org.apache.accumulo.server.util

Class TabletIterator

java.lang.Object

org.apache.accumulo.server.util.TabletIterator

All Implemented Interfaces:

Iterator<Map<Key,Value>>

public class TabletIterator
extends Object
implements Iterator<Map<Key,Value>>

This class iterates over the metadata table returning all key values for a tablet in one chunk. As it scans the metadata table it checks the correctness of the metadata table, and rescans if needed. So the tablet key/values returned by this iterator should satisfy the sorted linked list property of the metadata table. The purpose of this is to hide inconsistencies caused by splits and detect anomalies in the metadata table. If a tablet that was returned by this iterator is subsequently deleted from the metadata table, then this iterator will throw a TabletDeletedException. This could occur when a table is merged.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TabletIterator.TabletDeletedException

Constructor Summary

Constructors

Constructor and Description
TabletIterator(Scanner s, Range range, boolean returnPrevEndRow, boolean returnDir)

Method Summary

Modifier and Type	Method and Description
boolean	hasNext()
Map<Key,Value>	next()
void	remove()
protected void	resetScanner()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Detail

TabletIterator

public TabletIterator(Scanner s,
                      Range range,
                      boolean returnPrevEndRow,
                      boolean returnDir)

Parameters:

s - A scanner over the entire metadata table configure to fetch needed columns.

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<Map<Key,Value>>

next

public Map<Key,Value> next()

Specified by:

next in interface Iterator<Map<Key,Value>>

remove

public void remove()

Specified by:

remove in interface Iterator<Map<Key,Value>>

resetScanner

protected void resetScanner()