Example usage for org.apache.cassandra.io.sstable.format SSTableReader getMaxTimestamp

Introduction

In this page you can find the example usage for org.apache.cassandra.io.sstable.format SSTableReader getMaxTimestamp.

Prototype

public long getMaxTimestamp() 

Source Link

Usage

From source file:com.jeffjirsa.cassandra.db.compaction.TimeWindowCompactionStrategy.java

License:Apache License

/**
 * Group files with similar max timestamp into buckets.
 *
 * @param files pairs consisting of a file and its min timestamp
 * @param sstableWindowUnit//  w ww  .jav a 2 s.  c om
 * @param sstableWindowSize
 * @param timestampResolution
 * @return A pair, where the left element is the bucket representation (map of timestamp to sstablereader), and the right is the highest timestamp seen
 */
@VisibleForTesting
static Pair<HashMultimap<Long, SSTableReader>, Long> getBuckets(Iterable<SSTableReader> files,
        TimeUnit sstableWindowUnit, int sstableWindowSize, TimeUnit timestampResolution) {
    HashMultimap<Long, SSTableReader> buckets = HashMultimap.create();

    long maxTimestamp = 0;
    // Create hash map to represent buckets
    // For each sstable, add sstable to the time bucket
    // Where the bucket is the file's max timestamp rounded to the nearest window bucket
    for (SSTableReader f : files) {
        long tStamp = f.getMaxTimestamp();
        if (timestampResolution.equals(TimeUnit.MICROSECONDS))
            tStamp = tStamp / 1000L;
        else if (timestampResolution.equals(TimeUnit.NANOSECONDS))
            tStamp = tStamp / 1000000L;
        else if (timestampResolution.equals(TimeUnit.SECONDS))
            tStamp = tStamp * 1000L;
        else
            assert TimeWindowCompactionStrategyOptions.validTimestampTimeUnits.contains(timestampResolution);

        Pair<Long, Long> bounds = getWindowBoundsInMillis(sstableWindowUnit, sstableWindowSize, tStamp);
        buckets.put(bounds.left, f);
        if (bounds.left > maxTimestamp)
            maxTimestamp = bounds.left;
    }

    logger.debug("buckets {}, max timestamp", buckets, maxTimestamp);
    return Pair.<HashMultimap<Long, SSTableReader>, Long>create(buckets, maxTimestamp);
}

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