Package org.apache.iotdb.db.wal.allocation

Class RoundRobinStrategy

java.lang.Object

org.apache.iotdb.db.wal.allocation.AbstractNodeAllocationStrategy

org.apache.iotdb.db.wal.allocation.RoundRobinStrategy

All Implemented Interfaces:

NodeAllocationStrategy

public class RoundRobinStrategy
extends AbstractNodeAllocationStrategy

This strategy creates n wal nodes and allocate them by round-robin strategy. In other words, several identifiers (like data regions) can share one wal node.

Field Summary

Fields inherited from class org.apache.iotdb.db.wal.allocation.AbstractNodeAllocationStrategy

folderManager

Constructor Summary

Constructors

Constructor	Description
RoundRobinStrategy(int maxWalNodeNum)

Method Summary

Modifier and Type	Method	Description
IWALNode	applyForWALNode(java.lang.String applicantUniqueId)	Allocate one wal node for the applicant
void	clear()
java.util.List<WALNode>	getNodesSnapshot()	Get all wal nodes

Methods inherited from class org.apache.iotdb.db.wal.allocation.AbstractNodeAllocationStrategy

createWALNode, createWALNode, createWALNode

Methods inherited from class java.lang.Object

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

Constructor Detail

RoundRobinStrategy

public RoundRobinStrategy(int maxWalNodeNum)

Method Detail

applyForWALNode

public IWALNode applyForWALNode(java.lang.String applicantUniqueId)

Description copied from interface: NodeAllocationStrategy

Allocate one wal node for the applicant

getNodesSnapshot

public java.util.List<WALNode> getNodesSnapshot()

Description copied from interface: NodeAllocationStrategy

Get all wal nodes

clear

public void clear()