[jira] [Created] (IMPALA-10475) SYNC_DDL docs should clarify that it only affects DML

["Tim Armstrong (Jira)" <ji...@apache.org>]

Tim Armstrong created IMPALA-10475:
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             Summary: SYNC_DDL docs should clarify that it only affects DML
                 Key: IMPALA-10475
                 URL: https://issues.apache.org/jira/browse/IMPALA-10475
             Project: IMPALA
          Issue Type: Bug
          Components: Docs
            Reporter: Tim Armstrong


https://impala.apache.org/docs/build/html/topics/impala_sync_ddl.html

{noformat}
Although INSERT is classified as a DML statement, when the SYNC_DDL option is enabled, INSERT statements also delay their completion until all the underlying data and metadata changes are propagated to all Impala nodes. Internally, Impala inserts have similarities with DDL statements in traditional database systems, because they create metadata needed to track HDFS block locations for new files and they potentially add new partitions to partitioned tables. 
{noformat}

I saw someone read this as applying to all tables (Kudu, HBase, etc) but it only inherently applies to traditional non-transactional filesystem-based tables. It also applies to transactional tables until IMPALA-8631 is fixed, after which they will be more strongly consistent.



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