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Joshua
wendelin.core
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1bbd6215
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1bbd6215
authored
Dec 11, 2019
by
Kirill Smelkov
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zloadrace.py
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1bbd6215
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@@ -20,6 +20,20 @@ and later again by https://github.com/zopefoundation/ZEO/commit/94f275c3 .
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@@ -20,6 +20,20 @@ and later again by https://github.com/zopefoundation/ZEO/commit/94f275c3 .
NEO
NEO
---
---
There is no load vs invalidation race on NEO but the protection is implicit:
- client app maintains .last_tid which is updated by poller thread upon
receiving invalidations.
- when load() is called without specifing @head (the case we are considering),
it uses .last_tid for @at with which to ask storage node.
- even if client.load() observes .last_tid which was updated for simultaneously
committed transaction and not yet invalidated cache the following happens:
* client sends AskObject packet to a storage node.
* ask _locks_ corresponding connection to the storage. XXX _not_ to master from which we should have received invalidation message !
- client.app.load
XXX load vs invalidation race is there on ZODB4 and ZODB3, but on ZODB5 there is
XXX load vs invalidation race is there on ZODB4 and ZODB3, but on ZODB5 there is
another open vs invalidation race.
another open vs invalidation race.
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