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Enable query_retries by default

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Enabling it with a value of 1 should remove the vast majority of
connection related problems that appear in MaxScale. This should filter
out most of the errors caused by transient network problems.
This commit is contained in:
Markus Mäkelä
2018-08-04 04:47:41 +03:00
parent 0795d60007
commit 376cd3aa9e
3 changed files with 11 additions and 3 deletions
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5
Documentation/Getting-Started/Configuration-Guide.md
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@ -209,8 +209,9 @@ auth_write_timeout=10
#### `query_retries` #### `query_retries`
The number of times an interrupted internal query will be retried. This feature The number of times an interrupted internal query will be retried. The default
was added in MaxScale 2.1.10 and is disabled by default. is to retry the query once. This feature was added in MaxScale 2.1.10 and was
disabled by default until MaxScale 2.3.0.
An interrupted query is any query that is interrupted by a network An interrupted query is any query that is interrupted by a network
error. Connection timeouts are included in network errors and thus is it error. Connection timeouts are included in network errors and thus is it

7
Documentation/Release-Notes/MaxScale-2.3.0-Release-Notes.md
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@ -10,6 +10,13 @@ report at [Jira](https://jira.mariadb.org).
## Changed Features ## Changed Features
### `query_retries`
The default value of `query_retries` was changed from 0 to 1. This turns
on failure tolerant queries for monitors and authenticators which prevents
failures due to network problems. A single reconnection attempt is made to
keep responsiveness high even with default values.
### Session Command History ### Session Command History
The _readwritesplit_ session command history is now enabled mby default but it The _readwritesplit_ session command history is now enabled mby default but it

2
server/core/internal/config.hh
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@ -24,7 +24,7 @@
#define DEFAULT_NBPOLLS 3 /**< Default number of non block polls before we block */ #define DEFAULT_NBPOLLS 3 /**< Default number of non block polls before we block */
#define DEFAULT_POLLSLEEP 1000 /**< Default poll wait time (milliseconds) */ #define DEFAULT_POLLSLEEP 1000 /**< Default poll wait time (milliseconds) */
#define DEFAULT_NTHREADS 1 /**< Default number of polling threads */ #define DEFAULT_NTHREADS 1 /**< Default number of polling threads */
#define DEFAULT_QUERY_RETRIES 0 /**< Number of retries for interrupted queries */ #define DEFAULT_QUERY_RETRIES 1 /**< Number of retries for interrupted queries */
#define DEFAULT_QUERY_RETRY_TIMEOUT 5 /**< Timeout for query retries */ #define DEFAULT_QUERY_RETRY_TIMEOUT 5 /**< Timeout for query retries */
#define MIN_WRITEQ_HIGH_WATER 4096 /**< Min high water mark of dcb write queue */ #define MIN_WRITEQ_HIGH_WATER 4096 /**< Min high water mark of dcb write queue */
#define MIN_WRITEQ_LOW_WATER 512 /**< Min low water mark of dcb write queue */ #define MIN_WRITEQ_LOW_WATER 512 /**< Min low water mark of dcb write queue */