core/org.gnit.lucenekmp.store/MMapDirectory/Companion

Companion

object Companion

Properties

val ALL_FILES: (String, IOContext) -> Boolean

Argument for .setPreload that configures all files to be preloaded upon opening them.

BASED_ON_LOAD_IO_CONTEXT

val BASED_ON_LOAD_IO_CONTEXT: (String, IOContext) -> Boolean

Argument for .setPreload that configures files to be preloaded upon opening them if they use the ReadAdvice.RANDOM_PRELOAD advice.

DEFAULT_MAX_CHUNK_SIZE

val DEFAULT_MAX_CHUNK_SIZE: Long

Default max chunk size:

GROUP_BY_SEGMENT

val GROUP_BY_SEGMENT: (String) -> Optional<String>

Argument for .setGroupingFunction that configures grouping by segment.

val NO_FILES: (String, IOContext) -> Boolean

Argument for .setPreload that configures no files to be preloaded upon opening them.

val NO_GROUPING: (String) -> Optional<String>

Argument for .setGroupingFunction that configures no grouping.

val PROVIDER: MMapDirectory.MMapIndexInputProvider<Any>

SHARED_ARENA_MAX_PERMITS_SYSPROP

const val SHARED_ARENA_MAX_PERMITS_SYSPROP: String

This sysprop allows to control the total maximum number of mmapped files that can be associated with a single shared foreign.Arena. For example, to set the max number of permits to 256, pass the following on the command line pass -Dorg.apache.lucene.store.MMapDirectory.sharedArenaMaxPermits=256. Setting a value of 1 associates one file to one shared arena.

Functions

supportsMadvise

fun supportsMadvise(): Boolean

Returns true, if MMapDirectory uses the platform's madvise() syscall to advise how OS kernel should handle paging after opening a file.