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java.lang.Object org.apache.accumulo.core.file.map.MyMapFile.Reader
public static class MyMapFile.Reader
Provide access to an existing map.
Constructor Summary | |
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MyMapFile.Reader(org.apache.hadoop.fs.FileSystem fs,
java.lang.String dirName,
org.apache.hadoop.conf.Configuration conf)
Construct a map reader for the named map. |
|
MyMapFile.Reader(org.apache.hadoop.fs.FileSystem fs,
java.lang.String dirName,
org.apache.hadoop.io.WritableComparator comparator,
org.apache.hadoop.conf.Configuration conf)
Construct a map reader for the named map using the named comparator. |
protected |
MyMapFile.Reader(org.apache.hadoop.fs.FileSystem fs,
java.lang.String dirName,
org.apache.hadoop.io.WritableComparator comparator,
org.apache.hadoop.conf.Configuration conf,
boolean open)
Hook to allow subclasses to defer opening streams until further initialization is complete. |
Method Summary | |
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void |
close()
Close the map. |
void |
closeDeepCopies()
|
protected MySequenceFile.Reader |
createDataFileReader(org.apache.hadoop.fs.FileSystem fs,
org.apache.hadoop.fs.Path dataFile,
org.apache.hadoop.conf.Configuration conf)
Override this method to specialize the type of MySequenceFile.Reader returned. |
SortedKeyValueIterator<Key,Value> |
deepCopy(IteratorEnvironment env)
Creates a deep copy of this iterator as though seek had not yet been called. |
void |
dropIndex()
|
void |
finalKey(org.apache.hadoop.io.WritableComparable key)
Reads the final key from the file. |
org.apache.hadoop.io.Writable |
get(org.apache.hadoop.io.WritableComparable key,
org.apache.hadoop.io.Writable val)
Return the value for the named key, or null if none exists. |
org.apache.hadoop.io.WritableComparable |
getClosest(org.apache.hadoop.io.WritableComparable key,
org.apache.hadoop.io.Writable val)
Finds the record that is the closest match to the specified key. |
org.apache.hadoop.io.WritableComparable |
getClosest(org.apache.hadoop.io.WritableComparable key,
org.apache.hadoop.io.Writable val,
boolean before)
Finds the record that is the closest match to the specified key. |
org.apache.hadoop.io.WritableComparable |
getClosest(org.apache.hadoop.io.WritableComparable key,
org.apache.hadoop.io.Writable val,
boolean before,
org.apache.hadoop.io.WritableComparable lastKey)
|
Key |
getFirstKey()
|
int |
getIndexPosition(org.apache.hadoop.io.WritableComparable key)
|
java.lang.Class |
getKeyClass()
Returns the class of keys in this file. |
Key |
getLastKey()
|
java.io.DataInputStream |
getMetaStore(java.lang.String name)
|
Key |
getTopKey()
Returns top key. |
Value |
getTopValue()
Returns top value. |
java.lang.Class |
getValueClass()
Returns the class of values in this file. |
boolean |
hasTop()
Returns true if the iterator has more elements. |
void |
init(SortedKeyValueIterator<Key,Value> source,
java.util.Map<java.lang.String,java.lang.String> options,
IteratorEnvironment env)
Initializes the iterator. |
org.apache.hadoop.io.WritableComparable |
midKey()
Get the key at approximately the middle of the file. |
void |
next()
Advances to the next K,V pair. |
boolean |
next(org.apache.hadoop.io.WritableComparable key,
org.apache.hadoop.io.Writable val)
Read the next key/value pair in the map into key and val . |
protected void |
open(org.apache.hadoop.fs.FileSystem fs,
java.lang.String dirName,
org.apache.hadoop.io.WritableComparator comparator,
org.apache.hadoop.conf.Configuration conf)
|
void |
printIndex()
|
void |
reset()
Re-positions the reader before its first key. |
void |
seek(Range range,
java.util.Collection<ByteSequence> columnFamilies,
boolean inclusive)
An iterator must seek to the first key in the range taking inclusiveness into account. |
boolean |
seek(org.apache.hadoop.io.WritableComparable key)
Positions the reader at the named key, or if none such exists, at the first entry after the named key. |
boolean |
seek(org.apache.hadoop.io.WritableComparable key,
org.apache.hadoop.io.WritableComparable lastKey)
|
void |
setInterruptFlag(java.util.concurrent.atomic.AtomicBoolean flag)
|
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MyMapFile.Reader(org.apache.hadoop.fs.FileSystem fs, java.lang.String dirName, org.apache.hadoop.conf.Configuration conf) throws java.io.IOException
java.io.IOException
public MyMapFile.Reader(org.apache.hadoop.fs.FileSystem fs, java.lang.String dirName, org.apache.hadoop.io.WritableComparator comparator, org.apache.hadoop.conf.Configuration conf) throws java.io.IOException
java.io.IOException
protected MyMapFile.Reader(org.apache.hadoop.fs.FileSystem fs, java.lang.String dirName, org.apache.hadoop.io.WritableComparator comparator, org.apache.hadoop.conf.Configuration conf, boolean open) throws java.io.IOException
java.io.IOException
createDataFileReader(FileSystem, Path, Configuration)
Method Detail |
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public java.lang.Class getKeyClass()
public java.lang.Class getValueClass()
public SortedKeyValueIterator<Key,Value> deepCopy(IteratorEnvironment env)
SortedKeyValueIterator
deepCopy
in interface SortedKeyValueIterator<Key,Value>
env
- IteratorEnvironment environment in which iterator is being run.
public void closeDeepCopies() throws java.io.IOException
closeDeepCopies
in interface FileSKVIterator
java.io.IOException
protected void open(org.apache.hadoop.fs.FileSystem fs, java.lang.String dirName, org.apache.hadoop.io.WritableComparator comparator, org.apache.hadoop.conf.Configuration conf) throws java.io.IOException
java.io.IOException
protected MySequenceFile.Reader createDataFileReader(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path dataFile, org.apache.hadoop.conf.Configuration conf) throws java.io.IOException
MySequenceFile.Reader
returned.
java.io.IOException
public void reset() throws java.io.IOException
java.io.IOException
public org.apache.hadoop.io.WritableComparable midKey() throws java.io.IOException
java.io.IOException
public void finalKey(org.apache.hadoop.io.WritableComparable key) throws java.io.IOException
key
- key to read into
java.io.IOException
public boolean seek(org.apache.hadoop.io.WritableComparable key) throws java.io.IOException
java.io.IOException
public boolean seek(org.apache.hadoop.io.WritableComparable key, org.apache.hadoop.io.WritableComparable lastKey) throws java.io.IOException
java.io.IOException
public int getIndexPosition(org.apache.hadoop.io.WritableComparable key) throws java.io.IOException
java.io.IOException
public void printIndex() throws java.io.IOException
java.io.IOException
public boolean next(org.apache.hadoop.io.WritableComparable key, org.apache.hadoop.io.Writable val) throws java.io.IOException
key
and val
. Returns true if such a pair exists and false when at the end of the
map
java.io.IOException
public org.apache.hadoop.io.Writable get(org.apache.hadoop.io.WritableComparable key, org.apache.hadoop.io.Writable val) throws java.io.IOException
java.io.IOException
public org.apache.hadoop.io.WritableComparable getClosest(org.apache.hadoop.io.WritableComparable key, org.apache.hadoop.io.Writable val) throws java.io.IOException
key
or if it does not exist, at the first entry after the named
key. - *
key
- - key that we're trying to find - *val
- - data value if key is found - *
java.io.IOException
public org.apache.hadoop.io.WritableComparable getClosest(org.apache.hadoop.io.WritableComparable key, org.apache.hadoop.io.Writable val, boolean before) throws java.io.IOException
key
- - key that we're trying to findval
- - data value if key is foundbefore
- - IF true, and key
does not exist, return the first entry that falls just before the key
. Otherwise, return the record
that sorts just after.
java.io.IOException
public org.apache.hadoop.io.WritableComparable getClosest(org.apache.hadoop.io.WritableComparable key, org.apache.hadoop.io.Writable val, boolean before, org.apache.hadoop.io.WritableComparable lastKey) throws java.io.IOException
java.io.IOException
public void close() throws java.io.IOException
close
in interface FileSKVIterator
java.io.IOException
public Key getTopKey()
SortedKeyValueIterator
getTopKey
in interface SortedKeyValueIterator<Key,Value>
public Value getTopValue()
SortedKeyValueIterator
getTopValue
in interface SortedKeyValueIterator<Key,Value>
public boolean hasTop()
SortedKeyValueIterator
hasTop
in interface SortedKeyValueIterator<Key,Value>
public void init(SortedKeyValueIterator<Key,Value> source, java.util.Map<java.lang.String,java.lang.String> options, IteratorEnvironment env) throws java.io.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.
java.io.IOException
- unused.public void next() throws java.io.IOException
SortedKeyValueIterator
next
in interface SortedKeyValueIterator<Key,Value>
java.io.IOException
- if an I/O error occurs.public void seek(Range range, java.util.Collection<ByteSequence> columnFamilies, boolean inclusive) throws java.io.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.
java.io.IOException
- if an I/O error occurs.public Key getFirstKey() throws java.io.IOException
getFirstKey
in interface FileSKVIterator
java.io.IOException
public Key getLastKey() throws java.io.IOException
getLastKey
in interface FileSKVIterator
java.io.IOException
public java.io.DataInputStream getMetaStore(java.lang.String name) throws java.io.IOException
getMetaStore
in interface FileSKVIterator
java.io.IOException
public void dropIndex()
public void setInterruptFlag(java.util.concurrent.atomic.AtomicBoolean flag)
setInterruptFlag
in interface InterruptibleIterator
|
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