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https://issues.apache.org/jira/browse/IMPALA-10475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17280016#comment-17280016
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ASF subversion and git services commented on IMPALA-10475:
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Commit 81d5377c27f1940235db332e43f1d0f073cf3d2f in impala's branch
refs/heads/master from Shajini Thayasingh
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=81d5377 ]
IMPALA-10475: [DOCS] elaborate SYNC_DDL option
call out that SYNC_DDL applies to all filesystem-based tables
Change-Id: I3f1bfce8430c681515101d00cabf9d70ae52e5ec
Reviewed-on: http://gerrit.cloudera.org:8080/17027
Tested-by: Impala Public Jenkins <[email protected]>
Reviewed-by: Tim Armstrong <[email protected]>
> 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: Task
> Components: Docs
> Reporter: Tim Armstrong
> Assignee: shajini thayasingh
> Priority: Major
>
> 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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