Normally Region splits in HBase is lightweight (the major delay could be attributed by a reference link file creation RPC call to Namenode) and hence should be pretty fast unless NN is undergoing performance issue. If client access this region during this timeframe, it may experience the said exception but that should be transient, transparent and non-fatal to the client application. Do you see any fatal errors at your client application? Do you have customized retry attempts in your client?
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