Key | Default | Type | Description
--- | --- | --- | ---

##### state.backend.forst.cache.lru.access-before-promote

6

Integer

When the number of accesses to a block in cold link reaches this value, the block will be promoted to the head of the LRU list and become a hot link. The evicted file in cache will be reloaded as well. The default value is '5'.

##### state.backend.forst.cache.lru.promote-limit

3

Integer

When the number of eviction that a block in hot link is moved to cold link reaches this value, the block will be blocked from being promoted to the head of the LRU list. The default value is '3'.

##### state.backend.forst.executor.inline-coordinator

false

Boolean

Whether to let the task thread be the coordinator thread responsible for distributing requests. If set to 'true', the task thread will be responsible for distributing requests, otherwise, a dedicated coordinator thread will be used. The default value is 'false'.

##### state.backend.forst.executor.inline-write

true

Boolean

Whether to let write requests be executed within the coordinator thread. If set to 'true', write requests will be executed within the coordinator thread, otherwise, a dedicated write thread will be used. The default value is 'true'.

##### state.backend.forst.local-dir

(none)

String

The local directory (on the TaskManager) where ForSt puts some metadata files. By default, it will be <WORKING_DIR>/tmp. See `process.taskmanager.working-dir` for more details.

##### state.backend.forst.memory.fixed-per-slot

(none)

MemorySize

The fixed total amount of memory per slot, shared among all ForSt instances.This option overrides the 'state.backend.forst.memory.managed' option.

##### state.backend.forst.memory.fixed-per-tm

(none)

MemorySize

The fixed total amount of memory per Task Manager, shared among all ForSt instances. This is a cluster-level option. This option only takes effect if 'state.backend.forst.memory.managed' is set to false and 'state.backend.forst.memory.fixed-per-slot' is not configured. If so, then each ForSt column family state has its own memory caches (as controlled by the column family options). The relevant options for the shared resources (e.g. write-buffer-ratio) can be set on the same level (config.yaml). Note that this feature breaks resource isolation between the slots.

##### state.backend.forst.memory.managed

true

Boolean

If set true, the ForSt state backend will automatically configure itself to use the managed memory budget of the task slot, and divide the memory over write buffers, indexes, block caches, etc.

##### state.backend.forst.options-factory

(none)

String

The options factory class for users to add customized options in DBOptions and ColumnFamilyOptions for ForSt. If set, the ForSt state backend will load the class and apply configs to DBOptions and ColumnFamilyOptions after loading ones from 'ForStConfigurableOptions' and pre-defined options.