Note that this functionality will only work if the directory with the fasta is writeable. GATK will fail if directory is read only and and either the .fasta.fai or .dict files don't exist. In the future, we could have these references be created in memory, but we decided against it this time.
Locking was also added to ReferenceDataSource so no issues come up while running multiple GATKs on the same reference: we don't want one process to be half-finished and another try to read it. So, you could see error messages related to locking. See ReferenceDataSource.java for explanation of the locking strategy.
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