Ejemplo n.º 1
0
  /**
   * Should only be called by ColumnFamilyStore.apply via Keyspace.apply, which supplies the
   * appropriate OpOrdering.
   *
   * <p>replayPosition should only be null if this is a secondary index, in which case it is
   * *expected* to be null
   */
  long put(PartitionUpdate update, UpdateTransaction indexer, OpOrder.Group opGroup) {
    AtomicBTreePartition previous = partitions.get(update.partitionKey());

    long initialSize = 0;
    if (previous == null) {
      final DecoratedKey cloneKey = allocator.clone(update.partitionKey(), opGroup);
      AtomicBTreePartition empty = new AtomicBTreePartition(cfs.metadata, cloneKey, allocator);
      // We'll add the columns later. This avoids wasting works if we get beaten in the putIfAbsent
      previous = partitions.putIfAbsent(cloneKey, empty);
      if (previous == null) {
        previous = empty;
        // allocate the row overhead after the fact; this saves over allocating and having to free
        // after, but
        // means we can overshoot our declared limit.
        int overhead = (int) (cloneKey.getToken().getHeapSize() + ROW_OVERHEAD_HEAP_SIZE);
        allocator.onHeap().allocate(overhead, opGroup);
        initialSize = 8;
      } else {
        allocator.reclaimer().reclaimImmediately(cloneKey);
      }
    }

    long[] pair = previous.addAllWithSizeDelta(update, opGroup, indexer);
    minTimestamp = Math.min(minTimestamp, previous.stats().minTimestamp);
    liveDataSize.addAndGet(initialSize + pair[0]);
    columnsCollector.update(update.columns());
    statsCollector.update(update.stats());
    currentOperations.addAndGet(update.operationCount());
    return pair[1];
  }
Ejemplo n.º 2
0
  private Collection<SSTableReader> writeSortedContents(File sstableDirectory) {
    boolean isBatchLogTable =
        cfs.name.equals(SystemKeyspace.BATCHES)
            && cfs.keyspace.getName().equals(SystemKeyspace.NAME);

    logger.debug("Writing {}", Memtable.this.toString());

    Collection<SSTableReader> ssTables;
    try (SSTableTxnWriter writer =
        createFlushWriter(
            cfs.getSSTablePath(sstableDirectory), columnsCollector.get(), statsCollector.get())) {
      boolean trackContention = logger.isTraceEnabled();
      int heavilyContendedRowCount = 0;
      // (we can't clear out the map as-we-go to free up memory,
      //  since the memtable is being used for queries in the "pending flush" category)
      for (AtomicBTreePartition partition : partitions.values()) {
        // Each batchlog partition is a separate entry in the log. And for an entry, we only do 2
        // operations: 1) we insert the entry and 2) we delete it. Further, BL data is strictly
        // local,
        // we don't need to preserve tombstones for repair. So if both operation are in this
        // memtable (which will almost always be the case if there is no ongoing failure), we can
        // just skip the entry (CASSANDRA-4667).
        if (isBatchLogTable && !partition.partitionLevelDeletion().isLive() && partition.hasRows())
          continue;

        if (trackContention && partition.usePessimisticLocking()) heavilyContendedRowCount++;

        if (!partition.isEmpty()) {
          try (UnfilteredRowIterator iter = partition.unfilteredIterator()) {
            writer.append(iter);
          }
        }
      }

      if (writer.getFilePointer() > 0) {
        logger.debug(
            String.format(
                "Completed flushing %s (%s) for commitlog position %s",
                writer.getFilename(),
                FBUtilities.prettyPrintMemory(writer.getFilePointer()),
                commitLogUpperBound));

        // sstables should contain non-repaired data.
        ssTables = writer.finish(true);
      } else {
        logger.debug(
            "Completed flushing {}; nothing needed to be retained.  Commitlog position was {}",
            writer.getFilename(),
            commitLogUpperBound);
        writer.abort();
        ssTables = Collections.emptyList();
      }

      if (heavilyContendedRowCount > 0)
        logger.trace(
            String.format(
                "High update contention in %d/%d partitions of %s ",
                heavilyContendedRowCount, partitions.size(), Memtable.this.toString()));

      return ssTables;
    }
  }