Package org.apache.hadoop.hbase.regionserver

Class ScannerIdGenerator

java.lang.Object

org.apache.hadoop.hbase.regionserver.ScannerIdGenerator

@Private
public class ScannerIdGenerator
extends Object

Generate a new style scanner id to prevent collision with previous started server or other RSs. We have 64 bits to use. The first 32 bits are MurmurHash32 of ServerName string "host,port,ts". The ServerName contains both host, port, and start timestamp so it can prevent collision. The lowest 32bit is generated by atomic int.

Field Summary

Fields

Modifier and Type	Field	Description
private final AtomicInteger	scannerIdGen
private final long	serverNameHash

Constructor Summary

Constructors

Constructor	Description
ScannerIdGenerator(ServerName serverName)

Method Summary

Modifier and Type	Method	Description
long	generateNewScannerId()
static void	main(String[] args)

Methods inherited from class java.lang.Object

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

Field Details

serverNameHash

private final long serverNameHash

scannerIdGen

private final AtomicInteger scannerIdGen

Constructor Details

ScannerIdGenerator

public ScannerIdGenerator(ServerName serverName)

Method Details

generateNewScannerId

public long generateNewScannerId()

main

public static void main(String[] args)