com.hazelcast.internal.diagnostics

Class OverloadedConnectionsPlugin

java.lang.Object

com.hazelcast.internal.diagnostics.DiagnosticsPlugin

com.hazelcast.internal.diagnostics.OverloadedConnectionsPlugin

public class OverloadedConnectionsPlugin
extends DiagnosticsPlugin

The OverloadedConnectionsPlugin checks all the connections and samples the content of the packet queues if the size is above a certain threshold.

This is very useful to figure out when huge amount of memory is consumed due to pending packets.

Currently the sampling has a lot of overhead since the value needs to be deserialized. That is why this plugin is disabled by default.

Field Summary

Fields

Modifier and Type	Field and Description
static HazelcastProperty	PERIOD_SECONDS The period in seconds this plugin runs.
static HazelcastProperty	SAMPLES The number of samples to take from a single overloaded connection.
static HazelcastProperty	THRESHOLD The minimum number of packets in the connection before it is considered to be overloaded.

Fields inherited from class com.hazelcast.internal.diagnostics.DiagnosticsPlugin

logger

Constructor Summary

Constructors

Constructor and Description
OverloadedConnectionsPlugin(NodeEngineImpl nodeEngine)

Method Summary

Modifier and Type	Method and Description
long	getPeriodMillis() Returns the period of executing the monitor in millis.
void	onStart()
void	run(DiagnosticsLogWriter writer)

Methods inherited from class java.lang.Object

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

Field Detail

PERIOD_SECONDS

public static final HazelcastProperty PERIOD_SECONDS

The period in seconds this plugin runs.

With the OverloadedConnectionsPlugin one can see what is going on inside a connection with a huge number of pending packets. It makes use of sampling to give some impression of the content.

This plugin can be very expensive to use and should only be used as a debugging aid; should not be used in production due to the fact that packets could be deserialized.

If set to 0, the plugin is disabled.

THRESHOLD

public static final HazelcastProperty THRESHOLD

The minimum number of packets in the connection before it is considered to be overloaded.

SAMPLES

public static final HazelcastProperty SAMPLES

The number of samples to take from a single overloaded connection. Increasing the number of packages gives more accuracy of the content, but it will come at greater price.

Constructor Detail

OverloadedConnectionsPlugin

public OverloadedConnectionsPlugin(NodeEngineImpl nodeEngine)

Method Detail

getPeriodMillis

public long getPeriodMillis()

Description copied from class: DiagnosticsPlugin

Returns the period of executing the monitor in millis.

If a monitor is disabled, 0 is returned.

If a monitor should run only once, a negative value is returned. This is useful for 'static' monitors like the SystemPropertiesPlugin that run at the beginning of a log file but their contents will not change.

Specified by:

getPeriodMillis in class DiagnosticsPlugin

Returns:

the period in millis.

onStart

public void onStart()

Specified by:

onStart in class DiagnosticsPlugin

run

public void run(DiagnosticsLogWriter writer)

Specified by:

run in class DiagnosticsPlugin