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repmgr: only require 'wal_keep_segments' to be set in certain corner cases

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Now that repmgr uses pg_basebackup's `--xlog-method=stream` setting by
default, and enables provision of `restore_command`, there's no reason
to require `wal_keep_segments` to be set in the default use-case.

`repmgr standby clone` will now only fail with an error if `wal_keep_segments`
is zero and one of the following cases applies:

* `--rsync-only` clone with no `restore_command` set
* clone with pg_basebackup and `--xlog-method=fetch`
* -w/--wal-keep-segments specified on the command line

If, for whatever reason, it's necessary to perform a standby clone
with `wal_keep_segments=0` in one of the above cases, specifying
`-w/--wal-keep-segments=0` on the command line will effectively
override the check.

GitHub #204
This commit is contained in:
Ian Barwick
2016-09-21 16:42:14 +09:00
parent 5090b8cab1
commit 114c1bddcb
3 changed files with 72 additions and 37 deletions
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2
repmgr.h
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@@ -36,7 +36,7 @@
#define ERRBUFF_SIZE 512
#define DEFAULT_WAL_KEEP_SEGMENTS "5000"
#define DEFAULT_WAL_KEEP_SEGMENTS "0"
#define DEFAULT_DEST_DIR "."
#define DEFAULT_REPMGR_SCHEMA_PREFIX "repmgr_"
#define DEFAULT_PRIORITY 100