org.apache.hadoop.hbase.client.ClientSimpleScanner Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.hadoop.hbase.client;
import static org.apache.hadoop.hbase.client.ConnectionUtils.createClosestRowAfter;
import static org.apache.hadoop.hbase.client.ConnectionUtils.isEmptyStartRow;
import static org.apache.hadoop.hbase.client.ConnectionUtils.noMoreResultsForScan;
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.ipc.RpcControllerFactory;
import org.apache.yetus.audience.InterfaceAudience;
/**
* ClientSimpleScanner implements a sync scanner behaviour. The cache is a simple list. The prefetch
* is invoked only when the application finished processing the entire cache.
*/
@InterfaceAudience.Private
public class ClientSimpleScanner extends ClientScanner {
public ClientSimpleScanner(Configuration configuration, Scan scan, TableName name,
ClusterConnection connection, RpcRetryingCallerFactory rpcCallerFactory,
RpcControllerFactory rpcControllerFactory, ExecutorService pool, int scanReadRpcTimeout,
int scannerTimeout, int replicaCallTimeoutMicroSecondScan) throws IOException {
super(configuration, scan, name, connection, rpcCallerFactory, rpcControllerFactory, pool,
scanReadRpcTimeout, scannerTimeout, replicaCallTimeoutMicroSecondScan);
}
@Override
protected boolean setNewStartKey() {
if (noMoreResultsForScan(scan, currentRegion)) {
return false;
}
scan.withStartRow(currentRegion.getEndKey(), true);
return true;
}
@Override
protected ScannerCallable createScannerCallable() {
if (!scan.includeStartRow() && !isEmptyStartRow(scan.getStartRow())) {
// we have not implemented locate to next row for sync client yet, so here we change the
// inclusive of start row to true.
scan.withStartRow(createClosestRowAfter(scan.getStartRow()), true);
}
return new ScannerCallable(getConnection(), getTable(), scan, this.scanMetrics,
this.rpcControllerFactory, getScanReplicaId());
}
}