hcq/MaxScale
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

MXS-2363 Implement /v1/maxscale/query_classifier/cache

Browse Source 
That URL will now return information about the statements in
the query classifier cache. The information is collected using
the same map in a serial manner from all routing workers (that
each have their own cache). Since all caches will contains the
same statements, collecting the information in a serial manner
means that the overall memory consumption will be lower than
what it would be if the information was collected in parallel.
This commit is contained in:
Johan Wikman
2019-03-27 16:32:55 +02:00
parent 64a0327ada
commit 5f5d2ef183
4 changed files with 172 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
include/maxscale/query_classifier.hh
View File

@ -12,6 +12,7 @@
*/
#pragma once
#include <map>
#include <maxscale/ccdefs.hh>
#include <maxbase/jansson.h>
#include <maxscale/buffer.hh>
@ -172,6 +173,17 @@ struct QC_STMT_INFO
{
};
/**
* QC_STMT_RESULT contains limited information about a particular
* statement.
*/
struct QC_STMT_RESULT
{
qc_parse_result_t status;
uint32_t type_mask;
qc_query_op_t op;
};
/**
* QUERY_CLASSIFIER defines the object a query classifier plugin must
* implement and return.
@ -439,6 +451,15 @@ struct QUERY_CLASSIFIER
* @param info The info to be closed.
*/
void (* qc_info_close)(QC_STMT_INFO* info);
/**
* Get result from info.
*
* @param The info whose result should be returned.
*
* @return The result of the provided info.
*/
QC_STMT_RESULT (*qc_get_result_from_info)(const QC_STMT_INFO* info);
};
/**
@ -949,3 +970,23 @@ json_t* qc_get_cache_stats_as_json();
* @return The corresponding string.
*/
const char* qc_result_to_string(qc_parse_result_t result);
/**
* Public interface to query classifier cache state.
*/
struct QC_CACHE_ENTRY
{
int64_t hits;
QC_STMT_RESULT result;
};
/**
* Obtain query classifier cache information for the @b calling thread.
*
* @param state Map where information is added.
*
* @note Calling with a non-empty @c state means that a cumulative result
* will be obtained, that is, the hits of a particular key will
* be added the hits of that key if it already is in the map.
*/
void qc_get_cache_state(std::map<std::string, QC_CACHE_ENTRY>& state);