Aleksandr Efimov has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )
Change subject: IMPALA-15415: [DOCS] Documentation for HBO ...................................................................... Patch Set 1: (3 comments) http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml File docs/topics/impala_history_based_optimization.xml: http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@39 PS1, Line 39: query processing and stores them in the HBO cache. During subsequent query planning, the Could we mention that the cache is currently per-coordinator and lost on restart? http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@97 PS1, Line 97: <entry>Specifies the similarity threshold value used to match queries against historical entries in the HBO cache.</entry> The threshold compares scan input statistics (default 10%), and keys identify plan-node subtrees rather than whole queries. It would help to make that distinction here. http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_use_hbo_stats.xml File docs/topics/impala_use_hbo_stats.xml: http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_use_hbo_stats.xml@49 PS1, Line 49: <li>Enable this option in combination with <parmname>STORE_HBO_STATS</parmname> to participate Reading and storing history can be enabled independently. This wording makes it sound like both options are required. -- To view, visit http://gerrit.cloudera.org:8080/24993 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d Gerrit-Change-Number: 24993 Gerrit-PatchSet: 1 Gerrit-Owner: Sanjana Malhotra <[email protected]> Gerrit-Reviewer: Aleksandr Efimov <[email protected]> Gerrit-Reviewer: Impala Public Jenkins <[email protected]> Gerrit-Reviewer: Quanlong Huang <[email protected]> Gerrit-Reviewer: Sanjana Malhotra <[email protected]> Gerrit-Comment-Date: Fri, 02 Oct 2026 11:11:27 +0000 Gerrit-HasComments: Yes
