Examples with LossyCounting org.apache.hadoop.hbase.util.LossyCounting used on opensource projects

Example 1 with LossyCounting

use of org.apache.hadoop.hbase.util.LossyCounting in project hbase by apache.

the class MetaTableMetrics method start.

@Override
public void start(CoprocessorEnvironment env) throws IOException {
    observer = new ExampleRegionObserverMeta();
    if (env instanceof RegionCoprocessorEnvironment && ((RegionCoprocessorEnvironment) env).getRegionInfo().getTable() != null && ((RegionCoprocessorEnvironment) env).getRegionInfo().getTable().equals(TableName.META_TABLE_NAME)) {
        RegionCoprocessorEnvironment regionCoprocessorEnv = (RegionCoprocessorEnvironment) env;
        registry = regionCoprocessorEnv.getMetricRegistryForRegionServer();
        LossyCounting.LossyCountingListener<String> listener = key -> {
            registry.remove(key);
            metrics.remove(key);
        };
        final Configuration conf = regionCoprocessorEnv.getConfiguration();
        clientMetricsLossyCounting = new LossyCounting<>("clientMetaMetrics", conf, listener);
        regionMetricsLossyCounting = new LossyCounting<>("regionMetaMetrics", conf, listener);
        // only be active mode when this region holds meta table.
        active = true;
    }
}