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java.lang.Objectorg.apache.accumulo.core.iterators.user.LargeRowFilter
public class LargeRowFilter
This iterator suppresses rows that exceed a specified number of columns. Once a row exceeds the threshold, a marker is emitted and the row is always suppressed by this iterator after that point in time. This iterator works in a similar way to the RowDeletingIterator. See its javadoc about locality groups.
| Nested Class Summary |
|---|
| Nested classes/interfaces inherited from interface org.apache.accumulo.core.iterators.OptionDescriber |
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OptionDescriber.IteratorOptions |
| Field Summary | |
|---|---|
static Value |
SUPPRESS_ROW_VALUE
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| Constructor Summary | |
|---|---|
LargeRowFilter()
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| Method Summary | |
|---|---|
SortedKeyValueIterator<Key,Value> |
deepCopy(IteratorEnvironment env)
Creates a deep copy of this iterator as though seek had not yet been called. |
OptionDescriber.IteratorOptions |
describeOptions()
Gets an iterator options object that contains information needed to configure this iterator. |
Key |
getTopKey()
Returns top key. |
Value |
getTopValue()
Returns top value. |
boolean |
hasTop()
Returns true if the iterator has more elements. |
void |
init(SortedKeyValueIterator<Key,Value> source,
Map<String,String> options,
IteratorEnvironment env)
Initializes the iterator. |
void |
next()
Advances to the next K,V pair. |
void |
seek(Range range,
Collection<ByteSequence> columnFamilies,
boolean inclusive)
Seeks to the first key in the Range, restricting the resulting K,V pairs to those with the specified columns. |
static void |
setMaxColumns(IteratorSetting is,
int maxColumns)
A convenience method for setting the maximum number of columns to keep. |
boolean |
validateOptions(Map<String,String> options)
Check to see if an options map contains all options required by an iterator and that the option values are in the expected formats. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
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public static final Value SUPPRESS_ROW_VALUE
| Constructor Detail |
|---|
public LargeRowFilter()
| Method Detail |
|---|
public void init(SortedKeyValueIterator<Key,Value> source,
Map<String,String> options,
IteratorEnvironment env)
throws IOException
SortedKeyValueIterator
init in interface SortedKeyValueIterator<Key,Value>source - SortedKeyValueIterator source to read data from.options - Map map of string option names to option values.env - IteratorEnvironment environment in which iterator is being run.
IOException - unused.public boolean hasTop()
SortedKeyValueIterator
hasTop in interface SortedKeyValueIterator<Key,Value>
public void next()
throws IOException
SortedKeyValueIterator
next in interface SortedKeyValueIterator<Key,Value>IOException - if an I/O error occurs.
public void seek(Range range,
Collection<ByteSequence> columnFamilies,
boolean inclusive)
throws IOException
SortedKeyValueIterator
seek in interface SortedKeyValueIterator<Key,Value>range - Range of keys to iterate over.columnFamilies - Collection of column families to include or exclude.inclusive - boolean that indicates whether to include (true) or exclude (false) column families.
IOException - if an I/O error occurs.public Key getTopKey()
SortedKeyValueIterator
getTopKey in interface SortedKeyValueIterator<Key,Value>public Value getTopValue()
SortedKeyValueIterator
getTopValue in interface SortedKeyValueIterator<Key,Value>public SortedKeyValueIterator<Key,Value> deepCopy(IteratorEnvironment env)
SortedKeyValueIterator
deepCopy in interface SortedKeyValueIterator<Key,Value>env - IteratorEnvironment environment in which iterator is being run.
public OptionDescriber.IteratorOptions describeOptions()
OptionDescriber
describeOptions in interface OptionDescriberpublic boolean validateOptions(Map<String,String> options)
OptionDescriber
validateOptions in interface OptionDescriberoptions - a map of option names to option values
public static void setMaxColumns(IteratorSetting is,
int maxColumns)
is - IteratorSetting object to configure.maxColumns - number of columns to keep.
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