[Feature] Support SHOW DATA SKEW stmt#6219
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morningman merged 3 commits intoapache:masterfrom Aug 5, 2021
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Jul 14, 2021
| 说明： | ||
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| 1. 必须指定且仅指定一个分区。对于非分区表，分区名称同表名。 | ||
| 2. 结果将展示指定分区下，各个分桶的数据量，以及每个分桶数据量在总数据量中的占比。 |
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| 语法： | ||
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| ADMIN SHOW DATA SKEW FROM [db_name.]tbl_name [PARTITION (p1)]; |
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如果 partition 是必填项，那么不用加 []
| KW_REPAIR, KW_REPEATABLE, KW_REPOSITORY, KW_REPOSITORIES, KW_REPLACE, KW_REPLACE_IF_NOT_NULL, KW_REPLICA, KW_RESOURCE, KW_RESOURCES, KW_RESTORE, KW_RETURNS, KW_RESUME, KW_REVOKE, | ||
| KW_RIGHT, KW_ROLE, KW_ROLES, KW_ROLLBACK, KW_ROLLUP, KW_ROUTINE, KW_ROW, KW_ROWS, | ||
| KW_S3, KW_SCHEMA, KW_SCHEMAS, KW_SECOND, KW_SELECT, KW_SEMI, KW_SERIALIZABLE, KW_SESSION, KW_SET, KW_SETS, KW_SET_VAR, KW_SHOW, KW_SIGNED, | ||
| KW_SKEW, |
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Pay attention to the format
| dbName = ClusterNamespace.getFullName(getClusterName(), tblRef.getName().getDb()); | ||
| } | ||
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| tblRef.getName().setDb(dbName); |
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analyze tblRef before check partition
SHOW DATA SKEW FROM tbl PARTITION(p1) to view the data distribution of a specified partition
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SHOW DATA SKEW FROM tbl PARTITION(p1) to view the data distribution of a specified partition ``` mysql> admin show data skew from tbl1 partition(tbl1); +-----------+-------------+-------+---------+ | BucketIdx | AvgDataSize | Graph | Percent | +-----------+-------------+-------+---------+ | 0 | 0 | | 100.00% | +-----------+-------------+-------+---------+ 1 row in set (0.01 sec) ``` Also modify the result of `admin show replica distribution`, add replica size distribution ``` mysql> admin show replica distribution from tbl1 partition(tbl1); +-----------+------------+-------------+----------+------------+-----------+-------------+ | BackendId | ReplicaNum | ReplicaSize | NumGraph | NumPercent | SizeGraph | SizePercent | +-----------+------------+-------------+----------+------------+-----------+-------------+ | 10002 | 1 | 0 | > | 100.00% | | 100.00% | +-----------+------------+-------------+----------+------------+-----------+-------------+ ``` Change-Id: I74e392cec4a72bbb8a4b5ef9e2b7302a062d6b88
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Proposed changes
SHOW DATA SKEW FROM tbl PARTITION(p1)
to view the data distribution of a specified partition
Also modify the result of
admin show replica distribution, add replica size distributionTypes of changes
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