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Botond Dénes 436b305286 view_update_generator: fix race between registering and processing sstables

fea83f6 introduced a race between processing (and hence removing)
sstables from `_sstables_with_tables` and registering new ones. This
manifested in sstables that were added concurrently with processing a
batch for the same sstables being dropped and the semaphore units
associated with them not returned. This resulted in repairs being
blocked indefinitely as the units of the semaphore were effectively
leaked.

This patch fixes this by moving the contents of `_sstables_with_tables`
to a local variable before starting the processing. A unit test
reproducing the problem is also added.

Fixes: #6892

Tests: unit(dev)
Signed-off-by: Botond Dénes <bdenes@scylladb.com>
Message-Id: <20200817160913.2296444-1-bdenes@scylladb.com>
(cherry picked from commit 22a6493716)

2020-08-23 18:04:29 +03:00

build_progress_virtual_reader.hh

header: De-bloat schema.hh

2020-03-03 11:34:00 +01:00

node_view_update_backlog.hh

db/view: Introduce node_update_backlog class

2018-12-19 22:38:30 +00:00

row_locking.cc

db: add row locking metrics

2018-05-22 16:52:58 +02:00

row_locking.hh

header: De-bloat schema.hh