更新时间:2022-05-19 GMT+08:00
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操作并发

DDLDML中的操作,执行前,需要获取对应的锁,各操作需要获取锁的情况见表1 操作获取锁一览表,√表示需要获取该锁,一个操作仅在获取到所有需要获取的锁后,才能继续执行。

任意两个操作是否可以并发执行,可以通过如下方法确定:表1两行代表两个操作,这两行没有任意一列都标记√,即不存在某一列两行全为√。

表1 操作获取锁一览表

操作

METADATA_LOCK

COMPACTION_LOCK

DROP_TABLE_LOCK

DELETE_SEGMENT_LOCK

CLEAN_FILES_LOCK

ALTER_PARTITION_LOCK

UPDATE_LOCK

STREAMING_LOCK

CONCURRENT_LOAD_LOCK

SEGMENT_LOCK

CREATE TABLE

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CREATE TABLE As SELECT

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DROP TABLE

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ALTER TABLE COMPACTION

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TABLE RENAME

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ADD COLUMNS

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DROP COLUMNS

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CHANGE DATA TYPE

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REFRESH TABLE

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REGISTER INDEX TABLE

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REFRESH INDEX

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LOAD DATA/INSERT INTO

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UPDATE CARBON TABLE

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DELETE RECORDS from CARBON TABLE

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DELETE SEGMENT by ID

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DELETE SEGMENT by DATE

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SHOW SEGMENTS

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CREATE SECONDARY INDEX

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SHOW SECONDARY INDEXES

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DROP SECONDARY INDEX

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CLEAN FILES

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SET/RESET

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Add Hive Partition

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Drop Hive Partition

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Drop Partition

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Alter table set

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