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查詢結(jié)果解讀

更新時(shí)間:

查詢結(jié)果的返回形式

目前支持返回格式有四種: stringjsonfull_jsonflatbuffers,可以通過(guò)以下幾種途徑配置:

  • 在配置文件設(shè)定:HA3 SQL啟動(dòng)后全局生效,所有query默認(rèn)以設(shè)定的形式返回查詢結(jié)果。

  • 在query的kvpair子句中指定:僅對(duì)當(dāng)前query生效,當(dāng)前query以設(shè)定的形式返回查詢結(jié)果(無(wú)視配置文件中的設(shè)定的形式)。

在query的kvpair中設(shè)定返回值形式

在query的 kvpair 字段中,通過(guò) formatType:json 或者 formatType:string 來(lái)控制查詢結(jié)果的返回形式。更多的 kvpair 用法見kvpair子句

query=...&&kvpair=...;formatType:{json | string | full_json | flatbuffers};...

string形式結(jié)果解析

string形式的返回結(jié)果自帶排版格式,結(jié)果直觀,可讀性較好。一般用于開發(fā)調(diào)試,方便用戶排查問題。

/ha3_develop/source_code/ha3_manual_example/sql $ ./search.sh -s "select nid, price, brand, size from phone"
+ python2.7 /ha3_develop/install_root/usr/local/lib/python/site-packages/ha_tools/search.py -a http://localhost:39341/ -s 'select nid, price, brand, size from phone'
USE_TIME: 0.025, ROW_COUNT: 10

------------------------------- TABLE INFO ---------------------------
                 nid |               price |               brand |                size |
                   1 |                3599 |              Huawei |                 5.9 |
                   2 |                4388 |              Huawei |                 5.5 |
                   3 |                 899 |              Xiaomi |                   5 |
                   4 |                2999 |                OPPO |                 5.5 |
                   5 |                1299 |               Meizu |                 5.5 |
                   6 |                 169 |               Nokia |                 1.4 |
                   7 |                3599 |               Apple |                 4.7 |
                   8 |                5998 |               Apple |                 5.5 |
                   9 |                4298 |               Apple |                 4.7 |
                  10 |                5688 |             Samsung |                 5.6 |

------------------------------- TRACE INFO ---------------------------

------------------------------- SEARCH INFO ---------------------------
scanInfos { kernelName: "ScanKernel" nodeName: "0_0" tableName: "phone" hashKey: 243934**** parallelNum: 1 totalOutputCount: 10 totalScanCount: 10 totalUseTime: 86 totalSeekTime: 29 totalEvaluateTime: 13 totalOu\
tputTime: 43 totalComputeTimes: 1 }

JSON形式結(jié)果解析

JSON形式的結(jié)果主要用于服務(wù)調(diào)用,方便程序解析,含有的信息量也更大,下面主要介紹一下各個(gè)返回字段的含義。

/ha3_develop/source_code/ha3_manual_example/sql $ ./search.sh -s "select nid, price, brand, size from phone&&kvpair=formatType:json"
+ python2.7 /ha3_develop/install_root/usr/local/lib/python/site-packages/ha_tools/search.py -a http://localhost:39341/ -s 'select nid, price, brand, size from phone&&kvpair=formatType:json'
{
"error_info": // 輸出error信息
  "{\"Error\": ERROR_NONE}",
"format_type":
  "json",
"row_count": // 結(jié)果數(shù)
  10,
"search_info": // search 相關(guān)的一些信息,包括scan,sort等算子指標(biāo)
  "scanInfos { kernelName: \"ScanKernel\" nodeName: \"0_0\" tableName: \"phone\" hashKey: 243934**** parallelNum: 1 totalOutputCount: 10 totalScanCount: 10 totalUseTime: 81 totalSeekTime: 28 totalEvaluateTime: 1\
1 totalOutputTime: 40 totalComputeTimes: 1 }",
"sql_result": // 結(jié)果,返回json string,
  "{\"column_name\":[\"nid\",\"price\",\"brand\",\"size\"],\"column_type\":[\"uint64\",\"double\",\"multi_char\",\"double\"],\"data\":[[1,3599,\"Huawei\",5.9],[2,4388,\"Huawei\",5.5],[3,899,\"Xiaomi\",5],[4,2999\
,\"OPPO\",5.5],[5,1299,\"Meizu\",5.5],[6,169,\"Nokia\",1.4],[7,3599,\"Apple\",4.7],[8,5998,\"Apple\",5.5],[9,4298,\"Apple\",4.7],[10,5688,\"Samsung\",5.6]]}",
"total_time": // 耗時(shí),單位s
  0.024,
"trace": // trace信息
  [
  ]
}

FULL_JSON形式結(jié)果解析

full_json形式的結(jié)構(gòu)與JSON形式比較相似,唯一的不同在于sql_result字段,JSON形式下是字符串形式,full_json下是直接用JSON表示的形式。

{
        "total_time": 34.003,
        "covered_percent": 1,
        "row_count": 10 ,
        "format_type": "full_json",
        "search_info": {},
        "trace": [],
        "sql_result": {
                "data": [
                        [
                                232953260,
                                "德克士"
                        ],
                        [
                                239745260,
                                "葉氏兄弟"
                        ],
                        [
                                240084010,
                                "菜老包"
                        ],
                        [
                                240082260,
                                "周黑鴨"
                        ],
                        [
                                240086260,
                                "絕味鴨脖"
                        ],
                        [
                                240108260,
                                ""
                        ],
                        [
                                239256390,
                                "每一天生活超市"
                        ],
                        [
                                240079390,
                                "美宜佳"
                        ],
                        [
                                265230260,
                                ""
                        ],
                        [
                                239313011,
                                "大參林"
                        ]
                ],
                "column_name": [
                        "store_id",
                        "brand_name"
                ],
                "column_type": [
                        "int64",
                        "multi_char"
                ]
        },
        "error_info": {
                "ErrorCode": 0,
                "Error": "ERROR_NONE",
                "Message": ""
        }
}

sql_result詳解

{
    "column_name":[ // 列名
        "nid",
        "price",
        "brand",
        "size"
    ],
    "column_type":[ // 列類型
        "uint64",
        "double",
        "multi_char",
        "double"
    ],
    "data":[ // 每行數(shù)據(jù)
        [
            1,
            3599,
            "Huawei",
            5.9
        ],
        [
            2,
            4388,
            "Huawei",
            5.5
        ],
        [
            3,
            899,
            "Xiaomi",
            5
        ],
        [
            4,
            2999,
            "OPPO",
            5.5
        ],
        [
            5,
            1299,
            "Meizu",
            5.5
        ],
        [
            6,
            169,
            "Nokia",
            1.4
        ],
        [
            7,
            3599,
            "Apple",
            4.7
        ],
        [
            8,
            5998,
            "Apple",
            5.5
        ],
        [
            9,
            4298,
            "Apple",
            4.7
        ],
        [
            10,
            5688,
            "Samsung",
            5.6
        ]
    ]
}

searchInfo詳解

在返回結(jié)果中,searchInfo是一個(gè)較為復(fù)雜的字段,可以協(xié)助用戶分析查詢過(guò)程,以排查問題、優(yōu)化性能需在kvpairs中加searchInfo:true。

"search_info": {
        "exchangeInfos": [
                {
                        "fillResultUseTime": 1276, // exchange kernel從response結(jié)構(gòu)中獲取結(jié)果耗時(shí)
                        "hashKey": 413114****, 
                        "kernelName": "ExchangeKernel", // exchange kernel名稱
                        "nodeName": "1", // exchange kernel所屬節(jié)點(diǎn)名稱
                        "poolSize": 472, // exchange kernel所屬worker在本次查詢使用的pool大小
                        "rowCount": 2, // 所有列返回合并后的有效結(jié)果行數(shù)
                        "searcherUseTime": 7335, // 發(fā)起search請(qǐng)求的等待耗時(shí),單位為us
                        "totalAccessCount": 4 // 發(fā)起search請(qǐng)求的總列數(shù)
                }
        ],
        "rpcInfos": [ // 發(fā)起的rpc請(qǐng)求詳情,該項(xiàng)有多少列返回就有多少元素
                {
                        "beginTime": 1588131436272843, // exchange kernel調(diào)用起始時(shí)間,單位為us
                        "rpcNodeInfos": [
                                {
                                        "callUseTime": 5431, // 該rpc node耗時(shí),單位為us
                                        "isReturned": true, // 請(qǐng)求是否有返回
                                        "netLatency": 664, // 網(wǎng)絡(luò)延時(shí),單位為us
                                        "rpcBegin": 1588131436272857, // rpc調(diào)用開始時(shí)間戳,單位為us
                                        "rpcEnd": 1588131436278288, // rpc調(diào)用結(jié)束時(shí)間戳,單位為us
                                        "rpcUseTime": 5175, // rpc調(diào)用持續(xù)時(shí)間,單位為us
                                        "specStr": "11.1.XX.XX:20412" // 調(diào)用server的ip和端口
                                },
                                ...
                        ],
                                "totalRpcCount": 4, // 發(fā)出的rpc請(qǐng)求數(shù)
                                "useTime": 7335 // rpc調(diào)用總時(shí)長(zhǎng)
                        }
                ],
                "runSqlTimeInfo": {
                        "sqlPlan2GraphTime": 174, // iquan plan轉(zhuǎn)navi graph的耗時(shí),單位為us
                        "sqlPlanStartTime": 1588143112640920, // 向iquan發(fā)起plan的請(qǐng)求時(shí)間戳,單位為us
                        "sqlPlanTime": 10295, // 向iquan發(fā)起請(qǐng)求到獲取plan的總時(shí)長(zhǎng),單位為us
                        "sqlRunGraphTime": 13407 // 執(zhí)行sql圖的總時(shí)長(zhǎng),單位為us
                },
                "scanInfos": [
                        {
                                "hashKey": 691673167,
                                "kernelName": "ScanKernel", // kernel名稱
                                "parallelNum": 2, // scan并行度,全局有多少個(gè)
                                "parallelIndex": 1, // 該scan kernel屬于并行邏輯下的第幾個(gè),為0默認(rèn)不顯示
                                "tableName": "store", // table名稱
                                "totalComputeTimes": 4, // batchScan被調(diào)用的總次數(shù)
                                "totalEvaluateTime": 9, // 字段求值總耗時(shí),單位為us
                                "totalInitTime": 3758, // init階段總耗時(shí),單位為us
                                "totalOutputCount": 2, // 輸出的總行數(shù)
                                "totalOutputTime": 264, // 構(gòu)建輸出數(shù)據(jù)的總耗時(shí),包括增刪表中數(shù)據(jù),單位為us
                                "totalScanCount": 2, // scan出的記錄總數(shù)
                                "totalSeekTime": 2, // seek調(diào)用的總耗時(shí),單位為us
                                "totalUseTime": 4217 // scan kernel調(diào)用的總時(shí)長(zhǎng),單位為us
                        }
                ]
        }

Flatbuffers形式

flatbuffers形式是基于flatbuffers實(shí)現(xiàn)的高效序列化結(jié)果,在對(duì)性能有高要求的場(chǎng)景下比較實(shí)用,該形式的返回結(jié)果需要對(duì)應(yīng)的客戶端反序列化解析。

SqlResult.fbs

include "TwoDimTable.fbs";

namespace isearch.fbs;

table SqlErrorResult {
    partitionId: string (id:0);
    hostName: string (id:1);
    errorCode: uint (id:2);
    errorDescription: string (id:3);
}

table SqlResult {
    processTime: double (id:0);
    rowCount: uint32 (id:1);
    errorResult: SqlErrorResult (id:2);
    sqlTable: TwoDimTable (id:3);
    searchInfo: string (id:4);
    coveredPercent: double (id:5);
}

root_type SqlResult;

TwoDimTable.fbs

include "TsdbColumn.fbs";
namespace isearch.fbs;

// multi value
table MultiInt8   { value: [byte];   }
table MultiInt16  { value: [short];  }
table MultiInt32  { value: [int];    }
table MultiInt64  { value: [long];   }
table MultiUInt8  { value: [ubyte];  }
table MultiUInt16 { value: [ushort]; }
table MultiUInt32 { value: [uint];   }
table MultiUInt64 { value: [ulong];  }
table MultiFloat  { value: [float];  }
table MultiDouble { value: [double]; }
table MultiString { value: [string]; }

// column base storage
table Int8Column   { value: [byte];   }
table Int16Column  { value: [short];  }
table Int32Column  { value: [int];    }
table Int64Column  { value: [long];   }
table UInt8Column  { value: [ubyte];  }
table UInt16Column { value: [ushort]; }
table UInt32Column { value: [uint];   }
table UInt64Column { value: [ulong];  }
table FloatColumn  { value: [float];  }
table DoubleColumn { value: [double]; }
table StringColumn { value: [string]; }

table MultiInt8Column   { value: [MultiInt8];   }
table MultiUInt8Column  { value: [MultiUInt8];  }
table MultiInt16Column  { value: [MultiInt16];  }
table MultiUInt16Column { value: [MultiUInt16]; }
table MultiInt32Column  { value: [MultiInt32];  }
table MultiUInt32Column { value: [MultiUInt32]; }
table MultiInt64Column  { value: [MultiInt64];  }
table MultiUInt64Column { value: [MultiUInt64]; }
table MultiFloatColumn  { value: [MultiFloat];  }
table MultiDoubleColumn { value: [MultiDouble]; }
table MultiStringColumn { value: [MultiString]; }

// column type
union ColumnType {
      Int8Column,
      Int16Column,
      Int32Column,
      Int64Column,
      UInt8Column,
      UInt16Column,
      UInt32Column,
      UInt64Column,
      FloatColumn,
      DoubleColumn,
      StringColumn,
      MultiInt8Column,
      MultiInt16Column,
      MultiInt32Column,
      MultiInt64Column,
      MultiUInt8Column,
      MultiUInt16Column,
      MultiUInt32Column,
      MultiUInt64Column,
      MultiFloatColumn,
      MultiDoubleColumn,
      MultiStringColumn,
      TsdbDpsColumn,
}

table Column {
      name: string;
      value: ColumnType;
}

table TwoDimTable {
      rowCount: uint (id:0);
      columns: [Column] (id:1);
}

TsdbColumn.fbs

namespace isearch.fbs;

struct TsdbDataPoint {
      ts: int64 (id:0);
      value: double (id:1);
}
table TsdbDataPointSeries { points: [TsdbDataPoint]; }
table TsdbDpsColumn { value : [TsdbDataPointSeries]; }

注意

column_type:multi_前綴為多值類型,結(jié)構(gòu)為list,multi_char 為string類型。