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private void doSend(ClientRequest clientRequest, boolean isInternalRequest, long now) {
...
try {
    NodeApiVersions versionInfo = apiVersions.get(nodeId);
    short version;
    // Note: if versionInfo is null, we have no server version information. This would be
    // the case when sending the initial ApiVersionRequest which fetches the version
    // information itself.  It is also the case when discoverBrokerVersions is set to false.
    if (versionInfo == null) {
        version = builder.latestAllowedVersion();
        if (discoverBrokerVersions && log.isTraceEnabled())
            log.trace("No version information found when sending {} with correlation id {} to node {}. " +
                    "Assuming version {}.", clientRequest.apiKey(), clientRequest.correlationId(), nodeId, version);
    } else {
        version = versionInfo.latestUsableVersion(clientRequest.apiKey(), builder.oldestAllowedVersion(),
                builder.latestAllowedVersion());
    }
 // Check if there is batching optimization, if there is, break them down and send them out one by one:
 // We can use an enum to list all the batch-optimized API here.
if (builder.apiKey() == FIND_COORDINATOR){
    for (AbstractRequest request: ((FindCoordinatorRequest.Builder) builder).buildToList(version)){
        doSend(clientRequest, isInternalRequest, now, request);
    }
} else {
    doSend(clientRequest, isInternalRequest, now, builder.build(version));
}
 ...
}