DEVNOTEX.txt also contains mentioning of jdk7:

```
Ignite Hadoop Accelerator Maven Build Instructions
...
2) Assembly Hadoop Accelerator:
...
   NOTE: JDK version should be 1.7.0-* or >= 1.8.0-u40.
```

В Ср, 07/03/2018 в 07:25 +0300, Nikolay Izhikov пишет:
> Hello, Vladimir.
> 
> I'm looked into 
> 
> apache-ignite-hadoop-2.4.0-bin.zip/HADOOP_README.txt
> 
> It contains:
> 
> ```
> Installation requirements:
> 
> 1. Windows, Linux, or MacOS environment.
> 2. Java 7 or 8 (latest update is advisable).
> ```
> 
> Seems, it has to be updated because Java 7 is not supported in 2.4
> 
> 
> В Пн, 05/03/2018 в 22:42 +0300, Vladimir Ozerov пишет:
> >  Igniters,
> > 
> > We have uploaded a 2.4.0 release candidate to
> > https://dist.apache.org/repos/dist/dev/ignite/2.4.0-rc1/
> > 
> > Git tag name is
> > 2.4.0-rc1
> > 
> > This release includes the following changes:
> > 
> > Ignite:
> > * Introduced Baseline Affinity Topology
> > * Ability to disable WAL for cache in runtime through IgniteCluster API or
> > ALTER TABLE command
> > * Added ability to convert WAL to human-readable form
> > * Ability to enable/disable JDBC, ODBC and thin client endpoints
> > * Project moved to Java 8
> > * Java 7 is no longer supported
> > * Apache Ignite can be run on Java 9
> > * Introduced Apache Ignite packaging with RPM
> > * Spark Data Frames support
> > * Added integration with Spring 3.x
> > * Added handler to stop node when IO error is encountered
> > * EvictionPolicyFactory support added to CacheConfiguration
> > * Added JMX metrics for memory regions
> > * Added detailed memory consumption on start and OOM reporting
> > * Added custom thread pools monitoring
> > * Support Ignite MR in Kerberized environment without IGFS
> > * S3 IP finder: support server side encryption and bucket endpoint
> > configuration
> > * Multiple fixes and performance optimizations
> > 
> > Ignite.NET:
> > * Thin Client initial release
> > * .NET Core / Linux / macOS support
> > * Mono platform support
> > * Removed C++ JNI layer
> > 
> > SQL:
> > * Added DEFAULT support to CREATE TABLE command
> > * Added ALTER TABLE DROP COLUMN support
> > * Added INLINE_SIZE option to CREATE INDEX command
> > * Added PARALLEL option to CREATE INDEX command
> > * Added optional on-heap row cache
> > * INSERT command now can be executed without explicit column names (INSERT
> > INTO table VALUES ...)
> > * Allowed multiple caches to share the same schema
> > * Added support for Java 8 Date and Time API
> > * Added "notNull" property to QuerySqlField annotation
> > * Improved COUNT(*) performance
> > * Fixed a problem causing an exception in certain nodes do not have primary
> > partitions for REPLICATED cache
> > * Fixed per-thread H2 connection leak.
> > * Fixed partition exchange hang due to SQL query running inside a
> > transaction.
> > 
> > JDBC Driver:
> > * Optimized batched operations processing
> > 
> > ODBC Driver:
> > * Added support of multiple statements execution with one call
> > * Added support of SQL_ATTR_CONNECTION_TIMEOUT
> > * Added support of SQL_ATTR_QUERY_TIMEOUT
> > * Optimized batched operations processing
> > * Proper handling of ungraceful TCP disconnects (keep-alive connection)
> > * Fixed error preventing close of executed DML statement
> > * Fixed table names returned by SQLTables for DDL-created tables
> > 
> > Machine Learning:
> > * Implemented Fuzzy c-means algorithm
> > * Implemented gradient descent for OLS Linear Regression
> > * Implemented K nearest neighbor algorithm
> > * Introduced API for datasets
> > * Introduced API for ML model and trainers
> > * Introduced common mechanism for group training of models
> > * Added distributed version of multilayer perceptron
> > * Added local version of multilayer perceptron
> > * Added basic import/export functionality for ml models
> > * Added decision tree algorithm
> > * Performance optimizations for distributed operations
> > 
> > Web Console:
> > * Implemented component for cluster selection and activation
> > * Implemented support for multiple statements on Queries screen
> > * Implemented progress indication for 'execute', 'scan' and 'export'
> > actions on Queries screen
> > * Added support for ClientConnectorConfiguration
> > * Added several SQL examples on Queries screen
> > * Added "Connected clusters" component in header
> > * Added support for custom SMTP server configuration
> > * Added detection of CSV separator based on browser locale
> > * Added "Copy to clipboard" action on Queries screen
> > * Added duration and node ID in results header and 'Show query' modal
> > * Improved support for binary JDBC types on import from RDBMS
> > * Fixed Web Console under IE11
> > * Fixed configuration generation for imported model in case of Oracle
> > NUMBER(5) data type
> > * Fixed output of big numbers in SQL query results
> > 
> > Visor:
> > * Added "-quiet" flag for batch mode
> > * Added ability to start cache rebalance
> > * Added output of data region metrics to "node" command
> > * Added dialog to put/get/remove values to/from cache for simple key types
> > * Show valid message for caches when cluster is inactive
> > * Fixed 'cache -a' in case of node filter
> > * Fixed reading last command line in batch mode
> > * Updated eviction policy factory in configs
> > 
> > Complete list of closed issues:
> > https://issues.apache.org/jira/issues/?jql=project%20%3D%20IGNITE%20AND%20fixVersion%20%3D%202.4%20AND%20(status%20%3D%20closed%20or%20status%20%3D%20resolved)
> > 
> > DEVNOTES
> > https://git-wip-us.apache.org/repos/asf?p=ignite.git;a=blob_plain;f=DEVNOTES.txt;hb=refs/tags/2.4.0-rc1
> > 
> > RELEASE NOTES
> > https://git-wip-us.apache.org/repos/asf?p=ignite.git;a=blob_plain;f=RELEASE_NOTES.txt;hb=refs/tags/2.4.0-rc1
> > 
> > Please start voting.
> > 
> > +1 - to accept Apache Ignite 2.4.0-RC1
> > 0 - don't care either way
> > -1 - DO NOT accept Apache Ignite 2.4.0-RC1 (explain why)
> > 
> > This vote will go for 72 hours.
> > 
> > Vladimir.

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