[jira] [Created] (IGNITE-8536) DirectMemoryRegion: Introduce checkpoint buffer configuration and improve logging o start

[Anton Vinogradov (Jira)]

Alexey Kuznetsov created IGNITE-8536:
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             Summary: DirectMemoryRegion: Introduce checkpoint buffer  configuration and improve logging o start
                 Key: IGNITE-8536
                 URL: https://issues.apache.org/jira/browse/IGNITE-8536
             Project: Ignite
          Issue Type: Improvement
          Components: persistence
    Affects Versions: 2.4
            Reporter: Alexey Kuznetsov
            Assignee: Alexey Goncharuk


We need to configure data region checkpoint buffer size when we start Ignite on computer with  limiter resources, for example AWS t2.micro

In current implementation Ignite will allocate 100Mb buffers, it should be configurable.

Also we need to improve message printed in log:
current message:
{code}
[2018-05-18T03:43:01,449][INFO ][exchange-worker-#51][PageMemoryImpl] Started page memory [memoryAllocated=100.0 MiB, pages=24937, tableSize=1.4 MiB, checkpointBuffer=100.0 MiB]
{code}

Lets add region name and rename "checkpointBuffer" to  "data region buffer".




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