public class MultiIterator extends HeapIterator
Constructor and Description |
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MultiIterator(List<SortedKeyValueIterator<Key,Value>> readers,
boolean init) |
MultiIterator(List<SortedKeyValueIterator<Key,Value>> iters2,
KeyExtent extent) |
MultiIterator(List<SortedKeyValueIterator<Key,Value>> iters,
Range seekFence) |
Modifier and Type | Method and Description |
---|---|
MultiIterator |
deepCopy(IteratorEnvironment env)
Creates a deep copy of this iterator as though seek had not yet been called.
|
void |
init(SortedKeyValueIterator<Key,Value> source,
Map<String,String> options,
IteratorEnvironment env)
Initializes the iterator.
|
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.
|
addSource, clear, createHeap, getTopKey, getTopValue, hasTop, next
public MultiIterator(List<SortedKeyValueIterator<Key,Value>> iters, Range seekFence)
public MultiIterator(List<SortedKeyValueIterator<Key,Value>> iters2, KeyExtent extent)
public MultiIterator(List<SortedKeyValueIterator<Key,Value>> readers, boolean init)
public MultiIterator deepCopy(IteratorEnvironment env)
SortedKeyValueIterator
env
- IteratorEnvironment environment in which iterator is being run.public void seek(Range range, Collection<ByteSequence> columnFamilies, boolean inclusive) throws IOException
SortedKeyValueIterator
SortedKeyValueIterator.init(org.apache.accumulo.core.iterators.SortedKeyValueIterator<K, V>, java.util.Map<java.lang.String, java.lang.String>, org.apache.accumulo.core.iterators.IteratorEnvironment)
is called.
Iterators that examine groups of adjacent key/value pairs (e.g. rows) to determine their top key and value should be sure that they properly handle a seek
to a key in the middle of such a group (e.g. the middle of a row). Even if the client always seeks to a range containing an entire group (a,c), the tablet
server could send back a batch of entries corresponding to (a,b], then reseek the iterator to range (b,c) when the scan is continued.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 void init(SortedKeyValueIterator<Key,Value> source, Map<String,String> options, IteratorEnvironment env) throws IOException
SortedKeyValueIterator
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.Copyright © 2012 The Apache Software Foundation. All Rights Reserved.