Examples with KVEntry org.apache.accumulo.tserver.tablet.KVEntry used on opensource projects

Example 1 with KVEntry

use of org.apache.accumulo.tserver.tablet.KVEntry in project accumulo by apache.

the class LookupTask method run.

@Override
public void run() {
    MultiScanSession session = (MultiScanSession) server.getSession(scanID);
    String oldThreadName = Thread.currentThread().getName();
    try {
        if (isCancelled() || session == null)
            return;
        TableConfiguration acuTableConf = server.getTableConfiguration(session.threadPoolExtent);
        long maxResultsSize = acuTableConf.getAsBytes(Property.TABLE_SCAN_MAXMEM);
        runState.set(ScanRunState.RUNNING);
        Thread.currentThread().setName("Client: " + session.client + " User: " + session.getUser() + " Start: " + session.startTime + " Table: ");
        long bytesAdded = 0;
        long maxScanTime = 4000;
        long startTime = System.currentTimeMillis();
        List<KVEntry> results = new ArrayList<>();
        Map<KeyExtent, List<Range>> failures = new HashMap<>();
        List<KeyExtent> fullScans = new ArrayList<>();
        KeyExtent partScan = null;
        Key partNextKey = null;
        boolean partNextKeyInclusive = false;
        Iterator<Entry<KeyExtent, List<Range>>> iter = session.queries.entrySet().iterator();
        // check the time so that the read ahead thread is not monopolized
        while (iter.hasNext() && bytesAdded < maxResultsSize && (System.currentTimeMillis() - startTime) < maxScanTime) {
            Entry<KeyExtent, List<Range>> entry = iter.next();
            iter.remove();
            // check that tablet server is serving requested tablet
            Tablet tablet = server.getOnlineTablet(entry.getKey());
            if (tablet == null) {
                failures.put(entry.getKey(), entry.getValue());
                continue;
            }
            Thread.currentThread().setName("Client: " + session.client + " User: " + session.getUser() + " Start: " + session.startTime + " Tablet: " + entry.getKey().toString());
            LookupResult lookupResult;
            try {
                // canceled
                if (isCancelled())
                    interruptFlag.set(true);
                lookupResult = tablet.lookup(entry.getValue(), session.columnSet, session.auths, results, maxResultsSize - bytesAdded, session.ssiList, session.ssio, interruptFlag, session.samplerConfig, session.batchTimeOut, session.context);
                // if the tablet was closed it it possible that the
                // interrupt flag was set.... do not want it set for
                // the next
                // lookup
                interruptFlag.set(false);
            } catch (IOException e) {
                log.warn("lookup failed for tablet " + entry.getKey(), e);
                throw new RuntimeException(e);
            }
            bytesAdded += lookupResult.bytesAdded;
            if (lookupResult.unfinishedRanges.size() > 0) {
                if (lookupResult.closed) {
                    failures.put(entry.getKey(), lookupResult.unfinishedRanges);
                } else {
                    session.queries.put(entry.getKey(), lookupResult.unfinishedRanges);
                    partScan = entry.getKey();
                    partNextKey = lookupResult.unfinishedRanges.get(0).getStartKey();
                    partNextKeyInclusive = lookupResult.unfinishedRanges.get(0).isStartKeyInclusive();
                }
            } else {
                fullScans.add(entry.getKey());
            }
        }
        long finishTime = System.currentTimeMillis();
        session.totalLookupTime += (finishTime - startTime);
        session.numEntries += results.size();
        // convert everything to thrift before adding result
        List<TKeyValue> retResults = new ArrayList<>();
        for (KVEntry entry : results) retResults.add(new TKeyValue(entry.getKey().toThrift(), ByteBuffer.wrap(entry.getValue().get())));
        Map<TKeyExtent, List<TRange>> retFailures = Translator.translate(failures, Translators.KET, new Translator.ListTranslator<>(Translators.RT));
        List<TKeyExtent> retFullScans = Translator.translate(fullScans, Translators.KET);
        TKeyExtent retPartScan = null;
        TKey retPartNextKey = null;
        if (partScan != null) {
            retPartScan = partScan.toThrift();
            retPartNextKey = partNextKey.toThrift();
        }
        // add results to queue
        addResult(new MultiScanResult(retResults, retFailures, retFullScans, retPartScan, retPartNextKey, partNextKeyInclusive, session.queries.size() != 0));
    } catch (IterationInterruptedException iie) {
        if (!isCancelled()) {
            log.warn("Iteration interrupted, when scan not cancelled", iie);
            addResult(iie);
        }
    } catch (SampleNotPresentException e) {
        addResult(e);
    } catch (Throwable e) {
        log.warn("exception while doing multi-scan ", e);
        addResult(e);
    } finally {
        Thread.currentThread().setName(oldThreadName);
        runState.set(ScanRunState.FINISHED);
    }
}