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    • wu-sheng's avatar
      b15bbecb
    • W
      Support Elasticsearch column alias for the compatibility between storage... · 8a807002
      Wan Kai 提交于
      Support Elasticsearch column alias for the compatibility between storage logicSharding model and no-logicSharding model. (#9442)
      
      ## New ElasticSearch storage option explanation in 9.2.0
      Since v9.2.0, SkyWalking OAP provides 2 storage options for metrics/meter and records, 
      system environment variable is (`SW_STORAGE_ES_LOGIC_SHARDING`):
      
      ### No-Sharding Model (OAP default setting, `SW_STORAGE_ES_LOGIC_SHARDING = false`)
      1. OAP merges all metrics/meter and records(without super datasets, such as segments) indices into one physical 
      index template `metrics-all` and `records-all`.
      2. The logic index name would be present in columns `metric_table` and `record_table`.
      3. If the logic column name has an alias (configured by `@ElasticSearch.Column()`), the alias would be the real physical column name.
      
      ### No-Sharding Model (`SW_STORAGE_ES_LOGIC_SHARDING = true `)
      1. OAP shard metrics/meter indices into multi-physical indices as in the previous versions(one index template per metric/meter aggregation function).
      2. Records and metrics without configuring aggregation function in `@MetricsFunction` and `@MeterFunction` would not be sharded.
      3. The shard template name would be `metrics-aggregation function name` or `meter-aggregation function name` such as `metrics-count`,
      and the logic index name would be present in column `metric_table`.
      4. The OAP **would not** use the column alias, the logic column name would be the real physical column name.
      
      **Notice**: 
      Users still could choose to adjust ElasticSearch's shard number(`SW_STORAGE_ES_INDEX_SHARDS_NUMBER`) to scale out no matter the option.
      8a807002
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