Package org.apache.accumulo.core.client.summary.summarizers

Class AuthorizationSummarizer

java.lang.Object

org.apache.accumulo.core.client.summary.CountingSummarizer<ByteSequence>

org.apache.accumulo.core.client.summary.summarizers.AuthorizationSummarizer

All Implemented Interfaces:

Summarizer

public class AuthorizationSummarizer
extends CountingSummarizer<ByteSequence>

Counts unique authorizations in column visibility labels. Leverages super class to defend against too many. This class is useful for discovering what authorizations are present when the expected number of authorizations is small.

As an example, assume a data set of three keys with the column visibilities : (A&C)|(A&D), A&B, and C|E. For these input this summarizer would output : c:A=2, c:B=1, c:C=2, D:1, E:1. Notice that even though A occurred 3 times in total, its only counted once per column visibility.

See the superclass documentation for more information about usage and configuration.

Since:

2.0.0

See Also:

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

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.accumulo.core.client.summary.CountingSummarizer

CountingSummarizer.Converter<K>

Nested classes/interfaces inherited from interface org.apache.accumulo.core.client.summary.Summarizer

Summarizer.Collector, Summarizer.Combiner, Summarizer.StatisticConsumer

Field Summary

Fields inherited from class org.apache.accumulo.core.client.summary.CountingSummarizer

COUNTER_STAT_PREFIX, DELETES_IGNORED_STAT, EMITTED_STAT, INGNORE_DELETES_DEFAULT, INGNORE_DELETES_OPT, MAX_CKL_DEFAULT, MAX_COUNTER_DEFAULT, MAX_COUNTER_LEN_OPT, MAX_COUNTERS_OPT, SEEN_STAT, TOO_LONG_STAT, TOO_MANY_STAT

Constructor Summary

Constructors

Constructor	Description
AuthorizationSummarizer()

Method Summary

Modifier and Type	Method	Description
protected CountingSummarizer.Converter<ByteSequence>	converter()

Methods inherited from class org.apache.accumulo.core.client.summary.CountingSummarizer

collector, combiner, copier, encoder

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AuthorizationSummarizer

public AuthorizationSummarizer()

Method Details

converter

protected CountingSummarizer.Converter<ByteSequence> converter()

Specified by:

converter in class CountingSummarizer<ByteSequence>

Returns:

A function that is used to convert each key value to zero or more counter objects. Each function returned should be independent.