Vladislav Pyatkov created IGNITE-19887:
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Summary: Read timstamp for standalong server node
Key: IGNITE-19887
URL: https://issues.apache.org/jira/browse/IGNITE-19887
Project: Ignite
Issue Type: Improvement
Reporter: Vladislav Pyatkov
*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)
* 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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