com.hazelcast.map.impl.recordstore

Interface ForcedEvictable<T>

Type Parameters:

T -

All Known Implementing Classes:

HDStorageImpl, HotRestartHDStorageImpl

public interface ForcedEvictable<T>

Mark Storage as capable of running forced-evictions. It's surprisingly difficult to mass-remove entries without creating clusters after a few cycles. Data structures like Open Addressing Hash Map with linear probing are very prone to clustering. This leads to a performance degradation. Iterator returned by newForcedEvictionValuesIterator() is optimized for mass removals and it should do its best to prevent data clustering.

Method Summary

Modifier and Type	Method and Description
Iterator<T>	newForcedEvictionValuesIterator() Return iterator to be used for forced evictions.

Method Detail

newForcedEvictionValuesIterator

Iterator<T> newForcedEvictionValuesIterator()

Return iterator to be used for forced evictions. This is not a general-purpose iterator, it's intended to be used exclusively for evictions. It does not guarantee to iterate over all entries and it can give you the same entries twice. This iterator does not have a fail-fast semantic. A caller can use Iterator.remove() method to remove a current record or a Storage.removeRecord(Object) - but it's only allowed to remove a record the iterator is currently pointing to. No other modification of the underlying storage is allowed while using this iterator.

Returns: