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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: None
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Storage Engines 2018-09-24, Storage Engines 2018-10-08
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1
In order to support long running prepared transactions, we allow pages with prepared updates to be evicted. To support that, we need to know the key when resolving a prepared transaction to find the update in the lookaside file again.
We recently introduced code to always copy the key when populating a WT_TXN_OP structure - that adds a performance penalty for transactions that never prepare, since their updates can't be evicted.
We should investigate paths to avoid the copy in the common case.
