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From "Andrey Gura (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-7408) Document WAL changes
Date Mon, 15 Jan 2018 09:49:00 GMT
Andrey Gura created IGNITE-7408:

             Summary: Document WAL changes
                 Key: IGNITE-7408
                 URL: https://issues.apache.org/jira/browse/IGNITE-7408
             Project: Ignite
          Issue Type: Task
         Environment: 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.
            Reporter: Andrey Gura
             Fix For: 2.4

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