/
LogByteSizeMergePolicy.cs
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/
LogByteSizeMergePolicy.cs
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namespace Lucene.Net.Index
{
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/// <summary>
/// This is a <see cref="LogMergePolicy"/> that measures size of a
/// segment as the total byte size of the segment's files.
/// </summary>
public class LogByteSizeMergePolicy : LogMergePolicy
{
/// <summary>Default minimum segment size. </summary>
/// <seealso cref="MinMergeMB"/>
public static readonly double DEFAULT_MIN_MERGE_MB = 1.6;
/// <summary>
/// Default maximum segment size. A segment of this size
/// or larger will never be merged. </summary>
/// <seealso cref="MaxMergeMB"/>
public static readonly double DEFAULT_MAX_MERGE_MB = 2048;
/// <summary>
/// Default maximum segment size. A segment of this size
/// or larger will never be merged during <see cref="IndexWriter.ForceMerge(int)"/>. </summary>
/// <seealso cref="MaxMergeMBForForcedMerge"/>
public static readonly double DEFAULT_MAX_MERGE_MB_FOR_FORCED_MERGE = long.MaxValue;
/// <summary>
/// Sole constructor, setting all settings to their
/// defaults.
/// </summary>
public LogByteSizeMergePolicy()
{
m_minMergeSize = (long)(DEFAULT_MIN_MERGE_MB * 1024 * 1024);
m_maxMergeSize = (long)(DEFAULT_MAX_MERGE_MB * 1024 * 1024);
// .Net port, original line is inappropriate, overflows in .NET
// and the property gets set to a negative value.
// In Java however such statements results in long.MaxValue
//MaxMergeSizeForForcedMerge = (long)(DEFAULT_MAX_MERGE_MB_FOR_FORCED_MERGE * 1024 * 1024);
m_maxMergeSizeForForcedMerge = long.MaxValue;
}
protected override long Size(SegmentCommitInfo info)
{
return SizeBytes(info);
}
/// <summary>
/// <para>Determines the largest segment (measured by total
/// byte size of the segment's files, in MB) that may be
/// merged with other segments. Small values (e.g., less
/// than 50 MB) are best for interactive indexing, as this
/// limits the length of pauses while indexing to a few
/// seconds. Larger values are best for batched indexing
/// and speedier searches.</para>
///
/// <para>Note that <see cref="LogMergePolicy.MaxMergeDocs"/> is also
/// used to check whether a segment is too large for
/// merging (it's either or).</para>
/// </summary>
public virtual double MaxMergeMB
{
get => ((double)m_maxMergeSize) / 1024 / 1024;
set
{
m_maxMergeSize = (long)(value * 1024 * 1024);
if (m_maxMergeSize < 0)
{
m_maxMergeSize = long.MaxValue;
}
}
}
/// <summary>
/// Determines the largest segment (measured by total
/// byte size of the segment's files, in MB) that may be
/// merged with other segments during forceMerge. Setting
/// it low will leave the index with more than 1 segment,
/// even if <see cref="IndexWriter.ForceMerge(int)"/> is called.
/// </summary>
public virtual double MaxMergeMBForForcedMerge
{
get => ((double)m_maxMergeSizeForForcedMerge) / 1024 / 1024;
set
{
m_maxMergeSizeForForcedMerge = (long)(value * 1024 * 1024);
if (m_maxMergeSizeForForcedMerge < 0)
{
m_maxMergeSizeForForcedMerge = long.MaxValue;
}
}
}
/// <summary>
/// Sets the minimum size for the lowest level segments.
/// Any segments below this size are considered to be on
/// the same level (even if they vary drastically in size)
/// and will be merged whenever there are mergeFactor of
/// them. This effectively truncates the "long tail" of
/// small segments that would otherwise be created into a
/// single level. If you set this too large, it could
/// greatly increase the merging cost during indexing (if
/// you flush many small segments).
/// </summary>
public virtual double MinMergeMB
{
get => ((double)m_minMergeSize) / 1024 / 1024;
set
{
m_minMergeSize = (long)(value * 1024 * 1024);
if (m_minMergeSize < 0)
{
m_minMergeSize = long.MaxValue;
}
}
}
}
}