In SkyWalking, there are two types of observability data, besides metadata.
You have following settings for different types.
# Set a timeout on metrics data. After the timeout has expired, the metrics data will automatically be deleted. enableDataKeeperExecutor: ${SW_CORE_ENABLE_DATA_KEEPER_EXECUTOR:true} # Turn it off then automatically metrics data delete will be close. dataKeeperExecutePeriod: ${SW_CORE_DATA_KEEPER_EXECUTE_PERIOD:5} # How often the data keeper executor runs periodically, unit is minute recordDataTTL: ${SW_CORE_RECORD_DATA_TTL:90} # Unit is minute minuteMetricsDataTTL: ${SW_CORE_MINUTE_METRIC_DATA_TTL:90} # Unit is minute hourMetricsDataTTL: ${SW_CORE_HOUR_METRIC_DATA_TTL:36} # Unit is hour dayMetricsDataTTL: ${SW_CORE_DAY_METRIC_DATA_TTL:45} # Unit is day monthMetricsDataTTL: ${SW_CORE_MONTH_METRIC_DATA_TTL:18} # Unit is month
recordDataTTL
affects Record data.minuteMetricsDataTTL
, hourMetricsDataTTL
, dayMetricsDataTTL
and monthMetricsDataTTL
affects metrics data in minute/hour/day/month dimensions.Specifically:
Because of the feature of ElasticSearch, it rebuilds the index after executing delete by query command. That is a heavy operation, it will hang up the ElasticSearch server for a few seconds each time. The fact is there are above hundred indexes which may cause ElasticSearch out of service unexpected. So, we create the index by day to avoid execute delete by query operation, then delete the index directly, this is a high performance operation, say goodbye to hung up.
You have following settings in Elasticsearch storage.
# Those data TTL settings will override the same settings in core module. recordDataTTL: ${SW_STORAGE_ES_RECORD_DATA_TTL:7} # Unit is day otherMetricsDataTTL: ${SW_STORAGE_ES_OTHER_METRIC_DATA_TTL:45} # Unit is day monthMetricsDataTTL: ${SW_STORAGE_ES_MONTH_METRIC_DATA_TTL:18} # Unit is month
recordDataTTL
affects Record data.otherMetricsDataTTL
affects minute/hour/day dimensions of metrics. minuteMetricsDataTTL
, hourMetricsDataTTL
and dayMetricsDataTTL
are still there, but the Unit of them changed to DAY too. If you want to set them manually, please remove otherMetricsDataTTL
.monthMetricsDataTTL
affects month dimension of metrics.