[PATCH v3 0/5] Delete old WAL files if running out of disk space

[Vladimir Davydov]

On Wed, Oct 24, 2018 at 04:43:12PM +0300, Vladimir Davydov wrote:
> Vladimir Davydov (5):
>   wal: preallocate disk space before writing rows
>   wal: pass wal_watcher_msg to wal_watcher callback
>   wal: rename wal_watcher->events to pending_events
>   wal: add event_mask to wal_watcher
>   wal: delete old wal files when running out of disk space

Discussed verbally with Kostja. Agreed that even though there are some
concerns regarding the watcher API re-usability and efficiency, we shall
push it as is now and rework it later if we need to.

I added a comment to patch #4 (see below) and pushed all the patches to
1.10-features.

+/**
+ * Notify all interested watchers about a WAL event.
+ *
+ * XXX: Note, this function iterates over all registered watchers,
+ * including those that are not interested in the given event.
+ * This is OK only as long as the number of events/watchers is
+ * small. If this ever changes, we should consider maintaining
+ * a separate watcher list per each event type.
+ */
 static void
 wal_notify_watchers(struct wal_writer *writer, unsigned events)