Pavel Pereslegin created IGNITE-22975:
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Summary: Catalog compaction. Improve minimum tx begin time
computation
Key: IGNITE-22975
URL: https://issues.apache.org/jira/browse/IGNITE-22975
Project: Ignite
Issue Type: Improvement
Reporter: Pavel Pereslegin
Currently minimum begin time among all transactions started locally computes
under write lock.
{code:java}
@Override
public HybridTimestamp minimumBeginTime(Supplier<HybridTimestamp>
defaultBeginTime) {
readWriteLock.writeLock().lock();
try {
return txCatalogVersionByBeginTxTs.keySet().stream()
.min(HybridTimestamp::compareTo)
.orElse(defaultBeginTime.get());
} finally {
readWriteLock.writeLock().unlock();
}
}
{code}
This code blocks the start of transactions and can be optimized.
Need to investigate possible ways to optimize it.
* may be we can somehow use existing ordered map {{txCountByCatalogVersion}} to
provide minimum require catalog version instead of tx begin time and
rework/remove {{ActiveLocalTxMinimumBeginTimeProvider}}.
* may be we can ignore defaultBeginTime supplier and not update this timestamp
when there are no active RW transactions.
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