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 {
    try {
      String scannerName = String.valueOf(scannerId);
      InternalScanner 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,

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    ArrayList<RowResult> resultSets = new ArrayList<RowResult>();
    try {
      String scannerName = String.valueOf(scannerId);
      InternalScanner s = scanners.get(scannerName);
      if (s == null) {
        throw new UnknownScannerException("Name: " + scannerName);
      }
      this.leases.renewLease(scannerName);
      for(int i = 0; i < nbRows; i++) {
        requestCount.incrementAndGet();
        // Collect values to be returned here

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      InternalScanner s = null;
      synchronized(scanners) {
        s = scanners.remove(scannerName);
      }
      if(s == null) {
        throw new UnknownScannerException(scannerName);
      }
      s.close();
      this.leases.cancelLease(scannerName);
    } catch (Throwable t) {
      throw convertThrowableToIOE(cleanup(t));

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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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    requestCount.incrementAndGet();
    try {
      String scannerName = String.valueOf(scannerId);
      InternalScanner s = scanners.get(scannerName);
      if (s == null) {
        throw new UnknownScannerException("Name: " + scannerName);
      }
      this.leases.renewLease(scannerName);


      // Collect values to be returned here
      HbaseMapWritable<byte [], Cell> values

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      InternalScanner s = null;
      synchronized(scanners) {
        s = scanners.remove(scannerName);
      }
      if(s == null) {
        throw new UnknownScannerException(scannerName);
      }
      s.close();
      this.leases.cancelLease(scannerName);
    } catch (IOException e) {
      checkFileSystem();

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    @Override
  public synchronized boolean next(List<KeyValue> 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();
      readRequestsCount.increment();

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  public Result [] next(final long scannerId, int nbRows) throws IOException {
    try {
      String scannerName = String.valueOf(scannerId);
      InternalScanner 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,

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    @Override
    public synchronized boolean next(List<KeyValue> 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();
      try {

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  }


  public Result[] next(final long scannerId, int nbRows) throws IOException {
    String scannerName = String.valueOf(scannerId);
    InternalScanner 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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Related Classes of org.apache.hadoop.hbase.UnknownScannerException

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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