postgresql/src/test/isolation/isolation_schedule
Michael Paquier a556549d7e Improve VACUUM and ANALYZE by avoiding early lock queue
A caller of VACUUM can perform early lookup obtention which can cause
other sessions to block on the request done, causing potentially DOS
attacks as even a non-privileged user can attempt a vacuum fill of a
critical catalog table to block even all incoming connection attempts.

Contrary to TRUNCATE, a client could attempt a system-wide VACUUM after
building the list of relations to VACUUM, which can cause vacuum_rel()
or analyze_rel() to try to lock the relation but the operation would
just block.  When the client specifies a list of relations and the
relation needs to be skipped, ownership checks are done when building
the list of relations to work on, preventing a later lock attempt.

vacuum_rel() already had the sanity checks needed, except that those
were applied too late.  This commit refactors the code so as relation
skips are checked beforehand, making it safer to avoid too early locks,
for both manual VACUUM with and without a list of relations specified.

An isolation test is added emulating the fact that early locks do not
happen anymore, issuing a WARNING message earlier if the user calling
VACUUM is not a relation owner.

When a partitioned table is listed in a manual VACUUM or ANALYZE
command, its full list of partitions is fetched, all partitions get
added to the list to work on, and then each one of them is processed one
by one, with ownership checks happening at the later phase of
vacuum_rel() or analyze_rel().  Trying to do early ownership checks for
each partition is proving to be tedious as this would result in deadlock
risks with lock upgrades, and skipping all partitions if the listed
partitioned table is not owned would result in a behavior change
compared to how Postgres 10 has implemented vacuum for partitioned
tables.  The original problem reported related to early lock queue for
critical relations is fixed anyway, so priority is given to avoiding a
backward-incompatible behavior.

Reported-by: Lloyd Albin, Jeremy Schneider
Author: Michael Paquier
Reviewed by: Nathan Bossart, Kyotaro Horiguchi
Discussion: https://postgr.es/m/152512087100.19803.12733865831237526317@wrigleys.postgresql.org
Discussion: https://postgr.es/m/20180812222142.GA6097@paquier.xyz
2018-08-27 09:11:12 +09:00

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test: read-only-anomaly
test: read-only-anomaly-2
test: read-only-anomaly-3
test: read-write-unique
test: read-write-unique-2
test: read-write-unique-3
test: read-write-unique-4
test: simple-write-skew
test: receipt-report
test: temporal-range-integrity
test: project-manager
test: classroom-scheduling
test: total-cash
test: referential-integrity
test: ri-trigger
test: partial-index
test: two-ids
test: multiple-row-versions
test: index-only-scan
test: deadlock-simple
test: deadlock-hard
test: deadlock-soft
test: deadlock-soft-2
test: fk-contention
test: fk-deadlock
test: fk-deadlock2
test: eval-plan-qual
test: lock-update-delete
test: lock-update-traversal
test: insert-conflict-do-nothing
test: insert-conflict-do-nothing-2
test: insert-conflict-do-update
test: insert-conflict-do-update-2
test: insert-conflict-do-update-3
test: insert-conflict-toast
test: delete-abort-savept
test: delete-abort-savept-2
test: aborted-keyrevoke
test: multixact-no-deadlock
test: multixact-no-forget
test: lock-committed-update
test: lock-committed-keyupdate
test: update-locked-tuple
test: propagate-lock-delete
test: tuplelock-conflict
test: tuplelock-update
test: freeze-the-dead
test: nowait
test: nowait-2
test: nowait-3
test: nowait-4
test: nowait-5
test: skip-locked
test: skip-locked-2
test: skip-locked-3
test: skip-locked-4
test: drop-index-concurrently-1
test: multiple-cic
test: alter-table-1
test: alter-table-2
test: alter-table-3
test: alter-table-4
test: create-trigger
test: sequence-ddl
test: async-notify
test: vacuum-reltuples
test: timeouts
test: vacuum-concurrent-drop
test: vacuum-conflict
test: predicate-hash
test: predicate-gist
test: predicate-gin
test: predicate-gin-fastupdate
test: predicate-gin-nomatch
test: partition-key-update-1
test: partition-key-update-2
test: partition-key-update-3
test: partition-key-update-4
test: plpgsql-toast
test: truncate-conflict