Interface MetricsGatherer<T>
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- Type Parameters:
T
- Type used to return metrics in getMetrics(). This does not impact collection of metrics at all, is only used in that method.
- All Known Implementing Classes:
VisMetricsGatherer
public interface MetricsGatherer<T>
Interface used to gather metrics from RFiles.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description void
addMetric(Key key, Value val)
Collect and store metrics for the given entry.T
getMetrics()
void
init(Map<String,ArrayList<ByteSequence>> cf)
Initialize the gatherer when it is registered with the RFile Readervoid
printMetrics(boolean hash, String metricWord, PrintStream out)
Print the results of the metrics gathering by locality group in the format: Metric name Number of keys Percentage of keys Number of blocks Percentage of blocksvoid
startBlock()
Start a new block within a LocalityGroup.void
startLocalityGroup(org.apache.hadoop.io.Text cf)
Start a new LocalityGroup.
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Method Detail
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init
void init(Map<String,ArrayList<ByteSequence>> cf)
Initialize the gatherer when it is registered with the RFile Reader- Parameters:
cf
- Map of the LocalityGroup names to their column families
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startLocalityGroup
void startLocalityGroup(org.apache.hadoop.io.Text cf)
Start a new LocalityGroup. This method is used when the RFile seeks to the next LocalityGroup.- Parameters:
cf
- Text object of the column family of the first entry in the locality group
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addMetric
void addMetric(Key key, Value val)
Collect and store metrics for the given entry.- Parameters:
key
- Key object of the entry you are collecting metrics fromval
- Value object of the entry you are collecting metrics from
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startBlock
void startBlock()
Start a new block within a LocalityGroup. This method is used when the RFile moves on the the next block in the LocalityGroup.
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printMetrics
void printMetrics(boolean hash, String metricWord, PrintStream out)
Print the results of the metrics gathering by locality group in the format: Metric name Number of keys Percentage of keys Number of blocks Percentage of blocks- Parameters:
hash
- Boolean to determine whether the values being printed should be hashedmetricWord
- String of the name of the metric that was collectedout
- PrintStream of where the information should be written to
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getMetrics
T getMetrics()
- Returns:
- the metrics gathered
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