Examples with StatsIterator org.apache.accumulo.core.iterators.system.StatsIterator used on opensource projects

Example 1 with StatsIterator

use of org.apache.accumulo.core.iterators.system.StatsIterator in project accumulo by apache.

the class ScanDataSource method createIterator.

private SortedKeyValueIterator<Key, Value> createIterator() throws IOException {
    Map<FileRef, DataFileValue> files;
    SamplerConfigurationImpl samplerConfig = options.getSamplerConfigurationImpl();
    synchronized (tablet) {
        if (memIters != null)
            throw new IllegalStateException("Tried to create new scan iterator w/o releasing memory");
        if (tablet.isClosed())
            throw new TabletClosedException();
        if (interruptFlag.get())
            throw new IterationInterruptedException(tablet.getExtent().toString() + " " + interruptFlag.hashCode());
        // only acquire the file manager when we know the tablet is open
        if (fileManager == null) {
            fileManager = tablet.getTabletResources().newScanFileManager();
            tablet.addActiveScans(this);
        }
        if (fileManager.getNumOpenFiles() != 0)
            throw new IllegalStateException("Tried to create new scan iterator w/o releasing files");
        // set this before trying to get iterators in case
        // getIterators() throws an exception
        expectedDeletionCount = tablet.getDataSourceDeletions();
        memIters = tablet.getTabletMemory().getIterators(samplerConfig);
        Pair<Long, Map<FileRef, DataFileValue>> reservation = tablet.getDatafileManager().reserveFilesForScan();
        fileReservationId = reservation.getFirst();
        files = reservation.getSecond();
    }
    Collection<InterruptibleIterator> mapfiles = fileManager.openFiles(files, options.isIsolated(), samplerConfig);
    for (SortedKeyValueIterator<Key, Value> skvi : Iterables.concat(mapfiles, memIters)) ((InterruptibleIterator) skvi).setInterruptFlag(interruptFlag);
    List<SortedKeyValueIterator<Key, Value>> iters = new ArrayList<>(mapfiles.size() + memIters.size());
    iters.addAll(mapfiles);
    iters.addAll(memIters);
    MultiIterator multiIter = new MultiIterator(iters, tablet.getExtent());
    TabletIteratorEnvironment iterEnv = new TabletIteratorEnvironment(IteratorScope.scan, tablet.getTableConfiguration(), fileManager, files, options.getAuthorizations(), samplerConfig);
    statsIterator = new StatsIterator(multiIter, TabletServer.seekCount, tablet.getScannedCounter());
    SortedKeyValueIterator<Key, Value> visFilter = IteratorUtil.setupSystemScanIterators(statsIterator, options.getColumnSet(), options.getAuthorizations(), options.getDefaultLabels());
    if (!loadIters) {
        return visFilter;
    } else {
        List<IterInfo> iterInfos;
        Map<String, Map<String, String>> iterOpts;
        ParsedIteratorConfig pic = tablet.getTableConfiguration().getParsedIteratorConfig(IteratorScope.scan);
        if (options.getSsiList().size() == 0 && options.getSsio().size() == 0) {
            // No scan time iterator options were set, so can just use the pre-parsed table iterator options.
            iterInfos = pic.getIterInfo();
            iterOpts = pic.getOpts();
        } else {
            // Scan time iterator options were set, so need to merge those with pre-parsed table iterator options.
            iterOpts = new HashMap<>(pic.getOpts().size() + options.getSsio().size());
            iterInfos = new ArrayList<>(pic.getIterInfo().size() + options.getSsiList().size());
            IteratorUtil.mergeIteratorConfig(iterInfos, iterOpts, pic.getIterInfo(), pic.getOpts(), options.getSsiList(), options.getSsio());
        }
        String context;
        if (options.getClassLoaderContext() != null) {
            log.trace("Loading iterators for scan with scan context: {}", options.getClassLoaderContext());
            context = options.getClassLoaderContext();
        } else {
            context = pic.getContext();
            if (context != null) {
                log.trace("Loading iterators for scan with table context: {}", options.getClassLoaderContext());
            } else {
                log.trace("Loading iterators for scan");
            }
        }
        return iterEnv.getTopLevelIterator(IteratorUtil.loadIterators(visFilter, iterInfos, iterOpts, iterEnv, true, context));
    }
}