Zookeeper set znode size limit to 1MB by default. So we can't start Solr Cloud with some large config files, like synonyms.txt.
Jan Høydahl has a good idea:
"SolrCloud is designed with an assumption that you should be able to upload your whole disk-based conf folder into ZK, and that you should be able to add an empty Solr node to a cluster and it would download all config from ZK. So immediately a splitting strategy automatically handled by ZkSolresourceLoader for large files could be one way forward, i.e. store synonyms.txt as e.g. __001_synonyms.txt __002_synonyms.txt...."