tachyon.worker.eviction

Interface EvictStrategy

All Known Implementing Classes:

EvictLRU, EvictLRUBase, EvictPartialLRU

public interface EvictStrategy

Used to get StorageDir which space is allocated in and blocks that will be evicted to get enough space. because pin file / locked blocks information may be updated after candidate selection, when actually evicting blocks, some blocks may be not allowed to be evicted, it may result in having to try more than one time to get enough space.

Method Summary

Methods

Modifier and Type	Method and Description
Pair<StorageDir,List<BlockInfo>>	getDirCandidate(StorageDir[] storageDirs, Set<Integer> pinList, long requestBytes) Get StorageDir allocated and also get blocks to be evicted among StorageDir candidates

Method Detail

getDirCandidate

Pair<StorageDir,List<BlockInfo>> getDirCandidate(StorageDir[] storageDirs,
                                               Set<Integer> pinList,
                                               long requestBytes)

Get StorageDir allocated and also get blocks to be evicted among StorageDir candidates

Parameters:

storageDirs - StorageDir candidates that the space will be allocated in

pinList - list of pinned file

requestBytes - requested space size in bytes

Returns:

Pair of StorageDir allocated and blockInfoList which contains information of blocks to be evicted, null if no allocated directory is found