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https://issues.apache.org/jira/browse/IGNITE-19887?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pavel Tupitsyn updated IGNITE-19887:
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Summary: Add internal API to pass read timestamp to read-only transaction
(was: Add API to get read timestamp for standalone server node)
> Add internal API to pass read timestamp to read-only transaction
> ----------------------------------------------------------------
>
> Key: IGNITE-19887
> URL: https://issues.apache.org/jira/browse/IGNITE-19887
> Project: Ignite
> Issue Type: Improvement
> Reporter: Vladislav Pyatkov
> Priority: Major
> Labels: ignite-3
>
> *Motivation*
> RO transaction has timestamp which determine a moment when data will be read.
> To avoid waiting, safe time is supposed to provide the timestamp in the past.
> The timestamp is determined by the last committed transaction on this server
> in order to be available to retrieve all data which is locally fixed.
> *Implementation notes*
> * The last commit timestamp should save and update in {{TxManagerImpl}}
> during any transaction committed.
> * Read timestamp is determined as {{max(lastCommitTimestamp, now() -
> safeTimePropagationFrequency)}} by default
> * Add a new method to start read only transaction with specific timestamp:
> {code}
> /**
> * Starts a readonly transaction with specific timestamp.
> *
> * @param readTimestamp Read timestamp.
> * @return Reade only transaction.
> */
> public ReadOnlyTransactionImpl begin(HybridTimestamp readTimestamp)
> {code}
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