WARNING: Version 1.6 of Elasticsearch has passed its EOL date.
This documentation is no longer being maintained and may be removed. If you are running this version, we strongly advise you to upgrade. For the latest information, see the current release documentation.
Index Slow Log
editIndex Slow Log
editSearch Slow Log
editShard level slow search log allows to log slow search (query and fetch executions) into a dedicated log file.
Thresholds can be set for both the query phase of the execution, and fetch phase, here is a sample:
#index.search.slowlog.threshold.query.warn: 10s #index.search.slowlog.threshold.query.info: 5s #index.search.slowlog.threshold.query.debug: 2s #index.search.slowlog.threshold.query.trace: 500ms #index.search.slowlog.threshold.fetch.warn: 1s #index.search.slowlog.threshold.fetch.info: 800ms #index.search.slowlog.threshold.fetch.debug: 500ms #index.search.slowlog.threshold.fetch.trace: 200ms
By default, none are enabled (set to -1
). Levels (warn
, info
,
debug
, trace
) allow to control under which logging level the log
will be logged. Not all are required to be configured (for example, only
warn
threshold can be set). The benefit of several levels is the
ability to quickly "grep" for specific thresholds breached.
The logging is done on the shard level scope, meaning the execution of a search request within a specific shard. It does not encompass the whole search request, which can be broadcast to several shards in order to execute. Some of the benefits of shard level logging is the association of the actual execution on the specific machine, compared with request level.
All settings are index level settings (and each index can have different values for it), and can be changed in runtime using the index update settings API.
The logging file is configured by default using the following
configuration (found in logging.yml
):
index_search_slow_log_file: type: dailyRollingFile file: ${path.logs}/${cluster.name}_index_search_slowlog.log datePattern: "'.'yyyy-MM-dd" layout: type: pattern conversionPattern: "[%d{ISO8601}][%-5p][%-25c] %m%n"
Index Slow log
editThe indexing slow log, similar in functionality to the search slow
log. The log file is ends with _index_indexing_slowlog.log
. Log and
the thresholds are configured in the elasticsearch.yml file in the same
way as the search slowlog. Index slowlog sample:
#index.indexing.slowlog.threshold.index.warn: 10s #index.indexing.slowlog.threshold.index.info: 5s #index.indexing.slowlog.threshold.index.debug: 2s #index.indexing.slowlog.threshold.index.trace: 500ms
The index slow log file is configured by default in the logging.yml
file:
index_indexing_slow_log_file: type: dailyRollingFile file: ${path.logs}/${cluster.name}_index_indexing_slowlog.log datePattern: "'.'yyyy-MM-dd" layout: type: pattern conversionPattern: "[%d{ISO8601}][%-5p][%-25c] %m%n"