Package com.datastax.driver.core.schemabuilder

Class TableOptions.CompactionOptions.SizeTieredCompactionStrategyOptions

    • Method Detail

      • bucketHigh

        public TableOptions.CompactionOptions.SizeTieredCompactionStrategyOptions bucketHigh​(Double bucketHigh)
        Size-tiered compaction strategy (STCS) considers SSTables to be within the same bucket if the SSTable size diverges by 50% or less from the default bucket_low and default bucket_high values: [average-size × bucket_low, average-size × bucket_high].

        If no call is made to this method, the default value set by Cassandra is 1.5.

        Parameters:
        bucketHigh - the new value.
        Returns:
        this object (for call chaining).

      • bucketLow

        public TableOptions.CompactionOptions.SizeTieredCompactionStrategyOptions bucketLow​(Double bucketLow)
        Size-tiered compaction strategy (STCS) considers SSTables to be within the same bucket if the SSTable size diverges by 50% or less from the default bucket_low and default bucket_high values: [average-size × bucket_low, average-size × bucket_high].

        If no call is made to this method, the default value set by Cassandra is 0.5.

        Parameters:
        bucketLow - the new value.
        Returns:
        this object (for call chaining).

      • coldReadsRatioToOmit

        public TableOptions.CompactionOptions.SizeTieredCompactionStrategyOptions coldReadsRatioToOmit​(Double coldReadsRatio)
        The maximum percentage of reads/sec that ignored SSTables may account for. The recommended range of values is 0.0 and 1.0. In Cassandra 2.0.3 and later, you can enable the cold_reads_to_omit property to tune performace per table. The Optimizations around Cold SSTables blog includes detailed information tuning performance using this property, which avoids compacting cold SSTables. Use the ALTER TABLE command to configure cold_reads_to_omit.

        If no call is made to this method, the default value set by Cassandra is 0.0 (disabled).

        Parameters:
        coldReadsRatio - the new value.
        Returns:
        this object (for call chaining).

      • maxThreshold

        public TableOptions.CompactionOptions.SizeTieredCompactionStrategyOptions maxThreshold​(Integer maxThreshold)
        Sets the maximum number of SSTables to allow in a minor compaction. In LeveledCompactionStrategy (LCS), it applies to L0 when L0 gets behind, that is, when L0 accumulates more than MAX_COMPACTING_L0 SSTables.

        If no call is made to this method, the default value set by Cassandra is 32.

        Parameters:
        maxThreshold - the new value.
        Returns:
        this object (for call chaining).

      • minSSTableSizeInBytes

        public TableOptions.CompactionOptions.SizeTieredCompactionStrategyOptions minSSTableSizeInBytes​(Long minSSTableSize)
        The SizeTieredCompactionStrategy groups SSTables for compaction into buckets. The bucketing process groups SSTables that differ in size by less than 50%. This results in a bucketing process that is too fine grained for small SSTables. If your SSTables are small, use min_sstable_size to define a size threshold (in bytes) below which all SSTables belong to one unique bucket

        If no call is made to this method, the default value set by Cassandra is 52428800 (50 MB).

        Parameters:
        minSSTableSize - the new value.
        Returns:
        this object (for call chaining).