ascherbakoff commented on code in PR #4821:
URL: https://github.com/apache/ignite-3/pull/4821#discussion_r1896665963


##########
modules/raft-api/src/main/java/org/apache/ignite/internal/raft/Command.java:
##########
@@ -17,10 +17,27 @@
 
 package org.apache.ignite.internal.raft;
 
+import org.apache.ignite.internal.hlc.HybridTimestamp;
 import org.apache.ignite.internal.network.NetworkMessage;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * A marker interface for replication group command.
  */
 public interface Command extends NetworkMessage {
+    /**
+     * This is called before a command is submitted to replication pipeline.
+     *
+     * @param safeTs Safe timestamp.
+     */
+    default void patch(HybridTimestamp safeTs) {}

Review Comment:
   I think I got you.
   Reading safeTime after patching the class in another thread is not thread 
safe in the current implementation. This is mutability consequences.
   Javadoc on safeTime already mentions special processing for this field:
   /** The Safe timestamp. A value for this field is auto generated and should 
not be set manually. */
   So it should never be read back.
   Thread safety issues can be fixed by cloning the command before submitting 
it to raft, but IMO doesn't give any profit.



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