org.apache.lucene.search
Enum CachingWrapperFilter.DeletesMode

java.lang.Object
  java.lang.Enum<CachingWrapperFilter.DeletesMode>
      org.apache.lucene.search.CachingWrapperFilter.DeletesMode

All Implemented Interfaces:

Serializable, Comparable<CachingWrapperFilter.DeletesMode>

Enclosing class:

CachingWrapperFilter

public static enum CachingWrapperFilter.DeletesMode
extends Enum<CachingWrapperFilter.DeletesMode>

Expert: Specifies how new deletions against a reopened reader should be handled.

The default is IGNORE, which means the cache entry will be re-used for a given segment, even when that segment has been reopened due to changes in deletions. This is a big performance gain, especially with near-real-timer readers, since you don't hit a cache miss on every reopened reader for prior segments.

However, in some cases this can cause invalid query results, allowing deleted documents to be returned. This only happens if the main query does not rule out deleted documents on its own, such as a toplevel ConstantScoreQuery. To fix this, use RECACHE to re-create the cached filter (at a higher per-reopen cost, but at faster subsequent search performance), or use DYNAMIC to dynamically intersect deleted docs (fast reopen time but some hit to search performance).

Enum Constant Summary

DYNAMIC

IGNORE

RECACHE

Method Summary

static CachingWrapperFilter.DeletesMode	valueOf(String name) Returns the enum constant of this type with the specified name.
static CachingWrapperFilter.DeletesMode[]	values() Returns an array containing the constants of this enum type, in the order they're declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

IGNORE

public static final CachingWrapperFilter.DeletesMode IGNORE

RECACHE

public static final CachingWrapperFilter.DeletesMode RECACHE

DYNAMIC

public static final CachingWrapperFilter.DeletesMode DYNAMIC

Method Detail

values

public static final CachingWrapperFilter.DeletesMode[] values()

Returns an array containing the constants of this enum type, in the order they're declared. This method may be used to iterate over the constants as follows:

for(CachingWrapperFilter.DeletesMode c : CachingWrapperFilter.DeletesMode.values())
        System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they're declared

valueOf

public static CachingWrapperFilter.DeletesMode valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name