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compaction-score.md

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title View Tablet Compaction Score
language en
description It is used to view tablet compaction scores on a BE node.

View Tablet Compaction Score

Request

GET /api/compaction_score?top_n={int}&sync_meta={bool}

Description

It is used to view tablet compaction scores on a BE node. The compaction score is calculated as the sum of the compaction scores of all rowsets in each tablet. The response is sorted by compaction_score in descending order.

Query parameters

  • top_n

    Optional. A non-negative integer. If specified, only the top N tablets with the highest compaction scores are returned. If not specified, all tablets on the BE node are returned. top_n=0 returns an empty array.

  • sync_meta

    Optional. Cloud mode only. Valid values are true and false. If set to true, BE synchronizes tablet metadata and rowsets from the meta service before calculating the compaction scores. Do not specify this parameter in non-cloud mode.

Request body

None

Response

Returns a JSON array. Each element contains the following fields:

  • tablet_id: Tablet ID. The value is returned as a string.
  • compaction_score: Tablet compaction score. The value is returned as a string.

Example response:

[
    {
        "compaction_score": "5",
        "tablet_id": "42595"
    },
    {
        "compaction_score": "4",
        "tablet_id": "10034"
    }
]

Error handling

  • If top_n is not a valid non-negative integer, the API returns HTTP 400 with an error such as invalid argument: top_n=wrong.
  • If sync_meta is specified in non-cloud mode, the API returns HTTP 400 with an error message: param `sync_meta` is only available for cloud mode.
  • If sync_meta is not true or false, the API returns HTTP 400 with an error such as invalid argument: sync_meta=wrong.

Examples

View the top 10 tablets with the highest compaction scores:

curl "http://127.0.0.1:8040/api/compaction_score?top_n=10"

View compaction scores after synchronizing metadata in cloud mode:

curl "http://127.0.0.1:8040/api/compaction_score?top_n=10&sync_meta=true"