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MXS-2300: Add session command pruning

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This commit adds a new parameter that, when enabled, prunes the session
command history to a known length. This makes it possible to keep a
client-side pooled connection open indefinitely at the cost of making
reconnections theoretically unsafe. In practice the maximum history length
can be set to a value that encompasses a single session using the pooled
connection with no risk to session state integrity. The default history
length of 50 commands is quite likely to be adequate for the majority of
use-cases.
This commit is contained in:
Markus Mäkelä
2019-01-30 09:14:13 +02:00
parent bf4aa1ab2c
commit 260ce9b8b8
5 changed files with 66 additions and 12 deletions
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2
server/modules/routing/readwritesplit/readwritesplit.hh
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@ -151,6 +151,7 @@ struct Config
(enum failure_mode)config_get_enum(
params, "master_failure_mode", master_failure_mode_values))
, max_sescmd_history(config_get_integer(params, "max_sescmd_history"))
, prune_sescmd_history(config_get_bool(params, "prune_sescmd_history"))
, disable_sescmd_history(config_get_bool(params, "disable_sescmd_history"))
, master_accept_reads(config_get_bool(params, "master_accept_reads"))
, strict_multi_stmt(config_get_bool(params, "strict_multi_stmt"))
@ -205,6 +206,7 @@ struct Config
* master or all nodes */
failure_mode master_failure_mode; /**< Master server failure handling mode */
uint64_t max_sescmd_history; /**< Maximum amount of session commands to store */
bool prune_sescmd_history; /**< Prune session command history */
bool disable_sescmd_history;/**< Disable session command history */
bool master_accept_reads; /**< Use master for reads */
bool strict_multi_stmt; /**< Force non-multistatement queries to be routed to