Package org.apache.accumulo.hadoopImpl.mapreduce

Class InputFormatBuilderImpl<T>

java.lang.Object

org.apache.accumulo.hadoopImpl.mapreduce.InputFormatBuilderImpl<T>

All Implemented Interfaces:

InputFormatBuilder, InputFormatBuilder.ClientParams<T>, InputFormatBuilder.InputFormatOptions<T>, InputFormatBuilder.TableParams<T>

public class InputFormatBuilderImpl<T>
extends Object
implements InputFormatBuilder, InputFormatBuilder.ClientParams<T>, InputFormatBuilder.TableParams<T>, InputFormatBuilder.InputFormatOptions<T>

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.accumulo.hadoop.mapreduce.InputFormatBuilder

InputFormatBuilder.ClientParams<T>, InputFormatBuilder.InputFormatOptions<T>, InputFormatBuilder.TableParams<T>

Constructor Summary

Constructors

Constructor	Description
InputFormatBuilderImpl(Class<?> callingClass)

Method Summary

Modifier and Type	Method	Description
InputFormatBuilder.InputFormatOptions<T>	addIterator(IteratorSetting cfg)	Encode an iterator on the single input table for this job.
InputFormatBuilder.InputFormatOptions<T>	auths(Authorizations auths)	Sets the Authorizations used to scan.
InputFormatBuilder.InputFormatOptions<T>	autoAdjustRanges(boolean value)	Disables the automatic adjustment of ranges for this job.
InputFormatBuilder.InputFormatOptions<T>	batchScan(boolean value)	Enables the use of the BatchScanner in this job.
InputFormatBuilder.InputFormatOptions<T>	classLoaderContext(String context)	Sets the name of the classloader context on this scanner
InputFormatBuilder.TableParams<T>	clientProperties(Properties clientProperties)	Set client properties needed to communicate with Accumulo for this job.
InputFormatBuilder.TableParams<T>	clientPropertiesPath(String clientPropsPath)	Set path to DFS location containing accumulo-client.properties file.
InputFormatBuilder.InputFormatOptions<T>	consistencyLevel(ScannerBase.ConsistencyLevel level)	Enables the user to set the consistency level
InputFormatBuilder.InputFormatOptions<T>	executionHints(Map<String,String> hints)	Set these execution hints on scanners created for input splits.
InputFormatBuilder.InputFormatOptions<T>	fetchColumns(Collection<IteratorSetting.Column> fetchColumns)	Restricts the columns that will be mapped over for this job for the default input table.
InputFormatBuilder.InputFormatOptions<T>	localIterators(boolean value)	Enables the use of the ClientSideIteratorScanner in this job.
InputFormatBuilder.InputFormatOptions<T>	offlineScan(boolean value)	Enable reading offline tables.
InputFormatBuilder.InputFormatOptions<T>	ranges(Collection<Range> ranges)	Sets the input ranges to scan for the single input table associated with this job.
InputFormatBuilder.InputFormatOptions<T>	samplerConfiguration(SamplerConfiguration samplerConfig)	Causes input format to read sample data.
InputFormatBuilder.InputFormatOptions<T>	scanIsolation(boolean value)	Enables the use of the IsolatedScanner in this job.
void	store(T j)	Finish configuring, verify and serialize options into the JobConf or Job
InputFormatBuilder.InputFormatOptions<T>	table(String tableName)	Sets the name of the input table, over which this job will scan.

Methods inherited from class java.lang.Object

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

Constructor Details

InputFormatBuilderImpl

public InputFormatBuilderImpl(Class<?> callingClass)

Method Details

clientProperties

public InputFormatBuilder.TableParams<T> clientProperties(Properties clientProperties)

Description copied from interface: InputFormatBuilder.ClientParams

Set client properties needed to communicate with Accumulo for this job. This information will be serialized into the configuration. Therefore, it is more secure to use InputFormatBuilder.ClientParams.clientPropertiesPath(String). Client properties can be created using Accumulo.newClientProperties()

Specified by:

clientProperties in interface InputFormatBuilder.ClientParams<T>

Parameters:

clientProperties - Accumulo connection information

clientPropertiesPath

public InputFormatBuilder.TableParams<T> clientPropertiesPath(String clientPropsPath)

Description copied from interface: InputFormatBuilder.ClientParams

Set path to DFS location containing accumulo-client.properties file. This setting is more secure than InputFormatBuilder.ClientParams.clientProperties(Properties)

Specified by:

clientPropertiesPath in interface InputFormatBuilder.ClientParams<T>

Parameters:

clientPropsPath - DFS path to accumulo-client.properties

table

public InputFormatBuilder.InputFormatOptions<T> table(String tableName)

Description copied from interface: InputFormatBuilder.TableParams

Sets the name of the input table, over which this job will scan. At least one table is required before calling store(Job)

Specified by:

table in interface InputFormatBuilder.TableParams<T>

Parameters:

tableName - the table to use when the tablename is null in the write call

auths

public InputFormatBuilder.InputFormatOptions<T> auths(Authorizations auths)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Sets the Authorizations used to scan. Must be a subset of the user's authorizations. By Default, all of the users auths are set.

Specified by:

auths in interface InputFormatBuilder.InputFormatOptions<T>

Parameters:

auths - the user's authorizations

classLoaderContext

public InputFormatBuilder.InputFormatOptions<T> classLoaderContext(String context)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Sets the name of the classloader context on this scanner

Specified by:

classLoaderContext in interface InputFormatBuilder.InputFormatOptions<T>

Parameters:

context - name of the classloader context

ranges

public InputFormatBuilder.InputFormatOptions<T> ranges(Collection<Range> ranges)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Sets the input ranges to scan for the single input table associated with this job.

Specified by:

ranges in interface InputFormatBuilder.InputFormatOptions<T>

Parameters:

ranges - the ranges that will be mapped over

See Also:

• TableOperations.splitRangeByTablets(String, Range, int)

fetchColumns

public InputFormatBuilder.InputFormatOptions<T> fetchColumns(Collection<IteratorSetting.Column> fetchColumns)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Restricts the columns that will be mapped over for this job for the default input table.

Specified by:

fetchColumns in interface InputFormatBuilder.InputFormatOptions<T>

Parameters:

fetchColumns - a collection of IteratorSetting.Column objects corresponding to column family and column qualifier. If the column qualifier is null, the entire column family is selected. An empty set is the default and is equivalent to scanning all columns.

addIterator

public InputFormatBuilder.InputFormatOptions<T> addIterator(IteratorSetting cfg)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Encode an iterator on the single input table for this job. It is safe to call this method multiple times. If an iterator is added with the same name, it will be overridden.

Specified by:

addIterator in interface InputFormatBuilder.InputFormatOptions<T>

Parameters:

cfg - the configuration of the iterator

executionHints

public InputFormatBuilder.InputFormatOptions<T> executionHints(Map<String,String> hints)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Set these execution hints on scanners created for input splits. See ScannerBase.setExecutionHints(java.util.Map)

Specified by:

executionHints in interface InputFormatBuilder.InputFormatOptions<T>

samplerConfiguration

public InputFormatBuilder.InputFormatOptions<T> samplerConfiguration(SamplerConfiguration samplerConfig)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Causes input format to read sample data. If sample data was created using a different configuration or a tables sampler configuration changes while reading data, then the input format will throw an error.

Specified by:

samplerConfiguration in interface InputFormatBuilder.InputFormatOptions<T>

Parameters:

samplerConfig - The sampler configuration that sample must have been created with inorder for reading sample data to succeed.

See Also:

• ScannerBase.setSamplerConfiguration(SamplerConfiguration)

autoAdjustRanges

public InputFormatBuilder.InputFormatOptions<T> autoAdjustRanges(boolean value)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Disables the automatic adjustment of ranges for this job. This feature merges overlapping ranges, then splits them to align with tablet boundaries. Disabling this feature will cause exactly one Map task to be created for each specified range. Disabling has no effect for batch scans at it will always automatically adjust ranges.

By default, this feature is enabled.

Specified by:

autoAdjustRanges in interface InputFormatBuilder.InputFormatOptions<T>

See Also:

• InputFormatBuilder.InputFormatOptions.ranges(Collection)

scanIsolation

public InputFormatBuilder.InputFormatOptions<T> scanIsolation(boolean value)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Enables the use of the IsolatedScanner in this job.

By default, this feature is disabled.

Specified by:

scanIsolation in interface InputFormatBuilder.InputFormatOptions<T>

localIterators

public InputFormatBuilder.InputFormatOptions<T> localIterators(boolean value)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Enables the use of the ClientSideIteratorScanner in this job. This feature will cause the iterator stack to be constructed within the Map task, rather than within the Accumulo TServer. To use this feature, all classes needed for those iterators must be available on the classpath for the task.

By default, this feature is disabled.

Specified by:

localIterators in interface InputFormatBuilder.InputFormatOptions<T>

offlineScan

public InputFormatBuilder.InputFormatOptions<T> offlineScan(boolean value)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Enable reading offline tables. By default, this feature is disabled and only online tables are scanned. This will make the map reduce job directly read the table's files. If the table is not offline, then the job will fail. If the table comes online during the map reduce job, it is likely that the job will fail.

To use this option, the map reduce user will need access to read the Accumulo directory in HDFS.

Reading the offline table will create the scan time iterator stack in the map process. So any iterators that are configured for the table will need to be on the mapper's classpath.

One way to use this feature is to clone a table, take the clone offline, and use the clone as the input table for a map reduce job. If you plan to map reduce over the data many times, it may be better to the compact the table, clone it, take it offline, and use the clone for all map reduce jobs. The reason to do this is that compaction will reduce each tablet in the table to one file, and it is faster to read from one file.

There are two possible advantages to reading a tables file directly out of HDFS. First, you may see better read performance. Second, it will support speculative execution better. When reading an online table speculative execution can put more load on an already slow tablet server.

By default, this feature is disabled.

Specified by:

offlineScan in interface InputFormatBuilder.InputFormatOptions<T>

batchScan

public InputFormatBuilder.InputFormatOptions<T> batchScan(boolean value)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Enables the use of the BatchScanner in this job. Using this feature will group Ranges by their source tablet, producing an InputSplit per tablet rather than per Range. This batching helps to reduce overhead when querying a large number of small ranges. (ex: when doing quad-tree decomposition for spatial queries)

In order to achieve good locality of InputSplits this option always clips the input Ranges to tablet boundaries. This may result in one input Range contributing to several InputSplits.

Note: calls to InputFormatBuilder.InputFormatOptions.autoAdjustRanges(boolean) is ignored when BatchScan is enabled.

This configuration is incompatible with:

• InputFormatBuilder.InputFormatOptions.offlineScan(boolean)
• InputFormatBuilder.InputFormatOptions.localIterators(boolean)
• InputFormatBuilder.InputFormatOptions.scanIsolation(boolean)

By default, this feature is disabled.

Specified by:

batchScan in interface InputFormatBuilder.InputFormatOptions<T>

consistencyLevel

public InputFormatBuilder.InputFormatOptions<T> consistencyLevel(ScannerBase.ConsistencyLevel level)

Description copied from interface: InputFormatBuilder.InputFormatOptions

Enables the user to set the consistency level

Specified by:

consistencyLevel in interface InputFormatBuilder.InputFormatOptions<T>

store

public void store(T j)
           throws AccumuloException,
AccumuloSecurityException

Description copied from interface: InputFormatBuilder.TableParams

Finish configuring, verify and serialize options into the JobConf or Job

Specified by:

store in interface InputFormatBuilder.TableParams<T>

Throws:

AccumuloException

AccumuloSecurityException