blaze.edn

;;
;; This file contains the configuration of Blaze components forming a system.
;;
;; The two main sections are the :base-config and the :features, were
;; :base-config contains mandatory components and :features contains optional
;; components which are enabled based on feature flags.
;;
;; Each config entry consists of a component key like :blaze/rest-api and a
;; component config map. Component keys follow the namespaces the components are
;; defined in. The corresponding namespaces will be loaded automatically before
;; the system is initialized. Component config maps can contain normal values
;; and references to other components. The reader tag #blaze/ref is used to
;; specify a reference. Keys in references can be component keys itself or super
;; keys like :blaze.db/index-kv-store which are provided by concrete components.
;;

{:base-config
 {
  ;;
  ;; FHIR RESTful API
  ;;
  ;; Provides the FHIR RESTful API which is the public interface of Blaze. The
  ;; namespace blaze/rest-api can be found in the rest-api module. The rest-api
  ;; depends on FHIR interactions and operations.
  ;;
  ;; Resource patterns offer control over which interactions are enabled for
  ;; which resource type. The default configuration enables all interactions for
  ;; all resource types.
  ;;
  :blaze/rest-api
  {:search-system-handler #blaze/ref :blaze.interaction/search-system
   :transaction-handler #blaze/ref :blaze.interaction/transaction
   :history-system-handler #blaze/ref :blaze.interaction.history/system
   :resource-patterns
   [#:blaze.rest-api.resource-pattern
       {:type :default
        :interactions
        {:read
         #:blaze.rest-api.interaction
             {:handler #blaze/ref :blaze.interaction/read}
         :vread
         #:blaze.rest-api.interaction
             {:handler #blaze/ref :blaze.interaction/read}
         :update
         #:blaze.rest-api.interaction
             {:handler #blaze/ref :blaze.interaction/update}
         :delete
         #:blaze.rest-api.interaction
             {:handler #blaze/ref :blaze.interaction/delete}
         :history-instance
         #:blaze.rest-api.interaction
             {:handler #blaze/ref :blaze.interaction.history/instance}
         :history-type
         #:blaze.rest-api.interaction
             {:handler #blaze/ref :blaze.interaction.history/type}
         :create
         #:blaze.rest-api.interaction
             {:handler #blaze/ref :blaze.interaction/create}
         :search-type
         #:blaze.rest-api.interaction
             {:handler #blaze/ref :blaze.interaction/search-type}}}]
   :compartments
   [#:blaze.rest-api.compartment
       {:code "Patient"
        :search-handler #blaze/ref :blaze.interaction/search-compartment}]
   :operations
   [#:blaze.rest-api.operation
       {:code "evaluate-measure"
        :def-uri "http://hl7.org/fhir/OperationDefinition/Measure-evaluate-measure"
        :resource-types ["Measure"]
        :type-handler #blaze/ref :blaze.fhir.operation.evaluate-measure/handler
        :instance-handler #blaze/ref :blaze.fhir.operation.evaluate-measure/handler}
    #:blaze.rest-api.operation
       {:code "graphql"
        :def-uri "http://hl7.org/fhir/OperationDefinition/Resource-graphql"
        :resource-types ["Resource"]
        :post-middleware #blaze/ref :blaze.fhir.operation.graphql.middleware/query
        :response-type :json
        :system-handler #blaze/ref :blaze.fhir.operation.graphql/handler}]
   :enforce-referential-integrity #blaze/cfg ["ENFORCE_REFERENTIAL_INTEGRITY" boolean? true]}

  ;;
  ;; FHIR Interactions
  ;;
  ;; FHIR interactions implement most of the RESTful API. There are system, type
  ;; and instance level interactions. Interactions are referred by the rest-api
  ;; above. All interactions depend on the database node :blaze.db/node which
  ;; provides read and write access to the actual resources.
  ;;
  :blaze.interaction.history/system
  {:clock #blaze/ref :blaze/clock
   :rng-fn #blaze/ref :blaze/rng-fn}

  :blaze.interaction.history/type
  {:clock #blaze/ref :blaze/clock
   :rng-fn #blaze/ref :blaze/rng-fn}

  :blaze.interaction.history/instance
  {:clock #blaze/ref :blaze/clock
   :rng-fn #blaze/ref :blaze/rng-fn}

  :blaze.interaction/create
  {:node #blaze/ref :blaze.db/node
   :executor #blaze/ref :blaze.server/executor
   :clock #blaze/ref :blaze/clock
   :rng-fn #blaze/ref :blaze/rng-fn}

  :blaze.interaction/delete
  {:node #blaze/ref :blaze.db/node
   :executor #blaze/ref :blaze.server/executor}

  :blaze.interaction/read {}

  :blaze.interaction/search-system
  {:clock #blaze/ref :blaze/clock
   :rng-fn #blaze/ref :blaze/rng-fn
   :page-store #blaze/ref :blaze/page-store}

  :blaze.interaction/search-type
  {:clock #blaze/ref :blaze/clock
   :rng-fn #blaze/ref :blaze/rng-fn
   :page-store #blaze/ref :blaze/page-store}

  :blaze.interaction/search-compartment
  {:clock #blaze/ref :blaze/clock
   :rng-fn #blaze/ref :blaze/rng-fn
   :page-store #blaze/ref :blaze/page-store}

  :blaze.interaction/transaction
  {:node #blaze/ref :blaze.db/node
   :executor #blaze/ref :blaze.interaction.transaction/executor
   :clock #blaze/ref :blaze/clock
   :rng-fn #blaze/ref :blaze/rng-fn}

  :blaze.interaction.transaction/executor {}

  :blaze.interaction/update
  {:node #blaze/ref :blaze.db/node
   :executor #blaze/ref :blaze.server/executor}

  ;;
  ;; FHIR Operation Evaluate Measure
  ;;
  ;; Special operation which enables Blaze to evaluate Measure resources,
  ;; producing MeasureReports. The operation gets it's own executor with
  ;; FHIR_OPERATION_EVALUATE_MEASURE_THREADS many threads on order to not occupy
  ;; regular server threads. The metrics compile-duration-seconds and
  ;; evaluate-duration-seconds are exported.
  ;;
  :blaze.fhir.operation.evaluate-measure/handler
  {:node #blaze/ref :blaze.db/node
   :executor #blaze/ref :blaze.fhir.operation.evaluate-measure/executor
   :clock #blaze/ref :blaze/clock
   :rng-fn #blaze/ref :blaze/rng-fn
   :timeout #blaze/ref :blaze.fhir.operation.evaluate-measure/timeout}

  :blaze.fhir.operation.evaluate-measure/timeout
  {:millis #blaze/cfg ["FHIR_OPERATION_EVALUATE_MEASURE_TIMEOUT" nat-int? 3600000]}

  :blaze.fhir.operation.evaluate-measure/executor
  {:num-threads #blaze/cfg ["FHIR_OPERATION_EVALUATE_MEASURE_THREADS" pos-int? 4]}

  :blaze.fhir.operation.evaluate-measure/compile-duration-seconds {}
  :blaze.fhir.operation.evaluate-measure/evaluate-duration-seconds {}

  ;;
  ;; FHIR Operation GraphQL
  ;;
  :blaze.fhir.operation.graphql/handler
  {:node #blaze/ref :blaze.db/node
   :executor #blaze/ref :blaze.fhir.operation.graphql/executor}

  :blaze.fhir.operation.graphql/executor
  {:num-threads #blaze/cfg ["FHIR_OPERATION_GRAPHQL_THREADS" pos-int? 4]}

  :blaze.fhir.operation.graphql.middleware/query {}

  ;;
  ;; Database Node
  ;;
  ;; The database node offers the implementation of the database which is used
  ;; by FHIR interactions and operations. The database node depends on:
  ;;
  ;;  :tx-log - a central transaction log, were all transactions are submitted
  ;;            in order to get replicated to all other nodes
  ;;
  ;;  :tx-indexer - the local indexer for transactions
  ;;
  ;;  :resource-cache - an in-memory cache of decoded resources
  ;;
  ;;  :kv-store - the actual key-value store holding all resources and indices
  ;;
  ;;  :search-param-registry - a registry of search params used for query
  ;;                           functionality
  ;;
  ;; The resource cache collector exports metrics of the resource cache.
  ;;
  :blaze.db/node
  {:tx-log #blaze/ref :blaze.db/tx-log
   :resource-handle-cache #blaze/ref :blaze.db/resource-handle-cache
   :tx-cache #blaze/ref :blaze.db/tx-cache
   :indexer-executor #blaze/ref :blaze.db.node/indexer-executor
   :resource-store #blaze/ref :blaze.db/resource-cache
   :kv-store #blaze/ref :blaze.db/index-kv-store
   :resource-indexer #blaze/ref :blaze.db.node/resource-indexer
   :search-param-registry #blaze/ref :blaze.db/search-param-registry
   :enforce-referential-integrity #blaze/cfg ["ENFORCE_REFERENTIAL_INTEGRITY" boolean? true]}

  :blaze.db.node/indexer-executor {}

  :blaze.db.node/duration-seconds {}
  :blaze.db.node/transaction-sizes {}

  :blaze.db.node/resource-indexer
  {:kv-store #blaze/ref :blaze.db/index-kv-store
   :resource-store #blaze/ref :blaze.db/resource-cache
   :search-param-registry #blaze/ref :blaze.db/search-param-registry
   :executor #blaze/ref :blaze.db.node.resource-indexer/executor}

  :blaze.db.node.resource-indexer/executor
  {:num-threads #blaze/cfg ["DB_RESOURCE_INDEXER_THREADS" pos-int? 4]}

  :blaze.db.node.resource-indexer/duration-seconds {}
  :blaze.db.node.resource-indexer/index-entries {}

  :blaze.db.node.tx-indexer/duration-seconds {}

  :blaze.db/cache-collector
  {:caches
   {"resource-handle-cache" #blaze/ref :blaze.db/resource-handle-cache
    "tx-cache" #blaze/ref :blaze.db/tx-cache
    "resource-cache" #blaze/ref :blaze.db/resource-cache}}

  ;;
  ;; Resource Handle Cache
  ;;
  ;; The resource handle cache holds resource handles keyed by tuples of
  ;; [tid id t]. It avoids seeks in the ResourceAsOf index.
  ;;
  ;; The env var DB_RESOURCE_HANDLE_CACHE_SIZE can be used to specify the
  ;; maximum number of resource handles, the cache can hold. A resource handle
  ;; weights in about 200 bytes of memory. Please choose a cache size depending
  ;; on your use case while monitoring JVM heap size.
  ;;
  :blaze.db/resource-handle-cache
  {:max-size #blaze/cfg ["DB_RESOURCE_HANDLE_CACHE_SIZE" nat-int? 100000]}

  ;;
  ;; Transaction Cache
  ;;
  ;; The transaction cache holds transaction data that currently only consists
  ;; of the instant at which the transaction happened. Transaction data is keyed
  ;; by t.
  ;;
  :blaze.db/tx-cache
  {:kv-store #blaze/ref :blaze.db/index-kv-store
   :max-size #blaze/cfg ["DB_TRANSACTION_CACHE_SIZE" nat-int? 100000]}

  ;;
  ;; Resource Cache
  ;;
  ;; The resource cache holds already decoded FHIR resources keyed by their
  ;; content hashes. It speeds up access to resources which are stored in the
  ;; key-value store in encoded format.
  ;;
  ;; The env var DB_RESOURCE_CACHE_SIZE can be used to specify the maximum
  ;; number of resources, the cache can hold. Please note that the actual memory
  ;; size used depends on resource sizes. Please choose a cache size depending
  ;; on your use case while monitoring JVM heap size.
  ;;
  :blaze.db/resource-cache
  {:resource-store #blaze/ref :blaze.db/resource-store
   :max-size #blaze/cfg ["DB_RESOURCE_CACHE_SIZE" nat-int? 100000]}

  ;;
  ;; Search Param Registry
  ;;
  ;; The search param registry contains a set of FHIR search parameter
  ;; definitions which are used for query functionality in the database node.
  ;; Currently, this implementation holds a fix set of search parameters defined
  ;; in FHIR R4.
  ;;
  :blaze.db/search-param-registry
  {:structure-definition-repo #blaze/ref :blaze.fhir/structure-definition-repo}}

 :storage
 {:in-memory
  {
   ;;
   ;; In-Memory, Volatile Index Store
   ;;
   ;; In-memory, volatile key-value store implementation for demonstration
   ;; purposes in case no local directory is available. Can be referred by the
   ;; super key :blaze.db/index-kv-store.
   ;;
   [:blaze.db.kv/mem :blaze.db/index-kv-store]
   {:column-families
    {:search-param-value-index nil
     :resource-value-index nil
     :compartment-search-param-value-index nil
     :compartment-resource-type-index nil
     :active-search-params nil
     :tx-success-index {:reverse-comparator? true}
     :tx-error-index nil
     :t-by-instant-index {:reverse-comparator? true}
     :resource-as-of-index nil
     :type-as-of-index nil
     :system-as-of-index nil
     :type-stats-index nil
     :system-stats-index nil}}

   ;;
   ;; Local Transaction Log for Single Node Deployments
   ;;
   ;; Can be referred by the super key :blaze.db/tx-log. The local transaction
   ;; log uses a key-value store to persist transactions.
   ;;
   :blaze.db.tx-log/local
   {:kv-store #blaze/ref :blaze.db/transaction-kv-store
    :clock #blaze/ref :blaze/clock}

   :blaze.db.tx-log.local/duration-seconds {}

   ;;
   ;; In-Memory, Volatile Transaction Store
   ;;
   ;; In-memory, volatile key-value store implementation for demonstration
   ;; purposes in case no local directory is available. Can be referred by the
   ;; super key :blaze.db/transaction-kv-store.
   ;;
   [:blaze.db.kv/mem :blaze.db/transaction-kv-store]
   {:column-families {}}

   ;;
   ;; Key-Value Resource Store
   ;;
   ;; Can be referred by the super key :blaze.db/resource-store.
   ;;
   :blaze.db.resource-store/kv
   {:kv-store #blaze/ref :blaze.db/resource-kv-store
    :executor #blaze/ref :blaze.db.resource-store.kv/executor}

   :blaze.db.resource-store.kv/executor
   {:num-threads #blaze/cfg ["DB_RESOURCE_STORE_KV_THREADS" pos-int? 4]}

   :blaze.db.resource-store.kv/resource-bytes {}
   :blaze.db.resource-store.kv/duration-seconds {}

   ;;
   ;; In-Memory, Volatile Key-Value Store Resource Store Backend
   ;;
   ;; In-memory, volatile key-value store implementation for demonstration
   ;; purposes in case no local directory is available. Can be referred by the
   ;; super key :blaze.db/resource-kv-store.
   ;;
   [:blaze.db.kv/mem :blaze.db/resource-kv-store]
   {:column-families {}}

   ;;
   ;; Local Page Store
   ;;
   ;; Can be referred by the super key :blaze.db/resource-store.
   ;;
   :blaze.page-store/local
   {:secure-rng #blaze/ref :blaze/secure-rng}}

  :standalone
  {
   ;;
   ;; RocksDB Index Store
   ;;
   [:blaze.db.kv/rocksdb :blaze.db/index-kv-store]
   {:dir #blaze/cfg ["INDEX_DB_DIR" string? "index"]
    :block-cache #blaze/ref :blaze.db.kv.rocksdb/block-cache
    :stats #blaze/ref :blaze.db.index-kv-store/stats
    :opts
    {:wal-dir #blaze/cfg ["INDEX_DB_WAL_DIR" string? ""]
     :max-background-jobs
     #blaze/cfg ["DB_MAX_BACKGROUND_JOBS" int? 4]
     :compaction-readahead-size
     #blaze/cfg ["DB_COMPACTION_READAHEAD_SIZE" int? 0]}
    :column-families
    {:search-param-value-index
     {:write-buffer-size-in-mb 64
      :max-bytes-for-level-base-in-mb 512
      :target-file-size-base-in-mb 64
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :resource-value-index
     {:write-buffer-size-in-mb 64
      :max-bytes-for-level-base-in-mb 512
      :target-file-size-base-in-mb 64
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :compartment-search-param-value-index
     {:write-buffer-size-in-mb 64
      :max-bytes-for-level-base-in-mb 512
      :target-file-size-base-in-mb 64
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :compartment-resource-type-index
     {:write-buffer-size-in-mb 4
      :max-bytes-for-level-base-in-mb 16
      :target-file-size-base-in-mb 4
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :active-search-params
     {:block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :tx-success-index
     {:write-buffer-size-in-mb 2
      :max-bytes-for-level-base-in-mb 8
      :target-file-size-base-in-mb 2
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]
      :reverse-comparator? true}

     :tx-error-index
     {:write-buffer-size-in-mb 2
      :max-bytes-for-level-base-in-mb 8
      :target-file-size-base-in-mb 2
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :t-by-instant-index
     {:write-buffer-size-in-mb 2
      :max-bytes-for-level-base-in-mb 8
      :target-file-size-base-in-mb 2
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]
      :reverse-comparator? true}

     :resource-as-of-index
     {:write-buffer-size-in-mb 8
      :max-bytes-for-level-base-in-mb 32
      :target-file-size-base-in-mb 8
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :type-as-of-index
     {:write-buffer-size-in-mb 8
      :max-bytes-for-level-base-in-mb 32
      :target-file-size-base-in-mb 8
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :system-as-of-index
     {:write-buffer-size-in-mb 8
      :max-bytes-for-level-base-in-mb 32
      :target-file-size-base-in-mb 8
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :type-stats-index
     {:write-buffer-size-in-mb 2
      :max-bytes-for-level-base-in-mb 8
      :target-file-size-base-in-mb 2
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :system-stats-index
     {:write-buffer-size-in-mb 2
      :max-bytes-for-level-base-in-mb 8
      :target-file-size-base-in-mb 2
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}}}

   [:blaze.db.kv.rocksdb/stats :blaze.db.index-kv-store/stats] {}

   ;;
   ;; Local Transaction Log for Single Node Deployments
   ;;
   ;; Can be referred by the super key :blaze.db/tx-log. The local transaction
   ;; log uses a key-value store to persist transactions.
   ;;
   :blaze.db.tx-log/local
   {:kv-store #blaze/ref :blaze.db/transaction-kv-store
    :clock #blaze/ref :blaze/clock}

   :blaze.db.tx-log.local/duration-seconds {}

   ;;
   ;; RocksDB Transaction Store
   ;;
   ;; Needed by :blaze.db.tx-log/local.
   ;;
   [:blaze.db.kv/rocksdb :blaze.db/transaction-kv-store]
   {:dir #blaze/cfg ["TRANSACTION_DB_DIR" string? "transaction"]
    :block-cache #blaze/ref :blaze.db.kv.rocksdb/block-cache
    :stats #blaze/ref :blaze.db.transaction-kv-store/stats
    :opts
    {:wal-dir #blaze/cfg ["TRANSACTION_DB_WAL_DIR" string? ""]
     :max-background-jobs #blaze/cfg ["DB_MAX_BACKGROUND_JOBS" int? 4]
     :compaction-readahead-size #blaze/cfg ["DB_COMPACTION_READAHEAD_SIZE" int? 0]}
    :column-families
    {:default
     {:write-buffer-size-in-mb 8
      :max-bytes-for-level-base-in-mb 32
      :target-file-size-base-in-mb 3
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}}}

   [:blaze.db.kv.rocksdb/stats :blaze.db.transaction-kv-store/stats] {}

   ;;
   ;; Key-Value Resource Store
   ;;
   ;; Can be referred by the super key :blaze.db/resource-store.
   ;;
   :blaze.db.resource-store/kv
   {:kv-store #blaze/ref :blaze.db/resource-kv-store
    :executor #blaze/ref :blaze.db.resource-store.kv/executor}

   :blaze.db.resource-store.kv/executor
   {:num-threads #blaze/cfg ["DB_RESOURCE_STORE_KV_THREADS" pos-int? 4]}

   :blaze.db.resource-store.kv/resource-bytes {}
   :blaze.db.resource-store.kv/duration-seconds {}

   ;;
   ;; RocksDB Key-Value Store Resource Store Backend
   ;;
   [:blaze.db.kv/rocksdb :blaze.db/resource-kv-store]
   {:dir #blaze/cfg ["RESOURCE_DB_DIR" string? "resource"]
    :block-cache #blaze/ref :blaze.db.kv.rocksdb/block-cache
    :stats #blaze/ref :blaze.db.resource-kv-store/stats
    :opts
    {:wal-dir #blaze/cfg ["RESOURCE_DB_WAL_DIR" string? ""]
     :max-background-jobs #blaze/cfg ["DB_MAX_BACKGROUND_JOBS" int? 4]
     :compaction-readahead-size #blaze/cfg ["DB_COMPACTION_READAHEAD_SIZE" int? 0]}
    :column-families
    {:default
     {:write-buffer-size-in-mb 64
      :max-bytes-for-level-base-in-mb 256
      :target-file-size-base-in-mb 26
      ;; According to Synthea test data, a resource has an average size of
      ;; 1300 bytes. So a block with a size of 16 kb will hold about 10
      ;; resources in average.
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]
      :bloom-filter? true
      :memtable-whole-key-filtering? true
      ;; every get() in the resource store should be a hit
      :optimize-filters-for-hits? true}}}

   [:blaze.db.kv.rocksdb/stats :blaze.db.resource-kv-store/stats] {}

   :blaze.db.kv.rocksdb/block-cache
   {:size-in-mb #blaze/cfg ["DB_BLOCK_CACHE_SIZE" int? 128]}

   :blaze.db.kv.rocksdb/env {}

   :blaze.db.kv.rocksdb/stats-collector
   {:stats
    [["index" #blaze/ref :blaze.db.index-kv-store/stats]
     ["transaction" #blaze/ref :blaze.db.transaction-kv-store/stats]
     ["resource" #blaze/ref :blaze.db.resource-kv-store/stats]]}

   ;;
   ;; Local Page Store
   ;;
   ;; Can be referred by the super key :blaze.db/resource-store.
   ;;
   :blaze.page-store/local
   {:secure-rng #blaze/ref :blaze/secure-rng}}

  :distributed
  {
   ;;
   ;; RocksDB Index Store
   ;;
   ;; Currently the only durable option. Can be referred by the super key
   ;; :blaze.db/index-kv-store. Will be enabled if a INDEX_DB_DIR is set.
   ;;
   [:blaze.db.kv/rocksdb :blaze.db/index-kv-store]
   {:dir #blaze/cfg ["INDEX_DB_DIR" string?]
    :block-cache #blaze/ref :blaze.db.kv.rocksdb/block-cache
    :stats #blaze/ref :blaze.db.index-kv-store/stats
    :opts
    {:wal-dir #blaze/cfg ["INDEX_DB_WAL_DIR" string? ""]
     :max-background-jobs #blaze/cfg ["DB_MAX_BACKGROUND_JOBS" int? 4]
     :compaction-readahead-size #blaze/cfg ["DB_COMPACTION_READAHEAD_SIZE" int? 0]}
    :column-families
    {:search-param-value-index
     {:write-buffer-size-in-mb 64
      :max-bytes-for-level-base-in-mb 512
      :target-file-size-base-in-mb 64
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :resource-value-index
     {:write-buffer-size-in-mb 64
      :max-bytes-for-level-base-in-mb 512
      :target-file-size-base-in-mb 64
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :compartment-search-param-value-index
     {:write-buffer-size-in-mb 64
      :max-bytes-for-level-base-in-mb 512
      :target-file-size-base-in-mb 64
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :compartment-resource-type-index
     {:write-buffer-size-in-mb 4
      :max-bytes-for-level-base-in-mb 16
      :target-file-size-base-in-mb 4
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :active-search-params
     {:block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :tx-success-index
     {:write-buffer-size-in-mb 2
      :max-bytes-for-level-base-in-mb 8
      :target-file-size-base-in-mb 2
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]
      :reverse-comparator? true}

     :tx-error-index
     {:write-buffer-size-in-mb 2
      :max-bytes-for-level-base-in-mb 8
      :target-file-size-base-in-mb 2
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :t-by-instant-index
     {:write-buffer-size-in-mb 2
      :max-bytes-for-level-base-in-mb 8
      :target-file-size-base-in-mb 2
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]
      :reverse-comparator? true}

     :resource-as-of-index
     {:write-buffer-size-in-mb 8
      :max-bytes-for-level-base-in-mb 32
      :target-file-size-base-in-mb 8
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :type-as-of-index
     {:write-buffer-size-in-mb 8
      :max-bytes-for-level-base-in-mb 32
      :target-file-size-base-in-mb 8
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :system-as-of-index
     {:write-buffer-size-in-mb 8
      :max-bytes-for-level-base-in-mb 32
      :target-file-size-base-in-mb 8
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :type-stats-index
     {:write-buffer-size-in-mb 2
      :max-bytes-for-level-base-in-mb 8
      :target-file-size-base-in-mb 2
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}

     :system-stats-index
     {:write-buffer-size-in-mb 2
      :max-bytes-for-level-base-in-mb 8
      :target-file-size-base-in-mb 2
      :block-size #blaze/cfg ["DB_BLOCK_SIZE" int? 16384]}}}

   :blaze.db.kv.rocksdb/block-cache
   {:size-in-mb #blaze/cfg ["DB_BLOCK_CACHE_SIZE" int? 128]}

   :blaze.db.kv.rocksdb/env {}

   [:blaze.db.kv.rocksdb/stats :blaze.db.index-kv-store/stats] {}

   :blaze.db.kv.rocksdb/stats-collector
   {:stats
    [["index" #blaze/ref :blaze.db.index-kv-store/stats]]}

   ;;
   ;; Kafka Transaction Log
   ;;
   :blaze.db.tx-log/kafka
   {:bootstrap-servers #blaze/cfg ["DB_KAFKA_BOOTSTRAP_SERVERS" string? "localhost:9092"]
    :last-t-executor #blaze/ref :blaze.db.tx-log.kafka/last-t-executor
    :max-request-size #blaze/cfg ["DB_KAFKA_MAX_REQUEST_SIZE" nat-int? 1048576]
    :compression-type #blaze/cfg ["DB_KAFKA_COMPRESSION_TYPE" string? "snappy"]
    :security-protocol #blaze/cfg ["DB_KAFKA_SECURITY_PROTOCOL" string? "PLAINTEXT"]
    :ssl-truststore-location #blaze/cfg ["DB_KAFKA_SSL_TRUSTSTORE_LOCATION" string?]
    :ssl-truststore-password #blaze/cfg ["DB_KAFKA_SSL_TRUSTSTORE_PASSWORD" string?]
    :ssl-keystore-location #blaze/cfg ["DB_KAFKA_SSL_KEYSTORE_LOCATION" string?]
    :ssl-keystore-password #blaze/cfg ["DB_KAFKA_SSL_KEYSTORE_PASSWORD" string?]
    :ssl-key-password #blaze/cfg ["DB_KAFKA_SSL_KEY_PASSWORD" string?]}

   :blaze.db.tx-log.kafka/last-t-executor {}
   :blaze.db.tx-log.kafka/duration-seconds {}

   ;;
   ;; Cassandra Resource Store
   ;;
   ;; Can be referred by the super key :blaze.db/resource-store.
   ;;
   :blaze.db.resource-store/cassandra
   {:contact-points #blaze/cfg ["DB_CASSANDRA_CONTACT_POINTS" string? "localhost:9042"]
    :username #blaze/cfg ["DB_CASSANDRA_USERNAME" string? "cassandra"]
    :password #blaze/cfg ["DB_CASSANDRA_PASSWORD" string? "cassandra"]
    :key-space #blaze/cfg ["DB_CASSANDRA_KEY_SPACE" string? "blaze"]
    :put-consistency-level #blaze/cfg ["DB_CASSANDRA_PUT_CONSISTENCY_LEVEL" string? "TWO"]
    :max-concurrent-requests #blaze/cfg ["DB_CASSANDRA_MAX_CONCURRENT_REQUESTS" nat-int? 1024]
    :max-request-queue-size #blaze/cfg ["DB_CASSANDRA_MAX_REQUEST_QUEUE_SIZE" nat-int? 100000]
    :request-timeout #blaze/cfg ["DB_CASSANDRA_REQUEST_TIMEOUT" pos-int? 2000]}

   :blaze.db.resource-store.cassandra/duration-seconds {}

   :blaze.db.resource-store.cassandra/resource-bytes {}

   ;;
   ;; Cassandra Page Store
   ;;
   ;; Can be referred by the super key :blaze/page-store.
   ;;
   :blaze.page-store/cassandra
   {:secure-rng #blaze/ref :blaze/secure-rng
    :contact-points #blaze/cfg ["DB_CASSANDRA_CONTACT_POINTS" string? "localhost:9042"]
    :username #blaze/cfg ["DB_CASSANDRA_USERNAME" string? "cassandra"]
    :password #blaze/cfg ["DB_CASSANDRA_PASSWORD" string? "cassandra"]
    :key-space #blaze/cfg ["DB_CASSANDRA_KEY_SPACE" string? "blaze"]
    :put-consistency-level #blaze/cfg ["DB_CASSANDRA_PUT_CONSISTENCY_LEVEL" string? "TWO"]
    :max-concurrent-requests #blaze/cfg ["DB_CASSANDRA_MAX_CONCURRENT_REQUESTS" nat-int? 1024]
    :max-request-queue-size #blaze/cfg ["DB_CASSANDRA_MAX_REQUEST_QUEUE_SIZE" nat-int? 100000]
    :request-timeout #blaze/cfg ["DB_CASSANDRA_REQUEST_TIMEOUT" pos-int? 2000]}

   :blaze.page-store.cassandra/duration-seconds {}

   :blaze.page-store.cassandra/resource-bytes {}}}

 :features
 [
  ;;
  ;; OpenID Authentication
  ;;
  ;; Can be referred by the super key :blaze.auth/backend. Will be enabled if an
  ;; OPENID_PROVIDER_URL is set.
  ;;
  {:name "OpenID Authentication"
   :toggle "OPENID_PROVIDER_URL"
   :config
   {:blaze.openid-auth/backend
    {:http-client #blaze/ref :blaze/http-client
     :scheduler #blaze/ref :blaze/scheduler
     :provider-url #blaze/cfg ["OPENID_PROVIDER_URL" string?]}

    :blaze/http-client {}

    :blaze/scheduler {}}}]}