ES5.x 中long类型不支持time zone

妖狐艹你老母 2022-01-29 14:27 581阅读 0赞

# 问题 #

为了在ES上根据时间进行统计，我在ES5.6.4上做了date\_histogram聚合，查询语句如下所示

{
      "aggregations": {
        "dateVspAggs": {
          "date_histogram": {
            "field": "timestamp",
            "interval": "day",
            "time_zone": "+08:00",
            "order": {
              "_key": "asc"
            },
            "keyed": false,
            "min_doc_count": 0,
            "extended_bounds": {
              "min": 1551369600000,
              "max": 1554047999999
            }
          }
        }
      }
    }

因为是interval是day，所以我配置了time\_zone 参数，从而避免查询结果的bucket统计范围有时差。  
然而这个查询语句返回报错如下：

{
    "error": {
    "root_cause": [
    {
    "type": "illegal_argument_exception",
    "reason": "Field [timestamp_] of type [long] does not support custom time zones"
    }
    ],
    "type": "search_phase_execution_exception",
    "reason": "all shards failed",
    "phase": "query",
    "grouped": true,
    "failed_shards": [
    {
    "shard": 0,
    "index": "test",
    "node": "ytXqsnmdSqmbKwEyw22fXg",
    "reason": {
    "type": "illegal_argument_exception",
    "reason": "Field [timestamp_] of type [long] does not support custom time zones"
    }
    }
    ]
    },
    "status": 400
    }

报错信息显示time\_zones的配置不支持long类型的字段。  
不过值得一提的是相同的查询在ES2.x环境是能够成功执行的。

# 分析 #

为此我特意查看了ES5.x的源码，发现ES5.x对number类型的字段校验过程中，如果发现它配置了time\_zone 就会报异常，从ES5.x开始time\_zone 只支持date类型。  
相关代码如下所示  
LegacyNumberFieldMapper::NumberFieldType::docValueFormat

public DocValueFormat docValueFormat(@Nullable String format, DateTimeZone timeZone) {
                if (timeZone != null) {
                    throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] does not support custom time zones");
                }
                if (format == null) {
                    return DocValueFormat.RAW;
                } else {
                    return new DocValueFormat.Decimal(format);
                }
            }

为了进一步求证，我去github上提了问题，得到如下回答  
[https://github.com/elastic/elasticsearch/issues/42270\#issuecomment-494445970][https_github.com_elastic_elasticsearch_issues_42270_issuecomment-494445970]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxcXEwMTk5MTgx_size_16_color_FFFFFF_t_70]

# 结论 #

从ES的项目成员的回答中可以得出结论，time\_zone的特性本来就是为date类型提供的，至于ES2.x中支持long类型只是因为这个版本对错误的配置更加容忍罢了，**在ES5.x之后time\_zone只支持date类型了**。所以在ES中时间字段最好还是用date类型来存储。

[https_github.com_elastic_elasticsearch_issues_42270_issuecomment-494445970]: https://github.com/elastic/elasticsearch/issues/42270#issuecomment-494445970
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxcXEwMTk5MTgx_size_16_color_FFFFFF_t_70]: /images/20220129/d68fe34c9ba04ac2b1cde36bdd1e5992.png