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Posted to reviews@impala.apache.org by "Sanjana Malhotra (Code Review)" <ge...@cloudera.org> on 2026/10/01 10:11:56 UTC

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Sanjana Malhotra has uploaded this change for review. ( http://gerrit.cloudera.org:8080/24993


Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................

IMPALA-15415: [DOCS] Documentation for HBO

Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
---
M docs/impala.ditamap
A docs/topics/impala_history_based_optimization.xml
A docs/topics/impala_store_hbo_stats.xml
A docs/topics/impala_use_hbo_stats.xml
4 files changed, 233 insertions(+), 0 deletions(-)



  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/93/24993/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Gerrit-Change-Number: 24993
Gerrit-PatchSet: 1
Gerrit-Owner: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Sanjana Malhotra (Code Review)" <ge...@cloudera.org>.
Sanjana Malhotra has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 1:

(12 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@38
PS1, Line 38: cardinality
> "execution" or "runtime" is better. Cardinality is one kind of stats and we
Sure, updated with runtime.


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 re
Done


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@42
PS1, Line 42:     <p>HBO support is implemented incrementally by plan node types. Impala currently supports HBO
            :       for the following plan nodes:</p>
            :     <ul>
            :       <li>ScanNode</li>
            :       <li>AggregationNode</li>
            :       <li>UnionNode</li>
            :       <li>JoinNode</li>
            :     </ul>
> This will be stale quickly since we are actively adding new node types. Mig
Done


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@55
PS1, Line 55:     <p outputclass="toc inpage all"/>
> Can we show some examples? e.g. use some outputs from
Done


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@70
PS1, Line 70:               STORE_HBO_STATS</codeph>=<codeph>true</codeph>;</li>
> Let's mention the historical execution stats are stored asynchronously afte
Done


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 identi
Done


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@101
PS1, Line 101: query
> The key can be shared by similar queries. Using "hash key" might be more sp
Done


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@105
PS1, Line 105:                   <entry>Specifies the maximum memory size, in bytes, allocated for the in-memory backend HBO cache.</entry>
> Let's mention the default values for these flags. We can also reuse some de
Done


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_store_hbo_stats.xml
File docs/topics/impala_store_hbo_stats.xml:

http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_store_hbo_stats.xml@40
PS1, Line 40: upon completion
> Let's emphasize its asynchronous.
updating with <p>When enabled, Impala collects actual cardinality statistics during query processing and stores
      them asynchronously in the HBO cache after the query completes. This asynchronous storage does
      not add significant latency to query execution. These saved entries provide the historical
      baseline used during future query planning when <parmname>USE_HBO_STATS</parmname> is
      enabled.</p>


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_store_hbo_stats.xml@49
PS1, Line 49: (ScanNode, AggregationNode, UnionNode, and JoinNode)
> This is stale since SortNode is also supported now. Let's use "e.g. HdfsSca
Done


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@40
PS1, Line 40: (ScanNode,
            :       AggregationNode, UnionNode, or JoinNode)
> use "e.g. ..."
Done


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 make
Updating with <li>You can enable <parmname>USE_HBO_STATS</parmname> and <parmname>STORE_HBO_STATS</parmname>
        independently. Enable <parmname>STORE_HBO_STATS</parmname> to collect and store statistics,
        and enable <parmname>USE_HBO_STATS</parmname> to read and apply stored statistics during
        query planning. Enable both options to fully participate in history-based plan
        optimization.</li>



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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 <ma...@gmail.com>
Gerrit-Reviewer: Aleksandr Efimov <dz...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Comment-Date: Mon, 12 Oct 2026 14:45:33 +0000
Gerrit-HasComments: Yes

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Impala Public Jenkins (Code Review)" <ge...@cloudera.org>.
Impala Public Jenkins has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 4:

Build Started https://jenkins.impala.io/job/gerrit-docs-auto-test/942/ 

Testing docs change - this change appears to modify docs/ and no code. This is experimental - please report any issues to tarmstrong@cloudera.com or on this JIRA: IMPALA-7317


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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Gerrit-Change-Number: 24993
Gerrit-PatchSet: 4
Gerrit-Owner: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Reviewer: Aleksandr Efimov <dz...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Comment-Date: Tue, 13 Oct 2026 04:30:22 +0000
Gerrit-HasComments: No

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Impala Public Jenkins (Code Review)" <ge...@cloudera.org>.
Impala Public Jenkins has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 3: Verified+1

Build Successful 

https://jenkins.impala.io/job/gerrit-docs-auto-test/941/ : Doc tests passed.


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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Gerrit-Change-Number: 24993
Gerrit-PatchSet: 3
Gerrit-Owner: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Reviewer: Aleksandr Efimov <dz...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Comment-Date: Mon, 12 Oct 2026 16:26:20 +0000
Gerrit-HasComments: No

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Impala Public Jenkins (Code Review)" <ge...@cloudera.org>.
Impala Public Jenkins has submitted this change and it was merged. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................

IMPALA-15415: [DOCS] Documentation for HBO

Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Reviewed-on: http://gerrit.cloudera.org:8080/24993
Reviewed-by: Quanlong Huang <hu...@gmail.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>
---
M docs/impala.ditamap
M docs/topics/impala_clear_hbo_stats.xml
A docs/topics/impala_history_based_optimization.xml
A docs/topics/impala_store_hbo_stats.xml
A docs/topics/impala_use_hbo_stats.xml
5 files changed, 265 insertions(+), 0 deletions(-)

Approvals:
  Quanlong Huang: Looks good to me, approved
  Impala Public Jenkins: Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Gerrit-Change-Number: 24993
Gerrit-PatchSet: 6
Gerrit-Owner: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Reviewer: Aleksandr Efimov <dz...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Quanlong Huang (Code Review)" <ge...@cloudera.org>.
Quanlong Huang has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 4: Code-Review+2


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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Gerrit-Change-Number: 24993
Gerrit-PatchSet: 4
Gerrit-Owner: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Reviewer: Aleksandr Efimov <dz...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Comment-Date: Tue, 13 Oct 2026 06:25:57 +0000
Gerrit-HasComments: No

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Quanlong Huang (Code Review)" <ge...@cloudera.org>.
Quanlong Huang has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 5: Code-Review+2


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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Gerrit-Change-Number: 24993
Gerrit-PatchSet: 5
Gerrit-Owner: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Reviewer: Aleksandr Efimov <dz...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Comment-Date: Tue, 13 Oct 2026 06:27:31 +0000
Gerrit-HasComments: No

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Sanjana Malhotra (Code Review)" <ge...@cloudera.org>.
Sanjana Malhotra has uploaded a new patch set (#4). ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................

IMPALA-15415: [DOCS] Documentation for HBO

Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
---
M docs/impala.ditamap
M docs/topics/impala_clear_hbo_stats.xml
A docs/topics/impala_history_based_optimization.xml
A docs/topics/impala_store_hbo_stats.xml
A docs/topics/impala_use_hbo_stats.xml
5 files changed, 265 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/93/24993/4
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Gerrit-Change-Number: 24993
Gerrit-PatchSet: 4
Gerrit-Owner: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Reviewer: Aleksandr Efimov <dz...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Impala Public Jenkins (Code Review)" <ge...@cloudera.org>.
Impala Public Jenkins has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 1:

Build Started https://jenkins.impala.io/job/gerrit-docs-auto-test/939/ 

Testing docs change - this change appears to modify docs/ and no code. This is experimental - please report any issues to tarmstrong@cloudera.com or on this JIRA: IMPALA-7317


-- 
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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 <ma...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Comment-Date: Thu, 01 Oct 2026 10:12:05 +0000
Gerrit-HasComments: No

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Impala Public Jenkins (Code Review)" <ge...@cloudera.org>.
Impala Public Jenkins has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 2:

Build Started https://jenkins.impala.io/job/gerrit-docs-auto-test/940/ 

Testing docs change - this change appears to modify docs/ and no code. This is experimental - please report any issues to tarmstrong@cloudera.com or on this JIRA: IMPALA-7317


-- 
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Gerrit-Change-Number: 24993
Gerrit-PatchSet: 2
Gerrit-Owner: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Reviewer: Aleksandr Efimov <dz...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Comment-Date: Mon, 12 Oct 2026 14:45:49 +0000
Gerrit-HasComments: No

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Quanlong Huang (Code Review)" <ge...@cloudera.org>.
Quanlong Huang has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 3:

(6 comments)

http://gerrit.cloudera.org:8080/#/c/24993/3/docs/topics/impala_clear_hbo_stats.xml
File docs/topics/impala_clear_hbo_stats.xml:

http://gerrit.cloudera.org:8080/#/c/24993/3/docs/topics/impala_clear_hbo_stats.xml@112
PS3, Line 112:     </p>
Let's also reference impala_history_based_optimization.xml here.


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@42
PS1, Line 42:       generate an optimized query plan.</p>
            :     <p>HBO support is implemented incrementally by plan node types. Impala currently supports HBO
            :       for the following plan nodes:</p>
            :     <ul>
            :       <li>ScanNode</li>
            :       <li>AggregationNode</li>
            :       <li>UnionNode</li>
            :       <li
> Done
Not done yet..


http://gerrit.cloudera.org:8080/#/c/24993/2/docs/topics/impala_history_based_optimization.xml
File docs/topics/impala_history_based_optimization.xml:

http://gerrit.cloudera.org:8080/#/c/24993/2/docs/topics/impala_history_based_optimization.xml@78
PS2, Line 78:       statistics, allowing cardinality to be reused across queries with different partition
> nit: IGNORE_PARTITION_CONSTANTS is a strategy, not a flag.
We can just keep the first sentense "In this example, HBO provides cardinality estimates of 31 rows for the first scan and 365 rows for the second scan."

The following part of this paragraph is explaining the canonicalization strategy (EXPR_REWRITE and IGNORE_PARTITION_CONSTANTS). If you feel it hard to explain, we can skip them in this patch and add them later.


http://gerrit.cloudera.org:8080/#/c/24993/3/docs/topics/impala_store_hbo_stats.xml
File docs/topics/impala_store_hbo_stats.xml:

http://gerrit.cloudera.org:8080/#/c/24993/3/docs/topics/impala_store_hbo_stats.xml@50
PS3, Line 50: historical profiles
This is confusing since all queries have a profile. Maybe use "historical stats".


http://gerrit.cloudera.org:8080/#/c/24993/3/docs/topics/impala_store_hbo_stats.xml@59
PS3, Line 59:   </conbody>
Can we add a link to the USE_HBO_STATS page and the main HBO page?


http://gerrit.cloudera.org:8080/#/c/24993/3/docs/topics/impala_use_hbo_stats.xml
File docs/topics/impala_use_hbo_stats.xml:

http://gerrit.cloudera.org:8080/#/c/24993/3/docs/topics/impala_use_hbo_stats.xml@60
PS3, Line 60:   </conbody>
Can we add a link to the STORE_HBO_STATS page and the main HBO page?



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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Gerrit-Change-Number: 24993
Gerrit-PatchSet: 3
Gerrit-Owner: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Reviewer: Aleksandr Efimov <dz...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Comment-Date: Tue, 13 Oct 2026 02:00:29 +0000
Gerrit-HasComments: Yes

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Impala Public Jenkins (Code Review)" <ge...@cloudera.org>.
Impala Public Jenkins has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 2: Verified+1

Build Successful 

https://jenkins.impala.io/job/gerrit-docs-auto-test/940/ : Doc tests passed.


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Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Gerrit-Change-Number: 24993
Gerrit-PatchSet: 2
Gerrit-Owner: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Reviewer: Aleksandr Efimov <dz...@gmail.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>
Gerrit-Reviewer: Sanjana Malhotra <ma...@gmail.com>
Gerrit-Comment-Date: Mon, 12 Oct 2026 14:51:47 +0000
Gerrit-HasComments: No

[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Impala Public Jenkins (Code Review)" <ge...@cloudera.org>.
Impala Public Jenkins has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 3:

Build Started https://jenkins.impala.io/job/gerrit-docs-auto-test/941/ 

Testing docs change - this change appears to modify docs/ and no code. This is experimental - please report any issues to tarmstrong@cloudera.com or on this JIRA: IMPALA-7317


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Gerrit-MessageType: comment
Gerrit-Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
Gerrit-Change-Number: 24993
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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Aleksandr Efimov (Code Review)" <ge...@cloudera.org>.
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.



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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Impala Public Jenkins (Code Review)" <ge...@cloudera.org>.
Impala Public Jenkins has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 1: Verified+1

Build Successful 

https://jenkins.impala.io/job/gerrit-docs-auto-test/939/ : Doc tests passed.


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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Aleksandr Efimov (Code Review)" <ge...@cloudera.org>.
Aleksandr Efimov has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 3: Code-Review+1


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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Impala Public Jenkins (Code Review)" <ge...@cloudera.org>.
Impala Public Jenkins has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 5:

Build started: https://jenkins.impala.io/job/gerrit-docs-submit/400/ DRY_RUN=false


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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Aleksandr Efimov (Code Review)" <ge...@cloudera.org>.
Aleksandr Efimov has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 2:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/24993/2/docs/topics/impala_history_based_optimization.xml
File docs/topics/impala_history_based_optimization.xml:

http://gerrit.cloudera.org:8080/#/c/24993/2/docs/topics/impala_history_based_optimization.xml@78
PS2, Line 78:       rather than specific constant values.</p>
Only IGNORE_PARTITION_CONSTANTS ignores partition constants. Scan inputs still need to match.



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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Sanjana Malhotra (Code Review)" <ge...@cloudera.org>.
Sanjana Malhotra has uploaded a new patch set (#3). ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................

IMPALA-15415: [DOCS] Documentation for HBO

Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
---
M docs/impala.ditamap
A docs/topics/impala_history_based_optimization.xml
A docs/topics/impala_store_hbo_stats.xml
A docs/topics/impala_use_hbo_stats.xml
4 files changed, 269 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/93/24993/3
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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Impala Public Jenkins (Code Review)" <ge...@cloudera.org>.
Impala Public Jenkins has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 4: Verified+1

Build Successful 

https://jenkins.impala.io/job/gerrit-docs-auto-test/942/ : Doc tests passed.


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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Aleksandr Efimov (Code Review)" <ge...@cloudera.org>.
Aleksandr Efimov has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 2:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/24993/2/docs/topics/impala_history_based_optimization.xml
File docs/topics/impala_history_based_optimization.xml:

http://gerrit.cloudera.org:8080/#/c/24993/2/docs/topics/impala_history_based_optimization.xml@78
PS2, Line 78:       rather than specific constant values.</p>
> Only IGNORE_PARTITION_CONSTANTS ignores partition constants. Scan inputs st
nit: IGNORE_PARTITION_CONSTANTS is a strategy, not a flag.



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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Quanlong Huang (Code Review)" <ge...@cloudera.org>.
Quanlong Huang has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 1:

(9 comments)

Thanks for adding the docs quickly!

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@38
PS1, Line 38: cardinality
"execution" or "runtime" is better. Cardinality is one kind of stats and we will support more stats types in the future.


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@42
PS1, Line 42:     <p>HBO support is implemented incrementally by plan node types. Impala currently supports HBO
            :       for the following plan nodes:</p>
            :     <ul>
            :       <li>ScanNode</li>
            :       <li>AggregationNode</li>
            :       <li>UnionNode</li>
            :       <li>JoinNode</li>
            :     </ul>
This will be stale quickly since we are actively adding new node types. Might be better to say

"HBO support is implemented incrementally by plan node types and statistics types. Impala currently supports HBO cardinality for HdfsScanNode, AggregationNode, UnionNode, JoinNode and SortNode, etc."


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@55
PS1, Line 55:     <p outputclass="toc inpage all"/>
Can we show some examples? e.g. use some outputs from
https://github.com/apache/impala/blob/a64de02/testdata/workloads/functional-query/queries/QueryTest/hbo-multiple-scans.test


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@70
PS1, Line 70:               STORE_HBO_STATS</codeph>=<codeph>true</codeph>;</li>
Let's mention the historical execution stats are stored asynchronously after the query finishes, so this won't add significant latency.


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@101
PS1, Line 101: query
The key can be shared by similar queries. Using "hash key" might be more specific.

Also add "When exceeded, the oldest run is evicted."


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_history_based_optimization.xml@105
PS1, Line 105:                   <entry>Specifies the maximum memory size, in bytes, allocated for the in-memory backend HBO cache.</entry>
Let's mention the default values for these flags. We can also reuse some descriptions here:
https://github.com/apache/impala/blob/51e080d2933eae166c1cb50e2e0d1785bea5e25b/be/src/common/global-flags.cc#L254-L265


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_store_hbo_stats.xml
File docs/topics/impala_store_hbo_stats.xml:

http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_store_hbo_stats.xml@40
PS1, Line 40: upon completion
Let's emphasize its asynchronous.


http://gerrit.cloudera.org:8080/#/c/24993/1/docs/topics/impala_store_hbo_stats.xml@49
PS1, Line 49: (ScanNode, AggregationNode, UnionNode, and JoinNode)
This is stale since SortNode is also supported now. Let's use "e.g. HdfsScanNode, AggregationNode, JoinNode".


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@40
PS1, Line 40: (ScanNode,
            :       AggregationNode, UnionNode, or JoinNode)
use "e.g. ..."



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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Impala Public Jenkins (Code Review)" <ge...@cloudera.org>.
Impala Public Jenkins has posted comments on this change. ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................


Patch Set 5: Verified+1


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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Aleksandr Efimov (Code Review)" <ge...@cloudera.org>.
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:

(2 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 re
Could we say “default in-memory cache”? Redis/Valkey is now supported.


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 make
Looks good, thanks.



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[Impala-ASF-CR] IMPALA-15415: [DOCS] Documentation for HBO

Posted by "Sanjana Malhotra (Code Review)" <ge...@cloudera.org>.
Sanjana Malhotra has uploaded a new patch set (#2). ( http://gerrit.cloudera.org:8080/24993 )

Change subject: IMPALA-15415: [DOCS] Documentation for HBO
......................................................................

IMPALA-15415: [DOCS] Documentation for HBO

Change-Id: I75fc76691ceed4e74e5c1aec3a409e1c41d4db7d
---
M docs/impala.ditamap
A docs/topics/impala_history_based_optimization.xml
A docs/topics/impala_store_hbo_stats.xml
A docs/topics/impala_use_hbo_stats.xml
4 files changed, 268 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/93/24993/2
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