copy cat codes problem

[Terry Tan]

Hey ,

anyone can explain for me why copycat do so ,like below , the red part can not garantee thread safety ,which means the log index might be duplicated,

while index is really important in raft ,and can not be duplicated

  /**

   * Applies the given command to the log.

   */

  private void applyCommand(CommandRequest request, ServerSessionContext session, CompletableFuture<CommandResponse> future) {

    final Command command = request.command();

    final long term = context.getTerm();

    final long timestamp = System.currentTimeMillis();

    final long index;

    // Create a CommandEntry and append it to the log.

    try (CommandEntry entry = context.getLog().create(CommandEntry.class)) {

      entry.setTerm(term)

        .setSession(request.session())

        .setTimestamp(timestamp)

        .setSequence(request.sequence())

        .setCommand(command);

      index = context.getLog().append(entry);

      LOGGER.debug("{} - Appended {} to log at index {}", context.getCluster().member().address(), entry, index);

    }