Allowed configurations

Java option	Environment variable	PDS default value
`-Xmx`, `-Xms`	`MAX_HEAP_SIZE`
`-Xmn`	`HEAP_NEWSIZE`
`-Xmx`, `-Xms`	`CASSANDRA_MAX_HEAP`
`-Dcassandra.replace_address`	`CASSANDRA_REPLACE_NODE`
`-Dcassandra.migration_task_wait_in_seconds`	`CASSANDRA_MIGRATION_WAIT`	`1`
`-Dcassandra.ring_delay_ms`	`CASSANDRA_RING_DELAY`	`30000`

Metrics exporter / Logging configuration	Environment variable	PDS default value
	`CASSANDRA_METRICS_MODE`	`basic`
	`CASSANDRA_OPEN_JMX`	`FALSE`
	`CASSANDRA_GC_STDOUT`	`FALSE`

Server configuration	Environment variable	PDS efault value
`dc`	`CASSANDRA_DC`	`DC1`
`rack`	`CASSANDRA_RACK`	`RAC1`
`disk_optimization_strategy`	`CASSANDRA_DISK_OPTIMIZATION_STRATEGY`	`ssd`
`auto_bootstrap`	`CASSANDRA_AUTO_BOOTSTRAP`	`TRUE`
`num_tokens`	`CASSANDRA_NUM_TOKENS`	`32`
`start_rpc`	`CASSANDRA_START_RPC`
`key_cache_size_in_mb`	`CASSANDRA_KEY_CACHE_SIZE_IN_MB`
`concurrent_reads`	`CASSANDRA_CONCURRENT_READS`
`concurrent_writes`	`CASSANDRA_CONCURRENT_WRITES`
`memtable_cleanup_threshold`	`CASSANDRA_MEMTABLE_CLEANUP_THRESHOLD`
`memtable_allocation_type`	`CASSANDRA_MEMTABLE_ALLOCATION_TYPE`
`memtable_flush_writers`	`CASSANDRA_MEMTABLE_FLUSH_WRITERS`
`concurrent_compactors`	`CASSANDRA_CONCURRENT_COMPACTORS`
`compaction_throughput_mb_per_sec`	`CASSANDRA_COMPACTION_THROUGHPUT_MB_PER_SEC`
`counter_cache_size_in_mb`	`CASSANDRA_COUNTER_CACHE_SIZE_IN_MB`
`internode_compression`	`CASSANDRA_INTERNODE_COMPRESSION`
`endpoint_snitch`	`CASSANDRA_ENDPOINT_SNITCH`	`SimpleSnitch`
`gc_warn_threshold_in_ms`	`CASSANDRA_GC_WARN_THRESHOLD_IN_MS`
`listen_interface`	`CASSANDRA_LISTEN_INTERFACE`
`rpc_interface`	`CASSANDRA_RPC_INTERFACE`
	`CASSANDRA_GC_STDOUT`	`FALSE`