Package org.apache.cassandra.utils

Examples of org.apache.cassandra.utils.EstimatedHistogram

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    private void printCfHistograms(String keySpace, String columnFamily, PrintStream output)
    {
        ColumnFamilyStoreMBean store = this.probe.getCfsProxy(keySpace, columnFamily);

        // default is 90 offsets
        long[] offsets = new EstimatedHistogram().getBucketOffsets();

        long[] rrlh = store.getRecentReadLatencyHistogramMicros();
        long[] rwlh = store.getRecentWriteLatencyHistogramMicros();
        long[] sprh = store.getRecentSSTablesPerReadHistogram();
        long[] ersh = store.getEstimatedRowSizeHistogram();
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    private void printCfHistograms(String keySpace, String columnFamily, PrintStream output)
    {
        ColumnFamilyStoreMBean store = this.probe.getCfsProxy(keySpace, columnFamily);

        // default is 90 offsets
        long[] offsets = new EstimatedHistogram().getBucketOffsets();

        long[] rrlh = store.getRecentReadLatencyHistogramMicros();
        long[] rwlh = store.getRecentWriteLatencyHistogramMicros();
        long[] sprh = store.getRecentSSTablesPerReadHistogram();
        long[] ersh = store.getEstimatedRowSizeHistogram();
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    }

    private void printProxyHistograms(PrintStream output)
    {
        StorageProxyMBean sp = this.probe.getSpProxy();
        long[] offsets = new EstimatedHistogram().getBucketOffsets();
        long[] rrlh = sp.getRecentReadLatencyHistogramMicros();
        long[] rwlh = sp.getRecentWriteLatencyHistogramMicros();
        long[] rrnglh = sp.getRecentRangeLatencyHistogramMicros();

        output.println("proxy histograms");
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    private void printCfHistograms(String keySpace, String columnFamily, PrintStream output)
    {
        ColumnFamilyStoreMBean store = this.probe.getCfsProxy(keySpace, columnFamily);

        // default is 90 offsets
        long[] offsets = new EstimatedHistogram().getBucketOffsets();

        long[] rrlh = store.getRecentReadLatencyHistogramMicros();
        long[] rwlh = store.getRecentWriteLatencyHistogramMicros();
        long[] sprh = store.getRecentSSTablesPerReadHistogram();
        long[] ersh = store.getEstimatedRowSizeHistogram();
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    }

    private void printProxyHistograms(PrintStream output)
    {
        StorageProxyMBean sp = this.probe.getSpProxy();
        long[] offsets = new EstimatedHistogram().getBucketOffsets();
        long[] rrlh = sp.getRecentReadLatencyHistogramMicros();
        long[] rwlh = sp.getRecentWriteLatencyHistogramMicros();
        long[] rrnglh = sp.getRecentRangeLatencyHistogramMicros();

        output.println("proxy histograms");
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    private void printCfHistograms(String keySpace, String columnFamily, PrintStream output)
    {
        ColumnFamilyStoreMBean store = this.probe.getCfsProxy(keySpace, columnFamily);

        // default is 90 offsets
        long[] offsets = new EstimatedHistogram().getBucketOffsets();

        long[] rrlh = store.getRecentReadLatencyHistogramMicros();
        long[] rwlh = store.getRecentWriteLatencyHistogramMicros();
        long[] sprh = store.getRecentSSTablesPerReadHistogram();
        long[] ersh = store.getEstimatedRowSizeHistogram();
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public class SSTableMetadataSerializerTest
{
    @Test
    public void testSerialization() throws IOException
    {
        EstimatedHistogram rowSizes = new EstimatedHistogram(
            new long[] { 1L, 2L },
            new long[] { 3L, 4L, 5L });
        EstimatedHistogram columnCounts = new EstimatedHistogram(
            new long[] { 6L, 7L },
            new long[] { 8L, 9L, 10L });
        ReplayPosition rp = new ReplayPosition(11L, 12);
        long maxTimestamp = 4162517136L;
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            out.writeBoolean(component.hasLegacyCounterShards);
        }

        public StatsMetadata deserialize(Descriptor.Version version, DataInput in) throws IOException
        {
            EstimatedHistogram rowSizes = EstimatedHistogram.serializer.deserialize(in);
            EstimatedHistogram columnCounts = EstimatedHistogram.serializer.deserialize(in);
            ReplayPosition replayPosition = ReplayPosition.serializer.deserialize(in);
            long minTimestamp = in.readLong();
            long maxTimestamp = in.readLong();
            int maxLocalDeletionTime = in.readInt();
            double compressionRatio = in.readDouble();
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            // calculate percentile of row size and column count
            long[] estimatedRowSize = (long[]) probe.getColumnFamilyMetric(keyspace, cfname, "EstimatedRowSizeHistogram");
            long[] estimatedColumnCount = (long[]) probe.getColumnFamilyMetric(keyspace, cfname, "EstimatedColumnCountHistogram");

            long[] bucketOffsets = new EstimatedHistogram().getBucketOffsets();
            EstimatedHistogram rowSizeHist = new EstimatedHistogram(bucketOffsets, estimatedRowSize);
            EstimatedHistogram columnCountHist = new EstimatedHistogram(bucketOffsets, estimatedColumnCount);

            // build arrays to store percentile values
            double[] estimatedRowSizePercentiles = new double[7];
            double[] estimatedColumnCountPercentiles = new double[7];
            double[] offsetPercentiles = new double[]{0.5, 0.75, 0.95, 0.98, 0.99};
            for (int i = 0; i < offsetPercentiles.length; i++)
            {
                estimatedRowSizePercentiles[i] = rowSizeHist.percentile(offsetPercentiles[i]);
                estimatedColumnCountPercentiles[i] = columnCountHist.percentile(offsetPercentiles[i]);
            }

            // min value
            estimatedRowSizePercentiles[5] = rowSizeHist.min();
            estimatedColumnCountPercentiles[5] = columnCountHist.min();
            // max value
            estimatedRowSizePercentiles[6] = rowSizeHist.max();
            estimatedColumnCountPercentiles[6] = columnCountHist.max();

            String[] percentiles = new String[]{"50%", "75%", "95%", "98%", "99%", "Min", "Max"};
            double[] readLatency = probe.metricPercentilesAsArray((JmxReporter.HistogramMBean) probe.getColumnFamilyMetric(keyspace, cfname, "ReadLatency"));
            double[] writeLatency = probe.metricPercentilesAsArray((JmxReporter.TimerMBean) probe.getColumnFamilyMetric(keyspace, cfname, "WriteLatency"));
            double[] sstablesPerRead = probe.metricPercentilesAsArray((JmxReporter.HistogramMBean) probe.getColumnFamilyMetric(keyspace, cfname, "SSTablesPerReadHistogram"));
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    }

    static EstimatedHistogram defaultColumnCountHistogram()
    {
        // EH of 114 can track a max value of 2395318855, i.e., > 2B columns
        return new EstimatedHistogram(114);
    }
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Related Classes of org.apache.cassandra.utils.EstimatedHistogram

  • com.netflix.priam.resources.CassandraAdmin
  • org.apache.cassandra.io.sstable.metadata.LegacyMetadataSerializer
  • org.apache.cassandra.io.sstable.metadata.MetadataCollector
  • org.apache.cassandra.io.sstable.metadata.MetadataSerializerTest
  • org.apache.cassandra.io.sstable.metadata.StatsMetadata$StatsMetadataSerializer
  • org.apache.cassandra.io.sstable.SSTable
  • org.apache.cassandra.io.sstable.SSTableMetadata
  • org.apache.cassandra.io.sstable.SSTableMetadata$SSTableMetadataSerializer
  • org.apache.cassandra.io.sstable.SSTableMetadataSerializerTest
  • org.apache.cassandra.io.sstable.SSTableReader
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