org.apache.iotdb.db.conf.adapter

类 CompressionRatio

java.lang.Object

org.apache.iotdb.db.conf.adapter.CompressionRatio

public class CompressionRatio
extends Object

This class is used to count, compute and persist the compression ratio of tsfiles. Whenever the task of closing a file ends, the compression ratio of the file is calculated based on the total MemTable size and the total size of the tsfile on disk. compressionRatioSum records the sum of these compression ratios, and records the number of closed file tasks. When the compression rate of the current system is obtained, the average compression ratio is returned as the result, that is compressionRatioSum/. At the same time, each time the compression ratio statistics are updated, these two parameters are persisted on disk for system recovery.

方法概要

限定符和类型	方法和说明
double	getCompressionRatioSum()
static CompressionRatio	getInstance()
double	getRatio() Get the average compression ratio for all closed files
void	updateRatio(double currentCompressionRatio) Whenever the task of closing a file ends, the compression ratio of the file is calculated and call this method.

从类继承的方法 java.lang.Object

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

方法详细资料

updateRatio

public void updateRatio(double currentCompressionRatio)
                 throws IOException

Whenever the task of closing a file ends, the compression ratio of the file is calculated and call this method.

参数:

currentCompressionRatio - the compression ratio of the closing file.

抛出:

IOException

getRatio

public double getRatio()

Get the average compression ratio for all closed files

getCompressionRatioSum

public double getCompressionRatioSum()

getInstance

public static CompressionRatio getInstance()