Enum CachingWrapperFilter.DeletesMode
- java.lang.Object
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- java.lang.Enum<CachingWrapperFilter.DeletesMode>
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- org.apache.lucene.search.CachingWrapperFilter.DeletesMode
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- 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).
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description 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 are declared.
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Enum Constant Detail
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IGNORE
public static final CachingWrapperFilter.DeletesMode IGNORE
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RECACHE
public static final CachingWrapperFilter.DeletesMode RECACHE
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DYNAMIC
public static final CachingWrapperFilter.DeletesMode DYNAMIC
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Method Detail
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values
public static CachingWrapperFilter.DeletesMode[] values()
Returns an array containing the constants of this enum type, in the order they are 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 are declared
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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 nameNullPointerException
- if the argument is null
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