GridGain 9.1.6 Release Notes

GridGain 9.1.6 adds a Python client and extended bootstrap configuration support, along with various SQL, storage, and client fixes.

Overview

GridGain 9.1.6 is a release with multiple minor improvements, including better backward compatibility support for bootstrap configuration, a new Python 3 client, extended distributed map configuration options, and various bug fixes across SQL, storage, and platform clients.

Major Changes

Extended Bootstrap Support

This release features extended backwards compatibility support for bootstrap configuration. You can now configure your compose files in the same way as you did in GridGain 9.1.4 and earlier with a minor update. Bootstrap configuration from 9.1.5 is also temporarily supported to allow for fluid migration to later versions.

To migrate from your earlier docker compose configurations, add a BOOTSTRAP_NODE_CONFIG environment variable to your configuration like that points to where the configuration file is stored in the container.

The example below shows how to do this:

x-gridgain-def: &gridgain-def
  image: gridgain/gridgain9:9.1.6
  environment:
    BOOTSTRAP_NODE_CONFIG: /opt/gridgain/etc/gridgain-config.conf # Uses the configuration file to start GridGain 9.
  configs:
    - source: node_config
      target: /opt/gridgain/etc/gridgain-config.conf # Stores the configuration file defined elsewhere in node_config element in the compose file.
      mode: 0644

In the example above, BOOTSTRAP_NODE_CONFIG environment variable is set up to use the configuration file defined in the compose file.

New Features

Python Client

This release brings the first version of the Python client. The client API is experimental and may change in subsequent releases. Currently, the Python client is exclusively dedicated to working with distributed maps.

You can install the python client from pip by installing pygridgain of version 9 or later:

pip install pygridgain>=9

The following example demonstrates how you can use the client to create a map, add a value to it, and get it back:

async with AsyncClient(address) as client:
    await client.connect()
    print("client connected")
    binary_map = await client.structures().get_or_create_binary_map('myMap')
    await binary_map.put(b'1', b'Hello World')
    value_exists = await binary_map.contains(b'1')
    print(f"Does 1 exist on the cluster: {value_exists}")
    print(await binary_map.get(b'1'))

For more information about Python client, see client documentation.

Improvements and Fixed Issues

Issue ID	Category	Description
IGN-28521	Cluster Storage Engine	Node configuration file is no longer updated on node start.
IGN-28375	General	The changes in ignite.gc.lowWatermark.updateIntervalMillis configuration are now applied immediately.
IGN-28366	General	Fixed a possible deadlock during data rebalancing when a node leaves under heavy load and returns to the cluster after a long time.
IGN-28346	Cluster SQL Engine	Fixed an ArrayIndexOutOfBounds exception that happened when merge operation included JOINs.
IGN-28270	General	Nodes now export some metrics to the log by default.
IGN-28113	Cluster SQL Engine	Fixed an issue that caused time values to be incorrectly trimmed when converted to string via getString method of JDBC ResultSet.
IGN-28044	SQL	TIME and TIMESTAMP data types conversion now correctly accounts for required precision.
IGN-27950	General	Nodes now reliably destroy dropped tables after restart.
IGN-27917	SQL	Added CURRENT_USER SQL function.
IGN-27821	Platforms and Clients	C++ client: Added support for configuring transaction timeouts.
IGN-26455	Distributed Computing	Added new compute task events.
GG-44621	Cluster Storage Engine	Fixed data inconsistency issues when using columnar storage in Docker.
GG-44404	General	Fixed NullPointerException when logging address binding error for data center replication.
GG-44379	Builds and Deliveries	Added -XX:+PerfDisableSharedMem JVM parameter to bootstrap configuration to improve performance in certain scenarios.
GG-44340	Cluster Storage Engine	Fixed a rare scenario where select with projection could fail.
GG-44188	Cluster Continuous Queries	.NET client can now handle CQ events coming after table dropped.
GG-44170	Distributed Data Structures	You can now specify the non-standard storage engine for distributed maps.
GG-44169	Distributed Data Structures	You can now specify the distribution zone the distributed map will be stored at.
GG-43851	Platforms & Clients	Added Python 3 client.
GG-42333	Builds and Deliveries	Added Linux ARM64 support for Columnar store.

Upgrade Information

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

9.1.0, 9.1.1, 9.1.2, 9.1.3, 9.1.4, 9.1.5

Known Limitations

Data Restoration After Data Rebalance

Currently, data rebalance may cause partition distribution to change and cause issues with snapshots and data recovery. In particular:

• It is currently not possible to restore a LOCAL snapshot if data rebalance happened after snapshot creation. This will be addressed in one of the upcoming releases.

• It is currently not possible to perform point-in-time recovery if data rebalance happened after table creation. This will be addressed in one of the upcoming releases.

SQL Performance in Complex Scenarios

There are known issues with the performance of SQL read-write transactions in complex read-write scenarios. These issues will be addressed in an upcoming releases.

We Value Your Feedback

Your comments and suggestions are always welcome. You can reach us here: http://support.gridgain.com/.