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https://issues.apache.org/jira/browse/PHOENIX-5404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chinmay Kulkarni updated PHOENIX-5404:
--------------------------------------
Description:
Remove {{ViewUtil.dropChildViews(env, tenantIdBytes, schemaName, tableName);}}
call in MetdataEndpointImpl.createTable
While creating a table or view we need to ensure that are not any child views
that haven't been clean up by the DropChildView task yet. Move this check to
the client (issue a scan against SYSTEM.CHILD_LINK to see if a single linking
row exists).
was:
When we issue a {{DROP TABLE/VIEW}}, if the table/view being dropped has child
views (and {{CASCADE}} is provided), we add a
{{[DropChildViewsTask|https://github.com/apache/phoenix/blob/1d844950bb4ec8221873ecd2b094c20f427cd984/phoenix-core/src/main/java/org/apache/phoenix/coprocessor/tasks/DropChildViewsTask.java]}}
in the {{SYSTEM.TASK}} table (see
[this|https://github.com/apache/phoenix/blob/1d844950bb4ec8221873ecd2b094c20f427cd984/phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java#L2479]).
This means that *while holding the row lock* for the table/view’s header row
([here|https://github.com/apache/phoenix/blob/1d844950bb4ec8221873ecd2b094c20f427cd984/phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java#L2253])
we do the following:
# Make an
[RPC|https://github.com/apache/phoenix/blob/1d844950bb4ec8221873ecd2b094c20f427cd984/phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java#L2459-L2461]
to the region hosting {{SYSTEM.CHILD_LINK}} to scan it in order to find child
views.
# If any child views are found in the step above, we make additional RPCs to
the region hosting {{SYSTEM.TASK}} to
{{[UPSERT|https://github.com/apache/phoenix/blob/1d844950bb4ec8221873ecd2b094c20f427cd984/phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java#L2479-L2484]}}
a {{DropChildViewsTask}} for immediate child views.
# We [send remote
mutations|https://github.com/apache/phoenix/blob/1d844950bb4ec8221873ecd2b094c20f427cd984/phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java#L2298-L2302]
to drop parent→child links from the {{SYSTEM.CHILD_LINK}} table.
Of the above extra RPCs, note that even if the table/view has no child views or
if {{CASCADE}} is not provided, we will still do the first RPC from the server
while holding a row lock.
We should move this check to the client (issue a scan against SYSTEM.CHILD_LINK
to see if a single linking row exists) and also add the task from the client.
> Move check to client side to see if there are any child views that need to be
> dropped while receating a table/view
> ------------------------------------------------------------------------------------------------------------------
>
> Key: PHOENIX-5404
> URL: https://issues.apache.org/jira/browse/PHOENIX-5404
> Project: Phoenix
> Issue Type: Sub-task
> Affects Versions: 5.0.0, 4.15.0
> Reporter: Thomas D'Silva
> Assignee: Chinmay Kulkarni
> Priority: Major
> Fix For: 5.1.0, 4.16.0
>
>
> Remove {{ViewUtil.dropChildViews(env, tenantIdBytes, schemaName,
> tableName);}} call in MetdataEndpointImpl.createTable
> While creating a table or view we need to ensure that are not any child views
> that haven't been clean up by the DropChildView task yet. Move this check to
> the client (issue a scan against SYSTEM.CHILD_LINK to see if a single linking
> row exists).
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