Package org.apache.druid.java.util.metrics

Class CgroupUtil

java.lang.Object

org.apache.druid.java.util.metrics.CgroupUtil

public class CgroupUtil
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final String	COMMA_MATCH
static final String	CPU_SYS_USAGE_METRIC
static final String	CPU_TOTAL_USAGE_METRIC
static final String	CPU_USER_USAGE_METRIC
static final String	DISK_READ_BYTES_METRIC
static final String	DISK_READ_COUNT_METRIC
static final String	DISK_WRITE_BYTES_METRIC
static final String	DISK_WRITE_COUNT_METRIC
static final String	SPACE_MATCH
static final String	SYSTEM
static final String	TOTAL
static final String	USER

Constructor Summary

Constructors

Constructor	Description
CgroupUtil()

Method Summary

Modifier and Type	Method	Description
static double	computeProcessorQuota(long quotaUs, long periodUs)	Calculates the total cores allocated through quotas.
static long	readLongValue(CgroupDiscoverer discoverer, String cgroup, String fileName, long defaultValue)

Methods inherited from class java.lang.Object

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

Field Details

SPACE_MATCH

public static final String SPACE_MATCH

COMMA_MATCH

public static final String COMMA_MATCH

TOTAL

public static final String TOTAL

See Also:

• Constant Field Values

USER

public static final String USER

See Also:

• Constant Field Values

SYSTEM

public static final String SYSTEM

See Also:

• Constant Field Values

CPU_TOTAL_USAGE_METRIC

public static final String CPU_TOTAL_USAGE_METRIC

See Also:

• Constant Field Values

CPU_USER_USAGE_METRIC

public static final String CPU_USER_USAGE_METRIC

See Also:

• Constant Field Values

CPU_SYS_USAGE_METRIC

public static final String CPU_SYS_USAGE_METRIC

See Also:

• Constant Field Values

DISK_READ_BYTES_METRIC

public static final String DISK_READ_BYTES_METRIC

See Also:

• Constant Field Values

DISK_READ_COUNT_METRIC

public static final String DISK_READ_COUNT_METRIC

See Also:

• Constant Field Values

DISK_WRITE_BYTES_METRIC

public static final String DISK_WRITE_BYTES_METRIC

See Also:

• Constant Field Values

DISK_WRITE_COUNT_METRIC

public static final String DISK_WRITE_COUNT_METRIC

See Also:

• Constant Field Values

Constructor Details

CgroupUtil

public CgroupUtil()

Method Details

readLongValue

public static long readLongValue(CgroupDiscoverer discoverer,
 String cgroup,
 String fileName,
 long defaultValue)

computeProcessorQuota

public static double computeProcessorQuota(long quotaUs,
 long periodUs)

Calculates the total cores allocated through quotas. A negative value indicates that no quota has been specified. We use -1 because that's the default value used in the cgroup.

Parameters:

quotaUs - the cgroup quota value.

periodUs - the cgroup period value.

Returns:

the calculated processor quota, -1 if no quota or period set.