DeletesSummarizer (Apache Accumulo Core 2.0.0 API)

java.lang.Object
- org.apache.accumulo.core.client.summary.summarizers.DeletesSummarizer

All Implemented Interfaces:

Summarizer
```
public class DeletesSummarizer
extends Object
implements Summarizer
```
This summarizer tracks the total number of delete Keys seen and the total number of keys seen.
This summarizer is used by org.apache.accumulo.tserver.compaction.strategies.TooManyDeletesCompactionStrategy to make compaction decisions based on the number of deletes.

Since:

2.0.0

See Also:

TableOperations.addSummarizers(String, org.apache.accumulo.core.client.summary.SummarizerConfiguration...)

Nested Class Summary
- Nested classes/interfaces inherited from interface org.apache.accumulo.core.client.summary.Summarizer
  Summarizer.Collector, Summarizer.Combiner, Summarizer.StatisticConsumer

Field Summary

Fields
Modifier and Type	Field	Description
`static String`	`DELETES_STAT`	The name of the statistics for the number of deletes.
`static String`	`TOTAL_STAT`	The name of the statistics for the total number of keys.

Constructor Summary

Constructors
Constructor Description

DeletesSummarizer()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Summarizer.Collector`	`collector(SummarizerConfiguration sc)`	Factory method that creates a `Summarizer.Collector` based on configuration.
`Summarizer.Combiner`	`combiner(SummarizerConfiguration sc)`	Factory method that creates a `Summarizer.Combiner`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DELETES_STAT
```
public static final String DELETES_STAT
```
    The name of the statistics for the number of deletes.
    
    See Also:
    
    Constant Field Values
  - TOTAL_STAT
```
public static final String TOTAL_STAT
```
    The name of the statistics for the total number of keys.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - DeletesSummarizer
```
public DeletesSummarizer()
```
- Method Detail
  - collector
```
public Summarizer.Collector collector(SummarizerConfiguration sc)
```
    Description copied from interface: Summarizer
    
    Factory method that creates a Summarizer.Collector based on configuration. Each Summarizer.Collector created by this method should be independent and have its own internal state. Accumulo uses a Collector to generate summary statistics about a sequence of key values written to a file.
    
    Specified by:
    
    collector in interface Summarizer
  - combiner
```
public Summarizer.Combiner combiner(SummarizerConfiguration sc)
```
    Description copied from interface: Summarizer
    
    Factory method that creates a Summarizer.Combiner. Accumulo will only use the created Combiner to merge data from Summarizer.Collectors created using the same SummarizerConfiguration.
    
    Specified by:
    
    combiner in interface Summarizer