Class FieldCacheSanityChecker

Provides methods for sanity checking that entries in the FieldCache are not wasteful or inconsistent.

Lucene 2.9 Introduced numerous enhancements into how the FieldCache is used by the low levels of Lucene searching (for Sorting and ValueSourceQueries) to improve both the speed for Sorting, as well as reopening of IndexReaders. But these changes have shifted the usage of FieldCache from "top level" IndexReaders (frequently a MultiReader or DirectoryReader) down to the leaf level SegmentReaders. As a result, existing applications that directly access the FieldCache may find RAM usage increase significantly when upgrading to 2.9 or Later. This class provides an API for these applications (or their Unit tests) to check at run time if the FieldCache contains "insane" usages of the FieldCache.

@lucene.experimental

Inheritance
System.Object
FieldCacheSanityChecker
Namespace: Lucene.Net.Util
Assembly: Lucene.Net.dll
Syntax
public sealed class FieldCacheSanityChecker : object

Constructors

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FieldCacheSanityChecker()

Declaration
public FieldCacheSanityChecker()
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FieldCacheSanityChecker(Boolean)

Declaration
public FieldCacheSanityChecker(bool estimateRam)
Parameters
Type Name Description
System.Boolean estimateRam

If set, estimate size for all FieldCache.CacheEntry objects will be calculated.

Methods

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Check(FieldCache.CacheEntry[])

Tests a CacheEntry[] for indication of "insane" cache usage.

NOTE:FieldCache CreationPlaceholder objects are ignored. (:TODO: is this a bad idea? are we masking a real problem?)

Declaration
public FieldCacheSanityChecker.Insanity[] Check(params FieldCache.CacheEntry[] cacheEntries)
Parameters
Type Name Description
FieldCache.CacheEntry[] cacheEntries
Returns
Type Description
FieldCacheSanityChecker.Insanity[]
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CheckSanity(FieldCache.CacheEntry[])

Quick and dirty convenience method that instantiates an instance with "good defaults" and uses it to test the FieldCache.CacheEntrys

Declaration
public static FieldCacheSanityChecker.Insanity[] CheckSanity(params FieldCache.CacheEntry[] cacheEntries)
Parameters
Type Name Description
FieldCache.CacheEntry[] cacheEntries
Returns
Type Description
FieldCacheSanityChecker.Insanity[]
See Also
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CheckSanity(IFieldCache)

Quick and dirty convenience method

Declaration
public static FieldCacheSanityChecker.Insanity[] CheckSanity(IFieldCache cache)
Parameters
Type Name Description
IFieldCache cache
Returns
Type Description
FieldCacheSanityChecker.Insanity[]
See Also

See Also