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Generic Metrics

This page describes generic GridGain metrics.

Metric Registers

Metrics are grouped into categories called registers. Each register has a name. The full name of a specific metric within the register consists of the register name followed by a dot, followed by the name of the metric: <register_name>.<metric_name>. For example, the register for data storage metrics is called io.datastorage. The metric that return the storage size is called io.datastorage.StorageSize.

Metric Exporters

If you want to enable metrics, configure one or multiple metric exporters in the node configuration. This is a node-specific configuration, which means it enables metrics only on the node where it is specified.

<bean class="org.apache.ignite.configuration.IgniteConfiguration">
    <property name="metricExporterSpi">
        <list>
            <bean class="org.apache.ignite.spi.metric.jmx.JmxMetricExporterSpi"/>
            <bean class="org.apache.ignite.spi.metric.log.LogExporterSpi"/>
            <bean class="org.apache.ignite.spi.metric.opencensus.OpenCensusMetricExporterSpi"/>
        </list>
    </property>
</bean>
IgniteConfiguration cfg = new IgniteConfiguration();
cfg.setMetricExporterSpi(new JmxMetricExporterSpi());
Ignite ignite = Ignition.start(cfg);
This API is not presently available for C++. You can use XML configuration.

The following sections describe the exporters available in Ignite by default.

JMX

org.apache.ignite.spi.metric.jmx.JmxMetricExporterSpi exposes metrics via JMX beans.

IgniteConfiguration cfg = new IgniteConfiguration();
JmxMetricExporterSpi jmxExporter = new JmxMetricExporterSpi();
//export cache metrics only
jmxExporter.setExportFilter(mreg -> mreg.name().startsWith("cache."));
cfg.setMetricExporterSpi(jmxExporter);
This API is not presently available for C++.

SQL View

SqlViewMetricExporterSpi is enabled by default, SqlViewMetricExporterSpi exposes metrics via the SYS.METRICS view. Each metric is displayed as a single record. You can use any supported SQL tool to view the metrics:

> select name, value from SYS.METRICS where name LIKE 'cache.myCache.%';
+-----------------------------------+--------------------------------+
|                NAME               |             VALUE              |
+-----------------------------------+--------------------------------+
| cache.myCache.CacheTxRollbacks    | 0                              |
| cache.myCache.OffHeapRemovals     | 0                              |
| cache.myCache.QueryCompleted      | 0                              |
| cache.myCache.QueryFailed         | 0                              |
| cache.myCache.EstimatedRebalancingKeys | 0                         |
| cache.myCache.CacheEvictions      | 0                              |
| cache.myCache.CommitTime          | [J@2eb66498                    |
....

Log

org.apache.ignite.spi.metric.log.LogExporterSpi prints the metrics to the log file at regular intervals (1 min by default) at INFO level.

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:util="http://www.springframework.org/schema/util" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="         http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans.xsd         http://www.springframework.org/schema/util         http://www.springframework.org/schema/util/spring-util.xsd">
    <bean class="org.apache.ignite.configuration.IgniteConfiguration">
        <property name="metricExporterSpi">
            <list>
                <bean class="org.apache.ignite.spi.metric.log.LogExporterSpi"/>
            </list>
        </property>
    </bean>
</beans>

If you use programmatic configuration, you can change the print frequency as follows:

IgniteConfiguration cfg = new IgniteConfiguration();
LogExporterSpi logExporter = new LogExporterSpi();
logExporter.setPeriod(600_000);
//export cache metrics only
logExporter.setExportFilter(mreg -> mreg.name().startsWith("cache."));
cfg.setMetricExporterSpi(logExporter);
Ignite ignite = Ignition.start(cfg);

OpenCensus

org.apache.ignite.spi.metric.opencensus.OpenCensusMetricExporterSpi adds integration with the OpenCensus library.

To use the OpenCensus exporter:

  1. Enable the 'ignite-opencensus' module.

  2. Add org.apache.ignite.spi.metric.opencensus.OpenCensusMetricExporterSpi to the list of exporters in the node configuration.

  3. Configure OpenCensus StatsCollector to export to a specific system. See OpenCensusMetricsExporterExample.java for an example and OpenCensus documentation for additional information.

Configuration parameters:

  • filter - predicate that filters metrics.

  • period - export period.

  • sendInstanceName - if enabled, a tag with the Ignite instance name is added to each metric.

  • sendNodeId - if enabled, a tag with the Ignite node id is added to each metric.

  • sendConsistentId - if enabled, a tag with the Ignite node consistent id is added to each metric.

Available Metrics

System

System metrics such as JVM or CPU metrics.

Register name: sys

Name Type Description

CpuLoad

double

CPU load.

CurrentThreadCpuTime

long

ThreadMXBean.getCurrentThreadCpuTime()

CurrentThreadUserTime

long

ThreadMXBean.getCurrentThreadUserTime()

DaemonThreadCount

integer

ThreadMXBean.getDaemonThreadCount()

GcCpuLoad

double

GC CPU load.

PeakThreadCount

integer

ThreadMXBean.getPeakThreadCount

SystemLoadAverage

java.lang.Double

OperatingSystemMXBean.getSystemLoadAverage()

ThreadCount

integer

ThreadMXBean.getThreadCount

TotalExecutedTasks

long

Total executed tasks.

TotalStartedThreadCount

long

ThreadMXBean.getTotalStartedThreadCount

UpTime

long

RuntimeMxBean.getUptime()

memory.heap.committed

long

MemoryUsage.getHeapMemoryUsage().getCommitted()

memory.heap.init

long

MemoryUsage.getHeapMemoryUsage().getInit()

memory.heap.used

long

MemoryUsage.getHeapMemoryUsage().getUsed()

memory.nonheap.committed

long

MemoryUsage.getNonHeapMemoryUsage().getCommitted()

memory.nonheap.init

long

MemoryUsage.getNonHeapMemoryUsage().getInit()

memory.nonheap.max

long

MemoryUsage.getNonHeapMemoryUsage().getMax()

memory.nonheap.used

long

MemoryUsage.getNonHeapMemoryUsage().getUsed()

Caches

Cache metrics.

Register name: cache.{cache_name}.{near}

Name Type Description

CacheEvictions

long

The total number of evictions from the cache.

CacheGets

long

The total number of gets to the cache.

CacheHits

long

The number of get requests that were satisfied by the cache.

CacheMisses

long

A miss is a get request that is not satisfied.

CachePuts

long

The total number of puts to the cache.

CacheRemovals

long

The total number of removals from the cache.

CacheTxCommits

long

Total number of transaction commits.

CacheTxRollbacks

long

Total number of transaction rollbacks.

CacheSize

long

Local cache size.

CommitTime

histogram

Commit time in nanoseconds.

CommitTimeTotal

long

The total time of commit, in nanoseconds.

EntryProcessorHits

long

The total number of invocations on keys, which exist in cache.

EntryProcessorInvokeTimeNanos

long

The total time of cache invocations for which this node is the initiator, in nanoseconds.

EntryProcessorMaxInvocationTime

long

So far, the maximum time to execute cache invokes for which this node is the initiator.

EntryProcessorMinInvocationTime

long

So far, the minimum time to execute cache invokes for which this node is the initiator.

EntryProcessorMisses

long

The total number of invocations on keys, which don’t exist in cache.

EntryProcessorPuts

long

The total number of cache invocations, caused update.

EntryProcessorReadOnlyInvocations

long

The total number of cache invocations, caused no updates.

EntryProcessorRemovals

long

The total number of cache invocations, caused removals.

EstimatedRebalancingKeys

long

Number estimated to rebalance keys.

GetAllTime

histogram

GetAll time for which this node is the initiator, in nanoseconds.

GetTime

histogram

Get time for which this node is the initiator, in nanoseconds.

GetTimeTotal

long

The total time of cache gets for which this node is the initiator, in nanoseconds.

HeapEntriesCount

long

Onheap entries count.

IndexRebuildKeysProcessed

long

The number of keys with rebuilt indexes.

IsIndexRebuildInProgress

boolean

True if index build or rebuild is in progress.

OffHeapBackupEntriesCount

long

Offheap backup entries count.

OffHeapEntriesCount

long

Offheap entries count.

OffHeapEvictions

long

The total number of evictions from the off-heap memory.

OffHeapGets

long

The total number of get requests to the off-heap memory.

OffHeapHits

long

The number of get requests that were satisfied by the off-heap memory.

OffHeapMisses

long

A miss is a get request that is not satisfied by off-heap memory.

OffHeapPrimaryEntriesCount

long

Offheap primary entries count.

OffHeapPuts

long

The total number of put requests to the off-heap memory.

OffHeapRemovals

long

The total number of removals from the off-heap memory.

PutAllTime

histogram

PutAll time for which this node is the initiator, in nanoseconds.

PutTime

histogram

Put time for which this node is the initiator, in nanoseconds.

PutTimeTotal

long

The total time of cache puts for which this node is the initiator, in nanoseconds.

QueryCompleted

long

Count of completed queries.

QueryExecuted

long

Count of executed queries.

QueryFailed

long

Count of failed queries.

QueryMaximumTime

long

Maximum query execution time.

QueryMinimalTime

long

Minimum query execution time.

QuerySumTime

long

Query summary time.

RebalanceClearingPartitionsLeft

long

Number of partitions need to be cleared before actual rebalance start.

RebalanceStartTime

long

Rebalance start time.

RebalancedKeys

long

Number of already rebalanced keys.

RebalancingBytesRate

long

Estimated rebalancing speed in bytes.

RebalancingKeysRate

long

Estimated rebalancing speed in keys.

RemoveAllTime

histogram

RemoveAll time for which this node is the initiator, in nanoseconds.

RemoveTime

histogram

Remove time for which this node is the initiator. in nanoseconds.

RemoveTimeTotal

long

The total time of cache removal, in nanoseconds.

RollbackTime

histogram

Rollback time in nanoseconds.

RollbackTimeTotal

long

The total time of rollback, in nanoseconds.

TotalRebalancedBytes

long

Number of already rebalanced bytes.

Cache Groups

Register name: cacheGroups.{group_name}

Name Type Description

AffinityPartitionsAssignmentMap

java.util.Map

Affinity partitions assignment map.

Caches

java.util.ArrayList

List of caches

IndexBuildCountPartitionsLeft

long

Number of partitions need processed for finished indexes create or rebuilding.

LocalNodeMovingPartitionsCount

integer

Count of partitions with state MOVING for this cache group located on this node.

LocalNodeOwningPartitionsCount

integer

Count of partitions with state OWNING for this cache group located on this node.

LocalNodeRentingEntriesCount

long

Count of entries remains to evict in RENTING partitions located on this node for this cache group.

LocalNodeRentingPartitionsCount

integer

Count of partitions with state RENTING for this cache group located on this node.

MaximumNumberOfPartitionCopies

integer

Maximum number of partition copies for all partitions of this cache group.

MinimumNumberOfPartitionCopies

integer

Minimum number of partition copies for all partitions of this cache group.

MovingPartitionsAllocationMap

java.util.Map

Allocation map of partitions with state MOVING in the cluster.

OwningPartitionsAllocationMap

java.util.Map

Allocation map of partitions with state OWNING in the cluster.

PartitionIds

java.util.ArrayList

Local partition ids.

SparseStorageSize

long

Storage space allocated for group adjusted for possible sparsity, in bytes.

StorageSize

long

Storage space allocated for group, in bytes.

TotalAllocatedPages

long

Cache group total allocated pages.

TotalAllocatedSize

long

Total size of memory allocated for group, in bytes.

Transactions

Transaction metrics.

Register name: tx

Name Type Description

AllOwnerTransactions

java.util.HashMap

Map of local node owning transactions.

LockedKeysNumber

long

The number of keys locked on the node.

OwnerTransactionsNumber

long

The number of active transactions for which this node is the initiator.

TransactionsHoldingLockNumber

long

The number of active transactions holding at least one key lock.

LastCommitTime

long

Last commit time.

nodeSystemTimeHistogram

histogram

Transactions system times on node represented as histogram.

nodeUserTimeHistogram

histogram

Transactions user times on node represented as histogram.

LastRollbackTime

long

Last rollback time.

totalNodeSystemTime

long

Total transactions system time on node.

totalNodeUserTime

long

Total transactions user time on node.

txCommits

integer

Number of transaction commits.

txRollbacks

integer

Number of transaction rollbacks.

Partition Map Exchange

Partition map exchange metrics.

Register name: pme

Name Type Description

CacheOperationsBlockedDuration

long

Current PME cache operations blocked duration in milliseconds.

CacheOperationsBlockedDurationHistogram

histogram

Histogram of cache operations blocked PME durations in milliseconds.

Duration

long

Current PME duration in milliseconds.

DurationHistogram

histogram

Histogram of PME durations in milliseconds.

Compute Jobs

Register name: compute.jobs

Name Type Description

compute.jobs.Active

long

Number of active jobs currently executing.

compute.jobs.Canceled

long

Number of cancelled jobs that are still running.

compute.jobs.ExecutionTime

long

Total execution time of jobs.

compute.jobs.Finished

long

Number of finished jobs.

compute.jobs.Rejected

long

Number of jobs rejected after more recent collision resolution operation.

compute.jobs.Started

long

Number of started jobs.

compute.jobs.Waiting

long

Number of currently queued jobs waiting to be executed.

compute.jobs.WaitingTime

long

Total time jobs spent on waiting queue.

Thread Pools

Register name: threadPools.{thread_pool_name}

Name Type Description

ActiveCount

long

Approximate number of threads that are actively executing tasks.

CompletedTaskCount

long

Approximate total number of tasks that have completed execution.

CorePoolSize

long

The core number of threads.

KeepAliveTime

long

Thread keep-alive time, which is the amount of time which threads in excess of the core pool size may remain idle before being terminated.

LargestPoolSize

long

Largest number of threads that have ever simultaneously been in the pool.

MaximumPoolSize

long

The maximum allowed number of threads.

PoolSize

long

Current number of threads in the pool.

QueueSize

long

Current size of the execution queue.

RejectedExecutionHandlerClass

string

Class name of current rejection handler.

Shutdown

boolean

True if this executor has been shut down.

TaskCount

long

Approximate total number of tasks that have been scheduled for execution.

Terminated

boolean

True if all tasks have completed following shut down.

Terminating

long

True if terminating but not yet terminated.

ThreadFactoryClass

string

Class name of thread factory used to create new threads.

Cache Group IO

Register name: io.statistics.cacheGroups.{group_name}

Name Type Description

LOGICAL_READS

long

Number of logical reads

PHYSICAL_READS

long

Number of physical reads

grpId

integer

Group id

name

string

Name of the index

startTime

long

Statistics collect start time

Sorted Indexes

Register name: io.statistics.sortedIndexes.{cache_name}.{index_name}

Name Type Description

LOGICAL_READS_INNER

long

Number of logical reads for inner tree node

LOGICAL_READS_LEAF

long

Number of logical reads for leaf tree node

PHYSICAL_READS_INNER

long

Number of physical reads for inner tree node

PHYSICAL_READS_LEAF

long

Number of physical reads for leaf tree node

indexName

string

Name of the index

name

string

Name of the cache

startTime

long

Statistics collection start time

Hash Indexes

Register name: io.statistics.hashIndexes.{cache_name}.{index_name}

Name Type Description

LOGICAL_READS_INNER

long

Number of logical reads for inner tree node

LOGICAL_READS_LEAF

long

Number of logical reads for leaf tree node

PHYSICAL_READS_INNER

long

Number of physical reads for inner tree node

PHYSICAL_READS_LEAF

long

Number of physical reads for leaf tree node

indexName

string

Name of the index

name

string

Name of the cache

startTime

long

Statistics collection start time

Communication IO

Register name: io.communication

Name Type Description

ActiveSessionsCount

integer

Active TCP sessions count.

OutboundMessagesQueueSize

integer

Outbound messages queue size.

SentMessagesCount

integer

Sent messages count.

SentBytesCount

long

Sent bytes count.

ReceivedBytesCount

long

Received bytes count.

ReceivedMessagesCount

integer

Received messages count.

RejectedSslSessionsCount

integer

TCP sessions count that were rejected due to the SSL errors (metric is exported only if SSL is enabled).

SslEnabled

boolean

Indicates whether SSL is enabled.

SslHandshakeDurationHistogram

histogram

Histogram of SSL handshake duration in milliseconds (metric is exported only if SSL is enabled).

Ignite Thin Client Connector

Register name: client.connector

Name Type Description

ActiveSessionsCount

integer

Active TCP sessions count.

ReceivedBytesCount

long

Received bytes count.

RejectedSslSessionsCount

integer

TCP sessions count that were rejected due to the SSL errors (metric is exported only if SSL is enabled).

RejectedSessionsTimeout

integer

TCP sessions count that were rejected due to handshake timeout.

RejectedSessionsAuthenticationFailed

integer

TCP sessions count that were rejected due to failed authentication.

RejectedSessionsTotal

integer

Total number of rejected TCP connections.

{clientType}.AcceptedSessions

integer

Number of successfully established sessions for the client type.

{clientType}.ActiveSessions

integer

Number of active sessions for the client type.

SentBytesCount

long

Sent bytes count.

SslEnabled

boolean

Indicates whether SSL is enabled.

SslHandshakeDurationHistogram

histogram

Histogram of SSL handshake duration in milliseconds (metric is exported only if SSL is enabled).

Ignite REST Client Connector

Register name: rest.client

Name Type Description

ActiveSessionsCount

integer

Active TCP sessions count.

ReceivedBytesCount

long

Received bytes count.

RejectedSslSessionsCount

integer

TCP sessions count that were rejected due to the SSL errors (metric is exported only if SSL is enabled).

SentBytesCount

long

Sent bytes count.

SslEnabled

boolean

Indicates whether SSL is enabled.

SslHandshakeDurationHistogram

histogram

Histogram of SSL handshake duration in milliseconds (metric is exported only if SSL is enabled).

Discovery IO

Register name: io.discovery

Name Type Description

CoordinatorSince

long

Timestamp since which the local node became the coordinator (metric is exported only from server nodes).

Coordinator

UUID

Coordinator ID (metric is exported only from server nodes).

CurrentTopologyVersion

long

Current topology version.

JoinedNodes

integer

Joined nodes count.

LeftNodes

integer

Left nodes count.

MessageWorkerQueueSize

integer

Current message worker queue size.

PendingMessagesRegistered

integer

Pending registered messages count.

RejectedSslConnectionsCount

integer

TCP discovery connections count that were rejected due to the SSL errors.

SslEnabled

boolean

Indicates whether SSL is enabled.

TotalProcessedMessages

integer

Total processed messages count.

TotalReceivedMessages

integer

Total received messages count.

Data Region IO

Register name: io.dataregion.{data_region_name}

Name Type Description

AllocationRate

long

Allocation rate (pages per second) averaged across rateTimeInternal.

CheckpointBufferSize

long

Checkpoint buffer size in bytes.

DirtyPages

long

Number of pages in memory not yet synchronized with persistent storage.

EmptyDataPages

long

Calculates empty data pages count for region. It counts only totally free pages that can be reused (e. g. pages that are contained in reuse bucket of free list).

EvictionRate

long

Eviction rate (pages per second).

LargeEntriesPagesCount

long

Count of pages that fully ocupied by large entries that go beyond page size

OffHeapSize

long

Offheap size in bytes.

OffheapUsedSize

long

Offheap used size in bytes.

PagesFillFactor

double

The percentage of the used space.

PagesRead

long

Number of pages read from last restart.

PagesReplaceAge

long

Average age at which pages in memory are replaced with pages from persistent storage (milliseconds).

PagesReplaceRate

long

Rate at which pages in memory are replaced with pages from persistent storage (pages per second).

PagesReplaced

long

Number of pages replaced from last restart.

PagesWritten

long

Number of pages written from last restart.

PhysicalMemoryPages

long

Number of pages residing in physical RAM.

PhysicalMemorySize

long

Gets total size of pages loaded to the RAM, in bytes

TotalAllocatedPages

long

Total number of allocated pages.

TotalAllocatedSize

long

Gets a total size of memory allocated in the data region, in bytes

TotalThrottlingTime

long

Total throttling threads time in milliseconds. The Ignite throttles threads that generate dirty pages during the ongoing checkpoint.

UsedCheckpointBufferSize

long

Gets used checkpoint buffer size in bytes

Data Storage

Data Storage metrics.

Register name: io.datastorage

Name Type Description

CheckpointBeforeLockHistogram

histogram

Histogram of checkpoint action before taken write lock duration in milliseconds.

CheckpointFsyncHistogram

histogram

Histogram of checkpoint fsync duration in milliseconds.

CheckpointHistogram

histogram

Histogram of checkpoint duration in milliseconds.

CheckpointListenersExecuteHistogram

histogram

Histogram of checkpoint execution listeners under write lock duration in milliseconds.

CheckpointLockHoldHistogram

histogram

Histogram of checkpoint lock hold duration in milliseconds.

CheckpointLockWaitHistogram

histogram

Histogram of checkpoint lock wait duration in milliseconds.

CheckpointMarkHistogram

histogram

Histogram of checkpoint mark duration in milliseconds.

CheckpointPagesWriteHistogram

histogram

Histogram of checkpoint pages write duration in milliseconds.

CheckpointSplitAndSortPagesHistogram

histogram

Histogram of splitting and sorting checkpoint pages duration in milliseconds.

CheckpointTotalTime

long

Total duration of checkpoint

CheckpointWalRecordFsyncHistogram

histogram

Histogram of the WAL fsync after logging ChTotalNodeseckpointRecord on begin of checkpoint duration in milliseconds.

CheckpointWriteEntryHistogram

histogram

Histogram of entry buffer writing to file duration in milliseconds.

LastCheckpointBeforeLockDuration

long

Duration of the checkpoint action before taken write lock in milliseconds.

LastCheckpointCopiedOnWritePagesNumber

long

Number of pages copied to a temporary checkpoint buffer during the last checkpoint.

LastCheckpointDataPagesNumber

long

Total number of data pages written during the last checkpoint.

LastCheckpointDuration

long

Duration of the last checkpoint in milliseconds.

LastCheckpointFsyncDuration

long

Duration of the sync phase of the last checkpoint in milliseconds.

LastCheckpointListenersExecuteDuration

long

Duration of the checkpoint execution listeners under write lock in milliseconds.

LastCheckpointLockHoldDuration

long

Duration of the checkpoint lock hold in milliseconds.

LastCheckpointLockWaitDuration

long

Duration of the checkpoint lock wait in milliseconds.

LastCheckpointMarkDuration

long

Duration of the checkpoint mark in milliseconds.

LastCheckpointPagesWriteDuration

long

Duration of the checkpoint pages write in milliseconds.

LastCheckpointTotalPagesNumber

long

Total number of pages written during the last checkpoint.

LastCheckpointSplitAndSortPagesDuration

long

Duration of splitting and sorting checkpoint pages of the last checkpoint in milliseconds.

LastCheckpointStart

long

Start timestamp of the last checkpoint.

LastCheckpointWalRecordFsyncDuration

long

Duration of the WAL fsync after logging CheckpointRecord on the start of the last checkpoint in milliseconds.

LastCheckpointWriteEntryDuration

long

Duration of entry buffer writing to file of the last checkpoint in milliseconds.

SparseStorageSize

long

Storage space allocated adjusted for possible sparsity, in bytes.

StorageSize

long

Storage space allocated, in bytes.

WalArchiveSegments

integer

Current number of WAL segments in the WAL archive.

WalBuffPollSpinsRate

long

WAL buffer poll spins number over the last time interval.

WalFsyncTimeDuration

long

Total duration of fsync

WalFsyncTimeNum

long

Total count of fsync

WalLastRollOverTime

long

Time of the last WAL segment rollover.

WalLoggingRate

long

Average number of WAL records per second written during the last time interval.

WalTotalSize

long

Total size in bytes for storage wal files.

WalWritingRate

long

Average number of bytes per second written during the last time interval.

Cluster

Cluster metrics.

Register name: cluster

Name Type Description

ActiveBaselineNodes

integer

Active baseline nodes count.

Rebalanced

boolean

True if the cluster has fully achieved rebalanced state. Note that an inactive cluster always has this metric in False regardless of the real partitions state.

TotalBaselineNodes

integer

Total baseline nodes count.

TotalClientNodes

integer

Client nodes count.

TotalServerNodes

integer

Server nodes count.

SQL

SQL metrics.

Memory Quotas

Register name: sql.memory.quotas

Name Type Description

OffloadedQueriesNumber

number

Number of queries that were offloaded to disk locally

OffloadingRead

bytes

Number of bytes read from the disk during SQL query offloading

OffloadingWritten

bytes

Number of bytes written to the disk during SQL query offloading

freeMem

bytes

Amount of memory left available for the queries on this node, in bytes (negative value if SQL memory quotas are disabled)

maxMem

bytes

Total amount of memory available for all queries on the current node (negative value if SQL memory quotas are disabled)

requests

number

Total number of times memory quota has been requested on the current node by all the queries

Parser Cache

Register name: sql.parser.cache

Name Type Description

hits

number

Number of hits for queries cache

misses

number

Number of misses for queries cache

User Queries

Register name: sql.parser.cache

canceled number Number of canceled queries initiated by the current node. This number is included in the general 'failed' metric.

failed

number

Number of failed queries (including OOME) initiated by the current node

failedByOOM

number

Number of queries failed due to out of memory protection initiated by the current node. This number is included in the general 'failed' metric.

success

number

Number of successfully executed queries initiated by the current node

Throttling

Throttling metrics for the Write operation. Speed-based throttling protects the checkpoint buffer and the clean pages in the region. The checkpoint buffer needs a stronger protection because an overflow of this buffer makes a node crash. When performing a Write operation, we first check whether the checkpoint buffer is in danger. If it is, we employ the exponential backoff algorithm to protect the buffer: each subsequent "sleep" time is K times longer than the previous one. If the checkpoint buffer is not in danger, we calculate the "sleep" time using the speed-based algorithm to protect the pool of clean pages.

Register name: io.dataregion

Name Type Description

SpeedBasedThrottlingPercentage

double

Fraction of throttling time within average marking time (e.g., "quarter" = 0.25).

MarkDirtySpeed

long

Speed of marking pages dirty, in pages/second. Value is averaged over the last 3 fragments, 0.25 sec each, plus the current fragment, 0-0.25 sec (0.75-1.0 sec total).

CpWriteSpeed

long

Checkpoint write speed, in pages/second. Value is averaged over the last 3 checkpoints plus the current one.

LastEstimatedSpeedForMarkAll

long

Last estimated speed of marking all clean pages dirty to the end of a checkpoint, in pages/second.

CurrDirtyRatio

double

Current ratio of dirty pages (dirty vs total), expressed as a fraction. The fraction is computed for each segment in the current region, and the highest value becomes "current."

TargetDirtyRatio

double

Ratio of dirty pages (dirty vs total), expressed as a fraction. Throttling starts when this ratio is reached.

ThrottleParkTime

long

Park (sleep) time for the Write operation, in nanoseconds. Value is averaged over the last 3 fragments, 0.25 sec each, plus the current fragment, 0-0.25 sec (0.75-1.0 sec total). It defines park periods for either the checkpoint buffer protection or the clean page pool protection.

CpTotalPages

int

Number of pages in the current checkpoint.

CpEvictedPages

int

Number of evicted pages in the current checkpoint.

CpWrittenPages

int

Number of written pages in the current checkpoint.

CpSyncedPages

int

Number of fsynced pages in the current checkpoint.

CheckpointBufferPagesCount

int

Number of occupied pages in the checkpoint buffer.

CheckpointBufferPagesSize

int

Total number of pages in the checkpoint buffer.

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Last updated on May 25, 2023