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GridGain 8.8.11 Release Notes

New Features

New Metrics

A large number of options were added to GridGain:

  • New metrics for tracking the number of connected thin clients with the client.connector register name.

  • New metrics for monitoring SSL connections were added to the io.communication register name.

  • A new cluster register name was added with metrics for cluster status.

  • The cache register name was extended with additional heap metrics.

You can view the updated metrics list in the Generic Metrics section.

Extended Snapshot Compression Options

New options were added to the -archive option in the snapshot management tool. You can now select between ZIP, ZSTD, LZ4, and SNAPPY compression options, or disable compression completely with a NONE option. To set a new compression option: snapshot -type=full -caches=cache1,cache2 -dest={work_folder} -archive=ZSTD
snapshot-utility.bat snapshot -type=full -caches=cache1,cache2 -dest={work_folder} -archive=ZSTD

New Option to Exclude Caches from Operation

A new excluded_caches option was added to the snapshot snapshot management tool. You can use it to exclude specific caches from the snapshot. snapshot -type=full -excluded_caches=cache1 -dest={work_folder}
snapshot-utility.bat snapshot -type=full -excluded_caches=cache1 -dest={work_folder}

Known Issues

In rare cases, an SQL entry that was added in GridGain versions 8.8.9 and earlier and updated in GridGain versions 8.8.10 and later may lead to a corrupted index. The scenario below showcases one of possible cases:

// Before 8.8.10
// Create a table with a composite PK and a secondary index.
sql("CREATE TABLE test (id1 INT, id2 INT, val INT, CONSTRAINT PK PRIMARY KEY (id1, id2)) with \"cache_name=MY_CACHE\"");
sql("CREATE index my_idx on test (val)");

// Value is inserted by using an incomplete PK (id2 is NULL by default)
sql("insert into test(id1, val) values (1,1);");

// Upgrade to 8.8.10 or later.

// After the upgrade, use the same incomplete PK key (id2 is NULL by default),
// you might end up with index inconsistency.
sql("insert into test(id1, val) values (1,2);");
// prints [[1]]
System.out.println(sql("select count(1) from test USE INDEX(\"_key_PK\")").getAll());
// prints [[2]]
System.out.println(sql("select count(1) from test USE INDEX(my_idx)").getAll());
// prints 2

Improvements and Fixed Issues

Community Edition Changes

Issue ID Category Description


Platforms & Thin Clients

.NET: Fixed potential cache startup error when one of the loaded assemblies has certain compiler-generated type names that can’t be parsed by Ignite.


GridGain Integrations

Updated Cassandra module to fix a CVE.


Cluster Metrics & Monitoring

Fixed an error with getting cache size through mbean if the cluster is inactive.


Platforms & Thin Clients

.NET: Fixed thin client streamer not creating SQL table entries.


Cluster SQL Engine

Added a check for indexed field type with a type that is used in the put operation.


Platforms & Thin Clients

.NET: Fixed thin client SslStreamFactory to allow SSL connection without client-side certificate.


Cluster Metrics & Monitoring

Extended cache metrics.


Binary Objects

Fixed a rare error with modifying binary objects that contain collections or references to objects.


Cluster Storage Engine

Fixed additional resource consuption by clearing obsolete entries.


Platforms & Thin Clients

Java thin: Fixed connection logic to follow user-defined endpoint order and try the default port first.


Cluster Metrics & Monitoring

Extended cluster topology metrics.


Platforms & Thin Clients

.NET: Fixed NullReferenceException in thin client due to late logger setter.


Cluster SQL Engine

Fixed possible assertion error when dropping a table.


Platforms & Thin Clients

Discovery statistics metrics migrated to a new framework.


Platforms & Thin Clients

Added SSL connection metrics.


Distributed Data Structures

Fixed an issue that could lead to incorrect operation of the IgniteLock after reconnecting the client node.


Cluster Storage Engine

Improved logging related to the persistent data structure message for in-memory data region.


Cluster Metrics & Monitoring

Added metrics for the number of connected thin clients.

Enterprise Edition Changes

Issue ID Category Description


Cluster Rolling Upgrade

Fixed an issue with snapshot utility not being able to capture snapshot on mixed cluster


Diagnostics and Failure Handling

Fixed NPE in snapshot operation.


Cluster Storage Engine

Fixed a consistency issue for persistent atomic caches that occured rarely when a cache remove operation was performed on an offline node.

Ultimate Edition Changes

Issue ID Category Description


Cluster Snapshot Utility

ZSTD, LZ4, SNAPPY compression options were added for snapshot operations.


Cluster Snapshot Utility

Added the -excluded_caches parameter to Cache groups can now be passed to -caches and -excluded_caches parameters.

Control Center Agent Changes

Issue ID Category Description


Control Center Agent

Fixed an error with Control Center Agent reconnecting Control Center after restart.


Control Center Agent

Reverted SSL validation for Control Center Agent.


Control Center Agent

Added support for redirects to Control Center Agent.


Control Center Agent

Extended log information for a failed connection.

Installation and Upgrade Information

See the Rolling Upgrades page for information about how to perform automated upgrades and for details about version compatibility.

Below is a list of versions that are compatible with the current version. You can rolling-upgrade from any of those. Compatibility with other versions is not guaranteed. If you are on a version that is not listed, contact GridGain for information on upgrade options.

8.7.2-p15, 8.7.3, 8.7.4, 8.7.5, 8.7.5-p1, 8.7.6, 8.7.6-p1, 8.7.7, 8.7.8, 8.7.9, 8.7.10, 8.7.11, 8.7.12, 8.7.13, 8.7.14, 8.7.15, 8.7.16, 8.7.17, 8.7.18, 8.7.19, 8.7.19-p1, 8.7.20, 8.7.21, 8.7.22, 8.7.23, 8.7.24, 8.7.25, 8.7.26, 8.7.26-p1, 8.7.27, 8.7.27-p1, 8.7.28, 8.7.29, 8.7.29-p1, 8.7.30, 8.7.31, 8.7.32, 8.7.33, 8.7.33-p2, 8.7.34, 8.7.35, 8.7.36, 8.7.37, 8.7.38, 8.7.39, 8.8.1, 8.8.2, 8.8.3, 8.8.4, 8.8.5, 8.8.6, 8.8.7, 8.8.8, 8.8.9, 8.8.10

Known Limitations

Jetty Configuration Incompatibility in GridGain 8.7.21 and Later

If you are upgrading from version 8.7.20 or earlier, consider an incompatibility issue related to Jetty configuration introduced in GridGain 8.7.21.

Your setup may be affected if:

  • You use the ignite-rest-http module (e.g. to connect to GridGain Web Console)

  • You have a custom Jetty configuration that enables SSL for REST

  • Your Jetty configuration uses the org.eclipse.jetty.util.ssl.SslContextFactory class

  • The keystore specified in the Jetty configuration contains both the CA certificate and the private certificate

In this case, after starting a new version, an exception is thrown with an error message similar to the following:

java.lang.IllegalStateException: KeyStores with multiple certificates are not supported on the base class
org.eclipse.jetty.util.ssl.SslContextFactory. (Use org.eclipse.jetty.util.ssl.SslContextFactory$Server
or org.eclipse.jetty.util.ssl.SslContextFactory$Client instead)

To workaround this issue, alter the Jetty configuration to use org.eclipse.jetty.util.ssl.SslContextFactory$Server or org.eclipse.jetty.util.ssl.SslContextFactory$Client. See the configuration example at the Client Certificate Authentication page.

Default rebalanceThreadPoolSize in GridGain 8.7.26 and Later

In GridGain 8.7.26, the default value of the property IgniteConfiguration.rebalanceThreadPoolSize changed from 1 to min(4, number of CPU / 4). It may cause a compatibility issue under the following conditions:

  • When a Rolling Upgrade is performed

  • The upgrade is performed from 8.5.7 version (or earlier) to 8.5.x or from 8.7.3 (or earlier) to 8.7.x

  • The server nodes have at least 8 CPU cores

  • The nodes configuration does not have the property IgniteConfiguration.rebalanceThreadPoolSize, so the default value is used

In this case, an exception is thrown with an error message similar to the following:

сlass org.apache.ignite.IgniteException: Rebalance configuration mismatch (fix configuration or set -DIGNITE_SKIP_CONFIGURATION_CONSISTENCY_CHECK=true system property).
Different values of such parameter may lead to rebalance process instability and hanging.  [rmtNodeId=5fc58fb7-209d-489a-8034-0127a81abed6, locRebalanceThreadPoolSize = 4, rmtRebalanceThreadPoolSize = 1]

To workaround this issue, change the configuration of the server nodes to rebalanceThreadPoolSize=1 so that it matches the previous default configuration. For example:

<bean class="org.apache.ignite.configuration.IgniteConfiguration">
    <property name="rebalanceThreadPoolSize" value="1"/>

    <!-- The rest of the configuration goes here -->

Jetty Doesn’t Accept Incorrect Configuration in GridGain 8.7.31 and Later

In GridGain 8.7.31 Jetty was upgraded to 9.4.33. Starting that version, Jetty has more strict validation of the provided configuration files. Before that version, an incorrectly spelled property in the configuration file had no effect. Starting this version, errors in the configuration will lead to an error on start.

Your setup may be affected if:

  • You use the ignite-rest-http module (e.g. to connect to GridGain Web Console)

  • You have a custom Jetty configuration for REST

  • The custom configuration has errors in it

You will need to fix the custom Jetty configuration before upgrading. No Longer Enables Remote JMX by Default in GridGain 8.7.31 and Later

Starting from 8.7.31 version, GridGain no longer attempts to automatically enable the remote JMX. Default settings are known to cause issues if customized (for example, secure the connection). Also, in most cases, remote JMX is not required since many tools use local JMX connections (not using TCP).

Your setup may be affected if:

  • You start GridGain nodes via script

  • You connect to GridGain nodes' JMX interface remotely over TCP using the default configuration

To continue using remote JMX, you need to manually specify the required JMX settings. Please see the example below. Note that you don’t need remote JMX if you use a local connection, such as connecting JConsole to a GridGain process on the same host.

export JVM_OPTS=" \"


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