Hypertable::LoadStatistics Class Reference

Computes application load statistics. More...

#include <LoadStatistics.h>

Collaboration diagram for Hypertable::LoadStatistics:

Classes
struct	Bundle
	POD-style structure to hold statistics. More...

Public Member Functions
	LoadStatistics (int64_t compute_period)
	Constructor. More...
void	lock ()
	Locks m_mutex. More...
void	unlock ()
	Unlocks m_mutex. More...
void	add_scan_data (uint32_t count, uint32_t cells_scanned, uint32_t cells_returned, uint64_t bytes_scanned, uint64_t bytes_returned)
	Adds scan data to m_running statistics bundle. More...
void	add_cached_scan_data (uint32_t count, uint32_t cached_cells_returned, uint64_t cached_bytes_returned)
	Adds cached scan data to m_running statistics bundle. More...
void	add_update_data (uint32_t count, uint32_t cells, uint64_t total_bytes, uint32_t syncs)
	Adds scan data to m_running statistics bundle. More...
void	increment_compactions_major ()
void	increment_compactions_minor ()
void	increment_compactions_merging ()
void	increment_compactions_gc ()
void	recompute (Bundle *stats=0)
	Recomputes statistics. More...
void	get (Bundle *stats)
	Gets statistics for last completed time period. More...

Public Attributes
std::mutex	m_mutex
	Mutex for serializing concurrent access More...
int64_t	m_compute_period
std::chrono::steady_clock::time_point	m_start_time
Bundle	m_running
Bundle	m_computed

Detailed Description

Computes application load statistics.

This class is used to compute application load statistics including scans, updates and syncs. It is initialized with a time period over which the statistics are periodically gathered. The statistics for the most recent completed period are stored in the m_computed member, while the statistics being gathered for the current time period are stored in the m_running member.

Definition at line 52 of file LoadStatistics.h.

Constructor & Destructor Documentation

Hypertable::LoadStatistics::LoadStatistics ( int64_t  compute_period )

inline

Constructor.

Records start time of current period in m_start_time and clears the m_running and m_computed statistics bundles.

Parameters

compute_period

Time period over which statistics are gathered

Definition at line 96 of file LoadStatistics.h.

Member Function Documentation

void Hypertable::LoadStatistics::add_cached_scan_data ( uint32_t  count, uint32_t  cached_cells_returned, uint64_t  cached_bytes_returned  )

inline

Adds cached scan data to m_running statistics bundle.

Parameters

count	Scan count
cached_cells_returned	Count of cached cells returned
cached_bytes_returned	Count of cached bytes returned

Warning

This method must be called with m_mutex locked

Definition at line 132 of file LoadStatistics.h.

void Hypertable::LoadStatistics::add_scan_data ( uint32_t  count, uint32_t  cells_scanned, uint32_t  cells_returned, uint64_t  bytes_scanned, uint64_t  bytes_returned  )

inline

Adds scan data to m_running statistics bundle.

Parameters

count	Scan count
cells_scanned	Count of cells scanned
cells_returned	Count of cells returned
bytes_scanned	Count of bytes scanned
bytes_returned	Count of bytes returned

Warning

This method must be called with m_mutex locked

Definition at line 116 of file LoadStatistics.h.

void Hypertable::LoadStatistics::add_update_data ( uint32_t  count, uint32_t  cells, uint64_t  total_bytes, uint32_t  syncs  )

inline

Adds scan data to m_running statistics bundle.

Parameters

count	Update count
cells	Count of cells updated
total_bytes	Count of bytes updated
syncs	Sync count

Warning

This method must be called with m_mutex locked

Definition at line 146 of file LoadStatistics.h.

void Hypertable::LoadStatistics::get ( Bundle *  stats )

inline

Gets statistics for last completed time period.

Parameters

stats

Pointer to structure to hold statistics

Definition at line 220 of file LoadStatistics.h.

void Hypertable::LoadStatistics::increment_compactions_gc ( )

inline

Definition at line 168 of file LoadStatistics.h.

void Hypertable::LoadStatistics::increment_compactions_major ( )

inline

Definition at line 153 of file LoadStatistics.h.

void Hypertable::LoadStatistics::increment_compactions_merging ( )

inline

Definition at line 163 of file LoadStatistics.h.

void Hypertable::LoadStatistics::increment_compactions_minor ( )

inline

Definition at line 158 of file LoadStatistics.h.

void Hypertable::LoadStatistics::lock ( )

inline

Locks m_mutex.

Definition at line 103 of file LoadStatistics.h.

void Hypertable::LoadStatistics::recompute ( Bundle *  stats = 0 )

inline

Recomputes statistics.

This method first checks to see if m_compute_period milliseconds have elapsed since the statistics were last computed and if so, it copies m_running to m_computed, computes and sets the period_millis, scan_mbps, and update_mbps members of m_computed, clears m_running, and sets m_start_time to the current time. Otherwise, statistics recomputation is skipped. If stats is not NULL, then the m_computed member will be copied to it.

Parameters

stats

Output parameter to hold copy of last computed statistics

Definition at line 184 of file LoadStatistics.h.

void Hypertable::LoadStatistics::unlock ( )

inline

Unlocks m_mutex.

Definition at line 106 of file LoadStatistics.h.

Member Data Documentation

int64_t Hypertable::LoadStatistics::m_compute_period

Definition at line 229 of file LoadStatistics.h.

Bundle Hypertable::LoadStatistics::m_computed

Definition at line 238 of file LoadStatistics.h.

std::mutex Hypertable::LoadStatistics::m_mutex

Mutex for serializing concurrent access

Definition at line 226 of file LoadStatistics.h.

Bundle Hypertable::LoadStatistics::m_running

Definition at line 235 of file LoadStatistics.h.

std::chrono::steady_clock::time_point Hypertable::LoadStatistics::m_start_time

Definition at line 232 of file LoadStatistics.h.

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The documentation for this class was generated from the following file:

• /home/doug/src/hypertable/src/cc/Hypertable/RangeServer/LoadStatistics.h