GroupDocs.Search for .NET 18.2 Release Notes

Major Features

There are 3 enhancements in this regular monthly release. The most notable are:

• Implement compact index feature
• Implement option for multithreaded indexing 
• Improve index structure to increase indexing speed

All Changes

Public API and Backward Incompatible Changes

Implement compact index feature

Description

This feature allows creating index that consumes up to 5 times less disk space.This is possible for the reason of containing the only number of word occurrences without positions. For the same reason index of this type does not support phrase search and date range search.

Public API changes

Value CompactIndex has been added to GroupDocs.Search.IndexType enum.

Usecases

This example shows how to create compact index:

string indexFolder = @"c:\MyIndex";
string documentsFolder = @"c:\MyDocuments";

// Creating indexing settings object
IndexingSettings indexingSettings = new IndexingSettings();
// Setting compact index type
indexingSettings.IndexType = IndexType.CompactIndex;

// Creating index
Index index = new Index(indexFolder, indexingSettings);

// Indexing
index.AddToIndex(documentsFolder);

// Searching
SearchResults result = index.Search("Einstein");

Implement option for multithreaded indexing

Description

This enhancement allows performing indexing in multiple threads. Multithreaded indexing is faster, but uses more memory and may cause memory overflow error. If you have only 8 GB of RAM installed it is recommended to use not more than 2 threads for indexing. If you have 16 GB of RAM installed you can use 4 threads for indexing. Note that there is a restriction on the use of more than 4 threads.

Public API changes

Method void AddToIndex(string, int) has been added to GroupDocs.Search.Index class.
Method void AddToIndex(string, int, bool) has been added to GroupDocs.Search.Index class.
Method void AddToIndexAsync(string, int) has been added to GroupDocs.Search.Index class.
Method void AddToIndexAsync(string, int, bool) has been added to GroupDocs.Search.Index class.
Method void AddToIndex(string[], int) has been added to GroupDocs.Search.Index class.
Method void AddToIndex(string[], int, bool) has been added to GroupDocs.Search.Index class.
Method void AddToIndexAsync(string[], int) has been added to GroupDocs.Search.Index class.
Method void AddToIndexAsync(string[], int, bool) has been added to GroupDocs.Search.Index class.

Usecases

This example shows how to run multithreaded indexing synchronously:

string indexFolder = @"c:\MyIndex";
string documentsFolder = @"c:\MyDocuments";

// Creating index
Index index = new Index(indexFolder);

// Indexing in 2 threads
index.AddToIndex(documentsFolder, 2);

// Searching
SearchResults result = index.Search("Einstein");

This example shows how to run multithreaded indexing asynchronously:

string indexFolder = @"c:\MyIndex";
string documentsFolder = @"c:\MyDocuments";

// Creating index
Index index = new Index(indexFolder);

// Indexing in 2 threads
index.AddToIndexAsync(documentsFolder, 2);

// User can perform a search after the completion of the indexing operation

Improve index structure to increase indexing speed

Description

This enhancement is implemented to increase indexing performance. As a result, the performance of single-threaded indexing has been improved by about 8%.

Public API changes

None.

Usecases

None.