection1: missing _version_ on update 
from leader, retry=0 maxRetries=5 commError=false errorCode=400 
   ```
   
   I am considering changing the response code from BAD_REQUEST to 
INVALID_STATE to allow for a retry (same as #1484). thanks for the hint 
@dsmiley, it didn't click when you mentioned it earlier (what was missing was 
the extra check).



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