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https://issues.apache.org/jira/browse/IMPALA-8301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong updated IMPALA-8301:
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Component/s: Catalog
> Eliminate need for SYNC_DDL in local catalog mode
> -------------------------------------------------
>
> Key: IMPALA-8301
> URL: https://issues.apache.org/jira/browse/IMPALA-8301
> Project: IMPALA
> Issue Type: Improvement
> Components: Catalog
> Reporter: Boris Gitline
> Priority: Major
> Labels: catalog-v2
>
> In the following scenario looks like the INSERT on coordinator 2 is gated
> behind a long-running DDL on coordinator 1. That scenario still requires
> SYNC_DDL even in metadata v2. We want to change the metadata handling design
> so that coordinator 3 does not have to wait for the long-running DDL to
> complete – it would render the correct result on the target table t1
> reference.
> Step1. coordinator 1
> ##*say*, the following compute stats runs about 100 seconds
> compute stats tao_ddl_contention;
> [steps 2 and 3 are performed while COMPUTE STATS is running]
> Step2. coordinator 2
> create another new table.
> create table t1(c1 int);
> insert into t1 select 1 ;
> select * from t1;
> [can see the inserted rows]
> Step3. coordinator 3
> query the newly inserted rows in t1 while the COMPUTE STATS is still running:
> select * from t1;
> [see no rows]
> ##the query in [Step3] won't show the row inserted by step2 until the first
> step "compute stats" completed, unless:
> - SYNC_DDL is set before the INSERT on coordinator 2, or
> * when the step1 compute stats is completed, or
> * you can see the data from this impala session, or
> * a manual refresh of the t1 table.
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