Examples of org.apache.hadoop.hbase.UnknownScannerException

org.apache.hadoop.hbase.UnknownScannerException
Thrown if a region server is passed an unknown scanner id. Usually means the client has take too long between checkins and so the scanner lease on the serverside has expired OR the serverside is closing down and has cancelled all leases.

  }


  public Result[] next(final long scannerId, int nbRows) throws IOException {
    String scannerName = String.valueOf(scannerId);
    RegionScanner s = this.scanners.get(scannerName);
    if (s == null) throw new UnknownScannerException("Name: " + scannerName);
    try {
      checkOpen();
    } catch (IOException e) {
      // If checkOpen failed, server not running or filesystem gone,
      // cancel this lease; filesystem is gone or we're closing or something.

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    @Override
    public synchronized boolean next(List<KeyValue> outResults, int limit,
        String metric) throws IOException {
      if (this.filterClosed) {
        throw new UnknownScannerException("Scanner was closed (timed out?) " +
            "after we renewed it. Could be caused by a very slow scanner " +
            "or a lengthy garbage collection");
      }
      startRegionOperation();
      readRequestsCount.increment();

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    @Override
    public synchronized boolean next(List<KeyValue> outResults, int limit,
        String metric) throws IOException {
      if (this.filterClosed) {
        throw new UnknownScannerException("Scanner was closed (timed out?) " +
            "after we renewed it. Could be caused by a very slow scanner " +
            "or a lengthy garbage collection");
      }
      startRegionOperation();
      readRequestsCount.increment();

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  }


  public Result[] next(final long scannerId, int nbRows) throws IOException {
    String scannerName = String.valueOf(scannerId);
    RegionScanner s = this.scanners.get(scannerName);
    if (s == null) throw new UnknownScannerException("Name: " + scannerName);
    try {
      checkOpen();
    } catch (IOException e) {
      // If checkOpen failed, server not running or filesystem gone,
      // cancel this lease; filesystem is gone or we're closing or something.

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    @Override
    public synchronized boolean next(List<KeyValue> outResults, int limit,
        String metric) throws IOException {
      if (this.filterClosed) {
        throw new UnknownScannerException("Scanner was closed (timed out?) " +
            "after we renewed it. Could be caused by a very slow scanner " +
            "or a lengthy garbage collection");
      }
      startRegionOperation();
      readRequestsCount.increment();

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    }


    @Override
    public synchronized boolean next(List<Cell> outResults, int limit) throws IOException {
      if (this.filterClosed) {
        throw new UnknownScannerException("Scanner was closed (timed out?) " +
            "after we renewed it. Could be caused by a very slow scanner " +
            "or a lengthy garbage collection");
      }
      startRegionOperation(Operation.SCAN);
      readRequestsCount.increment();

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        }
        if (request.hasScannerId()) {
          rsh = scanners.get(scannerName);
          if (rsh == null) {
            LOG.info("Client tried to access missing scanner " + scannerName);
            throw new UnknownScannerException(
              "Name: " + scannerName + ", already closed?");
          }
          scanner = rsh.s;
          region = getRegion(scanner.getRegionInfo().getRegionName());
        } else {

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    @Override
    public synchronized boolean next(List<KeyValue> outResults, int limit,
        String metric) throws IOException {
      if (this.filterClosed) {
        throw new UnknownScannerException("Scanner was closed (timed out?) " +
            "after we renewed it. Could be caused by a very slow scanner " +
            "or a lengthy garbage collection");
      }
      startRegionOperation();
      readRequestsCount.increment();

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  public Result[] next(final long scannerId, int nbRows) throws IOException {
    String scannerName = String.valueOf(scannerId);
    RegionScanner s = this.scanners.get(scannerName);
    if (s == null) {
      LOG.info("Client tried to access missing scanner " + scannerName);
      throw new UnknownScannerException("Name: " + scannerName);
    }
    return internalNext(s, nbRows, scannerName);
  }

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          lease = this.leases.removeLease(scannerName);
        }
      } catch (LeaseException le) {
        // What it really means is that there's no such scanner.
        LOG.info("Client tried to access missing scanner " + scannerName + " (no lease)");
        throw new UnknownScannerException("No lease for " + scannerName + ": " + le.getMessage());
      }
      List<Result> results = new ArrayList<Result>(nbRows);
      long currentScanResultSize = 0;
      List<KeyValue> values = new ArrayList<KeyValue>();

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org.apache.hadoop.hbase.mapred.TestTableInputFormat

org.apache.hadoop.hbase.regionserver.HRegion$RegionScanner

org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl

org.apache.hadoop.hbase.regionserver.HRegionServer

org.apache.hadoop.hbase.regionserver.RSRpcServices

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