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java.lang.Objectorg.apache.hadoop.hbase.mapred.TableInputFormat
public class TableInputFormat
Convert HBase tabular data into a format that is consumable by Map/Reduce
Field Summary | |
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static String |
COLUMN_LIST
space delimited list of columns |
Constructor Summary | |
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TableInputFormat()
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Method Summary | |
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void |
configure(JobConf job)
Initializes a new instance from a JobConf . |
RecordReader<HStoreKey,MapWritable> |
getRecordReader(InputSplit split,
JobConf job,
Reporter reporter)
Get the RecordReader for the given InputSplit . |
InputSplit[] |
getSplits(JobConf job,
int numSplits)
A split will be created for each HRegion of the input table |
void |
validateInput(JobConf job)
Check for validity of the input-specification for the job. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final String COLUMN_LIST
for column name wildcards
,
Constant Field ValuesConstructor Detail |
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public TableInputFormat()
Method Detail |
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public RecordReader<HStoreKey,MapWritable> getRecordReader(InputSplit split, JobConf job, Reporter reporter) throws IOException
InputFormat
RecordReader
for the given InputSplit
.
It is the responsibility of the RecordReader
to respect
record boundaries while processing the logical split to present a
record-oriented view to the individual task.
getRecordReader
in interface InputFormat<HStoreKey,MapWritable>
split
- the InputSplit
job
- the job that this split belongs to
RecordReader
IOException
public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException
getSplits
in interface InputFormat<HStoreKey,MapWritable>
job
- job configuration.numSplits
- the desired number of splits, a hint.
InputSplit
s for the job.
IOException
InputFormat.getSplits(org.apache.hadoop.mapred.JobConf, int)
public void configure(JobConf job)
JobConfigurable
JobConf
.
configure
in interface JobConfigurable
job
- the configurationpublic void validateInput(JobConf job) throws IOException
InputFormat
This method is used to validate the input directories when a job is
submitted so that the JobClient
can fail early, with an useful
error message, in case of errors. For e.g. input directory does not exist.
validateInput
in interface InputFormat<HStoreKey,MapWritable>
job
- job configuration.
InvalidInputException
- if the job does not have valid input
IOException
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