[jira] [Created] (GEODE-8953) User Guide - re-introduce transaction details regarding non-transactional changes

["Dave Barnes (Jira)" <ji...@apache.org>]

Dave Barnes created GEODE-8953:
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             Summary: User Guide - re-introduce transaction details regarding non-transactional changes
                 Key: GEODE-8953
                 URL: https://issues.apache.org/jira/browse/GEODE-8953
             Project: Geode
          Issue Type: Bug
          Components: docs
            Reporter: Dave Barnes


Community member @alberto.gomez requests that we re-introduce some verbiage that was deleted in the fix for "GEODE-5509: Rewrite the docs on transaction."

The passage to re-instate is:
"If other, non-transactional sources update the keys the transaction is modifying, the changes may intermingle with this transaction’s changes. The other sources can include distributions from remote members, loading activities, and other direct cache modification calls from the same member. When this happens, after your commit finishes, the cache state may not be what you expected."

[~eshu] concurs, providing the background explanation:
To achieve best performance, non-transactional operations do not acquire DLock used to check conflicts in a transaction. So transaction will not be able to detect the conflict caused by a non transactional operation. It is expected that user application always uses transaction or no transaction at all, unless user knows that certain regions or set of entries will not be modified by operations outside of a transaction.



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