org.apache.accumulo.core.client.mapreduce
Class AccumuloRowInputFormat

java.lang.Object
  org.apache.hadoop.mapreduce.InputFormat<K,V>
      org.apache.accumulo.core.client.mapreduce.AbstractInputFormat<K,V>
          org.apache.accumulo.core.client.mapreduce.InputFormatBase<org.apache.hadoop.io.Text,PeekingIterator<Map.Entry<Key,Value>>>
              org.apache.accumulo.core.client.mapreduce.AccumuloRowInputFormat

public class AccumuloRowInputFormat
extends InputFormatBase<org.apache.hadoop.io.Text,PeekingIterator<Map.Entry<Key,Value>>>

This class allows MapReduce jobs to use Accumulo as the source of data. This InputFormat provides row names as Text as keys, and a corresponding PeekingIterator as a value, which in turn makes the Key/Value pairs for that row available to the Map function. The user must specify the following via static configurator methods:

• AbstractInputFormat.setConnectorInfo(Job, String, AuthenticationToken)
• InputFormatBase.setInputTableName(Job, String)
• AbstractInputFormat.setScanAuthorizations(Job, Authorizations)
• AbstractInputFormat.setZooKeeperInstance(Job, ClientConfiguration) OR AbstractInputFormat.setMockInstance(Job, String)

Other static methods are optional.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.accumulo.core.client.mapreduce.InputFormatBase

InputFormatBase.RangeInputSplit, InputFormatBase.RecordReaderBase<K,V>

Nested classes/interfaces inherited from class org.apache.accumulo.core.client.mapreduce.AbstractInputFormat

AbstractInputFormat.AbstractRecordReader<K,V>

Field Summary

Fields inherited from class org.apache.accumulo.core.client.mapreduce.AbstractInputFormat

CLASS, log

Constructor Summary

AccumuloRowInputFormat()

Method Summary

org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.Text,PeekingIterator<Map.Entry<Key,Value>>>

createRecordReader(org.apache.hadoop.mapreduce.InputSplit split, org.apache.hadoop.mapreduce.TaskAttemptContext context)

Methods inherited from class org.apache.accumulo.core.client.mapreduce.InputFormatBase

addIterator, fetchColumns, getAutoAdjustRanges, getFetchedColumns, getInputTableName, getIterators, getRanges, getTabletLocator, isIsolated, isOfflineScan, setAutoAdjustRanges, setInputTableName, setLocalIterators, setOfflineTableScan, setRanges, setScanIsolation, usesLocalIterators

Methods inherited from class org.apache.accumulo.core.client.mapreduce.AbstractInputFormat

getAuthenticationToken, getInputTableConfig, getInputTableConfigs, getInstance, getLogLevel, getPrincipal, getScanAuthorizations, getSplits, getTabletLocator, getToken, getTokenClass, isConnectorInfoSet, setConnectorInfo, setConnectorInfo, setLogLevel, setMockInstance, setScanAuthorizations, setZooKeeperInstance, setZooKeeperInstance, validateOptions

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AccumuloRowInputFormat

public AccumuloRowInputFormat()

Method Detail

createRecordReader

public org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.Text,PeekingIterator<Map.Entry<Key,Value>>> createRecordReader(org.apache.hadoop.mapreduce.InputSplit split,
                                                                                                                                    org.apache.hadoop.mapreduce.TaskAttemptContext context)
                                                                                                                             throws IOException,
                                                                                                                                    InterruptedException

Specified by:

createRecordReader in class org.apache.hadoop.mapreduce.InputFormat<org.apache.hadoop.io.Text,PeekingIterator<Map.Entry<Key,Value>>>

Throws:

IOException

InterruptedException