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java.lang.Objectorg.apache.accumulo.examples.simple.filedata.ChunkCombiner
public class ChunkCombiner
This iterator dedupes chunks and sets their visibilities to the combined visibility of the refs columns. For example, it would combine
row1 refs uid1\0a A&B V0
row1 refs uid2\0b C&D V0
row1 ~chunk 0 A&B V1
row1 ~chunk 0 C&D V1
row1 ~chunk 0 E&F V1
row1 ~chunk 0 G&H V1
into the following
row1 refs uid1\0a A&B V0
row1 refs uid2\0b C&D V0
row1 ~chunk 0 (A&B)|(C&D) V1
VisibilityCombiner is used to combie the visibilities.
| Constructor Summary | |
|---|---|
ChunkCombiner()
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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. |
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. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public ChunkCombiner()
| 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.
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