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Fix variable and type name in comment.
Kyotaro Horiguchi Discussion: https://www.postgresql.org/message-id/20170711.163441.241981736.horiguchi.kyotaro@lab.ntt.co.jp
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@ -549,14 +549,14 @@ StandbyTimeoutHandler(void)
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* one transaction on one relation, and don't worry about lock queuing.
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*
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* We keep a single dynamically expandible list of locks in local memory,
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* RelationLockList, so we can keep track of the various entries made by
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* RecoveryLockList, so we can keep track of the various entries made by
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* the Startup process's virtual xid in the shared lock table.
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*
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* We record the lock against the top-level xid, rather than individual
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* subtransaction xids. This means AccessExclusiveLocks held by aborted
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* subtransactions are not released as early as possible on standbys.
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*
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* List elements use type xl_rel_lock, since the WAL record type exactly
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* List elements use type xl_standby_lock, since the WAL record type exactly
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* matches the information that we need to keep track of.
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*
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* We use session locks rather than normal locks so we don't need
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