org.apache.cassandra.service.disk.usage

Class DiskUsageMonitor

java.lang.Object

org.apache.cassandra.service.disk.usage.DiskUsageMonitor

public class DiskUsageMonitor
extends java.lang.Object

Schedule periodic task to monitor local disk usage and notify DiskUsageBroadcaster if local state changed.

Field Summary

Fields

Modifier and Type	Field and Description
static DiskUsageMonitor	instance

Constructor Summary

Constructors

Constructor and Description
DiskUsageMonitor()
DiskUsageMonitor(java.util.function.Supplier<com.google.common.collect.Multimap<java.nio.file.FileStore,Directories.DataDirectory>> dataDirectoriesSupplier)

Method Summary

Modifier and Type	Method and Description
long	getAllMemtableSize()
double	getDiskUsage()
DiskUsageState	getState(long usagePercentage)
void	start(java.util.function.Consumer<DiskUsageState> notifier) Start monitoring local disk usage and call notifier when local disk usage state changed.
DiskUsageState	state()
static long	totalDiskSpace()
static long	totalSpace(java.nio.file.FileStore store)
void	updateLocalState(double usageRatio, java.util.function.Consumer<DiskUsageState> notifier)
static long	usableSpace(java.nio.file.FileStore store)

Methods inherited from class java.lang.Object

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

Field Detail

instance

public static DiskUsageMonitor instance

Constructor Detail

DiskUsageMonitor

public DiskUsageMonitor()

DiskUsageMonitor

public DiskUsageMonitor(java.util.function.Supplier<com.google.common.collect.Multimap<java.nio.file.FileStore,Directories.DataDirectory>> dataDirectoriesSupplier)

Method Detail

start

public void start(java.util.function.Consumer<DiskUsageState> notifier)

Start monitoring local disk usage and call notifier when local disk usage state changed.

updateLocalState

public void updateLocalState(double usageRatio,
                             java.util.function.Consumer<DiskUsageState> notifier)

state

public DiskUsageState state()

Returns:

local node disk usage state

getDiskUsage

public double getDiskUsage()

Returns:

The current disk usage (including all memtable sizes) ratio. This is the ratio between the space taken by all the data directories and the addition of that same space and the free available space on disk. The space taken by the data directories is the addition of the actual space on disk plus the size of the memtables. Memtables are included in that calculation because they are expected to be eventually flushed to disk.

getAllMemtableSize

public long getAllMemtableSize()

getState

public DiskUsageState getState(long usagePercentage)

totalDiskSpace

public static long totalDiskSpace()

totalSpace

public static long totalSpace(java.nio.file.FileStore store)

usableSpace

public static long usableSpace(java.nio.file.FileStore store)