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From "Prachi Garg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-7408) Document WAL changes
Date Wed, 24 Jan 2018 19:37:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-7408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16338108#comment-16338108
] 

Prachi Garg commented on IGNITE-7408:
-------------------------------------

[~dmagda], Please review - [https://apacheignite.readme.io/v2.3/docs/write-ahead-log-24] ,
the section starting from " Each update is written to a buffer...", and the description for
"BACKGROUND" mode in the table.

> Document WAL changes
> --------------------
>
>                 Key: IGNITE-7408
>                 URL: https://issues.apache.org/jira/browse/IGNITE-7408
>             Project: Ignite
>          Issue Type: Task
>          Components: documentation
>            Reporter: Andrey Gura
>            Assignee: Prachi Garg
>            Priority: Major
>              Labels: documentation
>             Fix For: 2.4
>
>
> WAL documentation should be updated accordingly to IGNITE-6339 issue.
> The following changes can affect WAL configuration and behavior:
>  # {{DataStorageConfiguration.setWalBufferSize}} added instead of {{PersistentStoreConfiguration.setTlbSize}}.
By default WAL buffer size equals WAL segment size if memory mapped file is enabled, and (WAL
segment size) / 4 if memory mapped file is disabled.
>  # Memory mapped file is enabled by default and provides better performance. Memory mapped
file usage can be turned off. {{IGNITE_WAL_MMAP}} property with {{false}} value should be
added to the JVM arguments: {{-DIGNITE_WAL_MMAP=false}}.
>  # If memory mapped file is enabled then {{BACKGROUND}} and {{LOG_ONLY}} WAL modes behave
identically and don't have any differences in performance or data integrity guarantees.



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