SHOW EXPORT

Description

Queries the execution information of export jobs that meet the specified conditions.

Syntax

SHOW EXPORT
[ FROM <db_name> ]
[
WHERE
    [ QUERYID = <query_id> ]
    [ STATE = { "PENDING" | "EXPORTING" | "FINISHED" | "CANCELLED" } ]
]
[ ORDER BY <field_name> [ ASC | DESC ] [, ... ] ]
[ LIMIT <count> ]

Parameters

This statement can contain the following optional clauses:

  • FROM

    Specifies the name of the database that you want to query. If you do not specify a FROM clause, CelerData queries the current database.

  • WHERE

    Specifies the conditions based on which you want to filter export jobs. Only the export jobs that meet the specified conditions are returned in the result set of the query.

    ParameterRequiredDescription
    QUERYIDNoThe ID of the export job that you want to query. This parameter is used to query the execution information of a single export job.
    STATENoThe status of the export jobs that you want to query. Valid values:
    • PENDING: specifies to query export jobs that are waiting to be scheduled.
    • EXPORTING: specifies to query export jobs that are being executed.
    • FINISHED: specifies to query export jobs that have been successfully completed.
    • CANCELLED: specifies to query export jobs that have failed.

  • ORDER BY

    Specifies the name of the field based on which you want to sort the export job records in the result set of the query. You can specify multiple fields, which must be separated with commas (,). Additionally, you can use the ASC or DESC keyword to specify that the export job records are sorted in ascending or descending order based on the specified field.

  • LIMIT

    Restricts the result set of the query to a specified maximum number of rows. Valid values: positive integer. If you do not specify a LIMIT clause, CelerData returns all export jobs that meet the specified conditions.

Return result

For example, query the execution information of an export job whose ID is edee47f0-abe1-11ec-b9d1-00163e1e238f:

SHOW EXPORT
WHERE QUERYID = "edee47f0-abe1-11ec-b9d1-00163e1e238f";

The following execution information is returned:

     JobId: 14008
   QueryId: edee47f0-abe1-11ec-b9d1-00163e1e238f
     State: FINISHED
  Progress: 100%
  TaskInfo: {"partitions":["*"],"column separator":"\t","columns":["*"],"tablet num":10,"broker":"","coord num":1,"db":"db0","tbl":"tbl_simple","row delimiter":"\n","mem limit":2147483648}
      Path: hdfs://127.0.0.1:9000/users/230320/
CreateTime: 2023-03-20 11:16:14
 StartTime: 2023-03-20 11:16:17
FinishTime: 2023-03-20 11:16:26
   Timeout: 7200

The parameters in the return result are described as follows:

  • JobId: the ID of the export job.

  • QueryId: the ID of the query.

  • State: the status of the export job.

    Valid values:

    • PENDING: The export job is waiting to be scheduled.
    • EXPORTING: The export job is being executed.
    • FINISHED: The export job has been successfully completed.
    • CANCELLED: The export job has failed.

  • Progress: the progress of the export job. The progress is measured in the unit of query plans. Suppose that the export job is divided into 10 query plans and three of them have finished. In this case, the progress of the export job is 30%.

  • TaskInfo: the information of the export job.

    The information is a JSON object that consists of the following keys:

    • partitions: the partitions on which the exported data resides. If a wildcard (*) is returned as a value for this key, the export job is run to export data from all partitions.
    • column separator: the column separator used in the exported data file.
    • columns: the names of the columns whose data is exported.
    • tablet num: the total number of tablets that are exported.
    • broker: This field returns an empty string.
    • coord num: the number of query plans into which the export job is divided.
    • db: the name of the database to which the exported data belongs.
    • tbl: the name of the table to which the exported data belongs
    • row delimiter: the row separator used in the exported data file.
    • mem limit: the maximum amount of memory allowed for the export job. Unit: bytes.

  • Path: the path to which the exported data is stored on the remote storage.

  • CreateTime: the time when the export job was created.

  • StartTime: the time when the export job started to be scheduled.

  • FinishTime: the time when the export job was finished.

  • Timeout: the amount of time that the export job took than expected. Unit: seconds. The time is counted from CreateTime.

  • ErrorMsg: the reason why the export job throws an error. This field is returned only when the export job encounters an error.

Examples

  • Query all export jobs in the current database:

    SHOW EXPORT;

  • Query the export job whose ID is 921d8f80-7c9d-11eb-9342-acde48001122 in the database example_db:

    SHOW EXPORT FROM example_db
WHERE queryid = "921d8f80-7c9d-11eb-9342-acde48001122";

  • Query export jobs that are in the EXPORTING state in the database example_db and specify to sort the export job records in the result set by StartTime in ascending order：

    SHOW EXPORT FROM example_db
WHERE STATE = "exporting"
ORDER BY StartTime ASC;

  • Query all export jobs in the database example_db and specify to sort the export job records in the result set by StartTime in descending order:

    SHOW EXPORT FROM example_db
ORDER BY StartTime DESC;
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