Comments (5)
Hi.
This is how alembic works. In case of postgresql alembic_version
stores only one row. If you combine this mechanism with Replacing
engine rows will disappear after merge.
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@xzkostyan May I know what is the way we can handle both expand and contract migrations in clickhouse cluster mode by persisting both expand and contract revisions (same as how it does for psql, as we are using postgresql and it works correctly for postgresql by persisting both version_ids)?
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same as how it does for psql, as we are using postgresql and it works correctly for postgresql by persisting both version_ids
Can you provide example for PG?
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@xzkostyan here is the code snippet and postgres snippet attached.
sample=# select * from alembic_version ;
version_num
--------------
314abe8f5fce
9e15486b29e1
(2 rows)
sample=#
sample=#
sample=# \d alembic_version
Table "public.alembic_version"
Column | Type | Collation | Nullable | Default
-------------+-----------------------+-----------+----------+---------
version_num | character varying(32) | | not null |
Indexes:
"alembic_version_pkc" PRIMARY KEY, btree (version_num)
sample=#
Additionally, the executions are triggered by providing expand and contract BRANCH in below docker command.
docker run --pull=always --rm \
-v ${PWD}/../${SERVICE}/migrations/contract:/alembic/contract \
-v ${PWD}/../${SERVICE}/migrations/expand:/alembic/expand \
--net default \
-e "POSTGRES_USERNAME=" \
-e "POSTGRES_PASSWORD=" \
-e "POSTGRES_HOST=" \
-e "POSTGRES_PORT=5432" \
-e "POSTGRES_DB_NAME=" \
-e "POSTGRES_MANAGED_DB_NAME=${SERVICE}"\
-e "POSTGRES_MANAGED_PASSWORD="\
alembic:1.13 \
upgrade ${BRANCH}@head
```
from clickhouse-sqlalchemy.
@xzkostyan could you please check the above code and suggest for clickhouse?
cc: @s-dhamodhran @arunmahendran
from clickhouse-sqlalchemy.
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