Calcite patterns command brain pattern method #3570

songkant-aws · 2025-04-22T02:41:28Z

Description

This aims to resolve #3569

BRAIN pattern method of Patterns command is implemented by combined UDF and UDAF.

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

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New functionality includes testing.
New functionality has been documented.
New functionality has javadoc added.
New functionality has a user manual doc added.
API changes companion pull request created.
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Public documentation issue/PR created.

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Signed-off-by: Songkan Tang <[email protected]>

penghuo · 2025-06-04T16:47:11Z

docs/user/ppl/cmd/patterns.rst

+* byClause: optional. The log groups to be labeled or aggregated. It could be fields and scalar functions.
+* pattern_method: optional. Specify pattern method to be simple_pattern. By default, it's simple_pattern if the setting ``plugins.ppl.default.pattern.method`` is not specified.
+* pattern_mode: optional. label mode or aggregation mode. Default is label mode.
+* pattern_max_sample_count: optional. The max sample logs to be returned per pattern in aggregation mode.


if it is optional, add default value in doc.

Done. Added default value

penghuo · 2025-06-04T16:49:30Z

docs/user/ppl/cmd/patterns.rst

+* pattern_method: optional. Specify pattern method to be brain. By default, it's simple_pattern if the setting ``plugins.ppl.default.pattern.method`` is not specified.
+* pattern_mode: optional. label mode or aggregation mode. Default is label mode.
+* pattern_max_sample_count: optional. The max sample logs to be returned per pattern in aggregation mode.
+* pattern_buffer_limit: optional. This is a special safeguard parameter for BRAIN algorithm to limit internal temporary buffer to hold processed logs.


remove "special"

penghuo · 2025-06-04T16:50:57Z

docs/user/ppl/cmd/patterns.rst

+* pattern_max_sample_count: optional. The max sample logs to be returned per pattern in aggregation mode.
+* pattern_buffer_limit: optional. This is a special safeguard parameter for BRAIN algorithm to limit internal temporary buffer to hold processed logs.


if it is optional, add default value in doc.

Done. Added default value.

penghuo · 2025-06-04T16:54:07Z

docs/user/ppl/cmd/patterns.rst


 or

-patterns [new_field=<new-field-name>] [pattern=<pattern>] <field> SIMPLE_PATTERN
+patterns <field> [by byClause...] pattern_method=SIMPLE_PATTERN [pattern_mode=LABEL | AGGREGATION] [pattern_max_sample_count=integer] [new_field=<new-field-name>] [pattern=<pattern>]


nit,
all options are under pattern command, we can simpliy it, for instance pattern_method -> method, pattern_mode -> mode

Renamed those options

penghuo · 2025-06-04T16:58:41Z

docs/user/ppl/cmd/patterns.rst


+* field: mandatory. The field must be a text field.
+* byClause: optional. The log groups to be labeled or aggregated. It could be fields and scalar functions.
+* pattern_method: optional. Specify pattern method to be brain. By default, it's simple_pattern if the setting ``plugins.ppl.default.pattern.method`` is not specified.


brain or BRAIN, is it case-sensitive?

I think it should be case-insensitive. @songkant-aws please double check. I suggest to use lower case in syntax doc.

It's case-insensitive. Now they are all in lower cases in syntax doc.

penghuo · 2025-06-04T17:00:26Z

docs/user/ppl/cmd/patterns.rst


+* field: mandatory. The field must be a text field.
+* byClause: optional. The log groups to be labeled or aggregated. It could be fields and scalar functions.
+* pattern_method: optional. Specify pattern method to be brain. By default, it's simple_pattern if the setting ``plugins.ppl.default.pattern.method`` is not specified.


By default, it's simple_pattern if the setting plugins.ppl.default.pattern.method is not specified.

The default value is configured by the setting plugins.ppl.default.pattern.method.

penghuo · 2025-06-04T17:01:09Z

docs/user/ppl/cmd/patterns.rst

+* field: mandatory. The field must be a text field.
+* byClause: optional. The log groups to be labeled or aggregated. It could be fields and scalar functions.
+* pattern_method: optional. Specify pattern method to be brain. By default, it's simple_pattern if the setting ``plugins.ppl.default.pattern.method`` is not specified.
+* pattern_mode: optional. label mode or aggregation mode. Default is label mode.


ditto, The default value is configured by the setting?

penghuo · 2025-06-04T17:06:44Z

docs/user/ppl/cmd/patterns.rst

+    +-------------------------------------------------------------------------+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+    | patterns_field                                                          | pattern_count | sample_logs                                                                                                                                                                                                                                                                                                                                                                                                               |
+    |-------------------------------------------------------------------------+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+    | <*IP*> - <*> [<*>/Sep/<*>:<*>:<*>:<*> <*>] <*> <*> HTTP/<*><*>" <*> <*> | 4             | [177.95.8.74 - upton5450 [28/Sep/2022:10:15:57 -0700] "HEAD /e-business/mindshare HTTP/1.0" 404 19927,127.45.152.6 - pouros8756 [28/Sep/2022:10:15:57 -0700] "GET /architectures/convergence/niches/mindshare HTTP/1.0" 100 28722,118.223.210.105 - - [28/Sep/2022:10:15:57 -0700] "PATCH /strategize/out-of-the-box HTTP/1.0" 401 27439,210.204.15.104 - - [28/Sep/2022:10:15:57 -0700] "POST /users HTTP/1.1" 301 9481] |


In aggregation mode, does the pattern command collect sample values of IP addresses?

What is the output syntax of the pattern_fields? Can it be used directly in search queries?

in IT, the detected pattern is PacketResponder failed <token1> blk_<token2> what does IP means, is it token?

Yes, when Calcite is enabled, the sample logs will be converted to sample tokens in different position.

pattern_field will be string in format like PacketResponder failed <token1> blk_<token2>. tokens will be a map like {token1: [...], token2: [...]}. Not sure what does it mean by using them directly in search queries?

<IP> is one of variable placeholder of BrainLogParser's output. Yes, it's token in V2 output format.

I have updated the syntax docs with more examples. When Calcite is enabled, the output syntax is a pattern string with <token*> placeholder plus a map of corresponding tokens. User can leverage those two output columns for further query.

Not sure what does it mean by using them directly in search queries?

For instance,
As user, the detected pattern is <token1> - <token2> [<token3>/Sep/<token4>:<token5>:<token6>:<token7> <token8>] <token9> <token10> HTTP/<token11><token12>\" <token13> <token14>, I want to search logs match this pattern.
I think it can not been directly used, need to rewise the query, it is out of scope this PR.

LantaoJin

Please update the code base and address the latest commends.

LantaoJin · 2025-06-07T02:13:34Z

docs/user/ppl/cmd/patterns.rst


+* field: mandatory. The field must be a text field.
+* byClause: optional. The log groups to be labeled or aggregated. It could be fields and scalar functions.
+* pattern_method: optional. Specify pattern method to be brain. By default, it's simple_pattern if the setting ``plugins.ppl.default.pattern.method`` is not specified.


I think it should be case-insensitive. @songkant-aws please double check. I suggest to use lower case in syntax doc.

LantaoJin · 2025-06-07T02:20:17Z

ppl/src/main/antlr/OpenSearchPPLLexer.g4

+PATTERN_MODE:                       'PATTERN_MODE';
+PATTERN_METHOD:                     'PATTERN_METHOD';
+PATTERN_MAX_SAMPLE_COUNT:           'PATTERN_MAX_SAMPLE_COUNT';
+PATTERN_BUFFER_LIMIT:               'PATTERN_BUFFER_LIMIT';


How above simplify the arguments by remove pattern_ prefix?

Removed pattern_ prefix

LantaoJin · 2025-06-07T02:23:56Z

common/src/main/java/org/opensearch/sql/common/setting/Settings.java

    DEFAULT_PATTERN_METHOD("plugins.ppl.default.pattern.method"),
+    DEFAULT_PATTERN_MODE("plugins.ppl.default.pattern.mode"),
+    DEFAULT_PATTERN_MAX_SAMPLE_COUNT("plugins.ppl.default.pattern.max.sample.count"),
+    DEFAULT_PATTERN_BUFFER_LIMIT("plugins.ppl.default.pattern.buffer.limit"),


Can we remove the default part? It's meaningless IMO.
plugins.ppl.default.pattern.method -> plugins.ppl.pattern.method

Removed default part

Signed-off-by: Songkan Tang <[email protected]>

penghuo · 2025-06-10T16:38:04Z

docs/user/ppl/cmd/patterns.rst

+* max_sample_count: optional. Max sample logs returned per pattern in aggregation mode (default: 10). The max_sample_count is configured by the setting ``plugins.ppl.pattern.max.sample.count``.
+* buffer_limit: optional. Safeguard parameter for ``brain`` algorithm to limit internal temporary buffer size (default: 100,000, min: 50,000). The buffer_limit is configured by the setting ``plugins.ppl.pattern.buffer.limit``.
+* new_field: Alias of the output pattern field. (default: "patterns_field").
+* algorithm parameters: optional. Algorithm-specific tuning:


nit, this line is in italic format, is it expected? https://github.com/opensearch-project/sql/blob/8f468a5b92b4b3a2ca5fb2798f78f329c88b4581/docs/user/ppl/cmd/patterns.rst#syntax

penghuo · 2025-06-10T16:39:02Z

docs/user/ppl/cmd/patterns.rst

+* new_field: Alias of the output pattern field. (default: "patterns_field").
+* algorithm parameters: optional. Algorithm-specific tuning:
+    - ``simple_pattern`` : Define regex via "pattern".
+    - ``brain`` : Adjust sensitivity with variable_count_threshold (int > 0) and frequency_threshold_percentage (double 0.0 - 1.0).


nit, explain what is variable_count_threshold and frequency_threshold_percentage

penghuo · 2025-06-10T16:47:55Z

docs/user/ppl/cmd/patterns.rst

+    +-------------------------------------------------------------------------+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+    | patterns_field                                                          | pattern_count | sample_logs                                                                                                                                                                                                                                                                                                                                                                                                               |
+    |-------------------------------------------------------------------------+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+    | <*IP*> - <*> [<*>/Sep/<*>:<*>:<*>:<*> <*>] <*> <*> HTTP/<*><*>" <*> <*> | 4             | [177.95.8.74 - upton5450 [28/Sep/2022:10:15:57 -0700] "HEAD /e-business/mindshare HTTP/1.0" 404 19927,127.45.152.6 - pouros8756 [28/Sep/2022:10:15:57 -0700] "GET /architectures/convergence/niches/mindshare HTTP/1.0" 100 28722,118.223.210.105 - - [28/Sep/2022:10:15:57 -0700] "PATCH /strategize/out-of-the-box HTTP/1.0" 401 27439,210.204.15.104 - - [28/Sep/2022:10:15:57 -0700] "POST /users HTTP/1.1" 301 9481] |


Not sure what does it mean by using them directly in search queries?

For instance,
As user, the detected pattern is <token1> - <token2> [<token3>/Sep/<token4>:<token5>:<token6>:<token7> <token8>] <token9> <token10> HTTP/<token11><token12>\" <token13> <token14>, I want to search logs match this pattern.
I think it can not been directly used, need to rewise the query, it is out of scope this PR.

penghuo · 2025-06-10T18:29:10Z

core/src/main/java/org/opensearch/sql/calcite/udf/udaf/LogPatternAggFunction.java

+import org.opensearch.sql.common.patterns.PatternUtils.ParseResult;
+
+public class LogPatternAggFunction implements UserDefinedAggFunction<LogParserAccumulator> {
+  private int bufferLimit = 100000;


does bufferLimit needed?

penghuo · 2025-06-10T18:43:47Z

core/src/main/java/org/opensearch/sql/calcite/udf/udaf/LogPatternAggFunction.java

+  }
+
+  public static class LogParserAccumulator implements Accumulator {
+    private final List<String> logMessages;


Access to logMessages is threadsafe?

songkant-aws added 9 commits April 16, 2025 11:31

Revert simple_pattern window function change to recover pushdown ability

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Signed-off-by: Songkan Tang <[email protected]>

Add SIMPLE_PATTERN patterns command support based on parse command

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Address minor comments

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Make allowCast for pattern VARCHAR literal

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Brain patterns command in Calcite with combined UDF and UDAF

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songkant-aws requested review from ps48, kavithacm, derek-ho, joshuali925, dai-chen, YANG-DB, mengweieric, Swiddis, penghuo, seankao-az, MaxKsyunz, Yury-Fridlyand, anirudha, forestmvey, acarbonetto, GumpacG, ykmr1224, LantaoJin, noCharger and qianheng-aws as code owners April 22, 2025 02:41

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songkant-aws added 6 commits May 23, 2025 15:47

Merge branch 'main' into calcite-patterns-command-brain-pattern-method

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Add 3570 yaml tests

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Fix plans in explain ITs

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songkant-aws requested review from LantaoJin and penghuo May 26, 2025 09:33

songkant-aws added 4 commits June 4, 2025 17:24

Merge branch 'main' into calcite-patterns-command-brain-pattern-method

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Merge branch 'main' into calcite-patterns-command-brain-pattern-method

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Reuse expand command plan to replace hacky uncollect_patterns UDTF

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Fix the issue of expand command plan executing main query twice

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Merge branch 'main' into calcite-patterns-command-brain-pattern-method

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		* pattern_max_sample_count: optional. The max sample logs to be returned per pattern in aggregation mode.
		* pattern_buffer_limit: optional. This is a special safeguard parameter for BRAIN algorithm to limit internal temporary buffer to hold processed logs.

Calcite patterns command brain pattern method #3570

Calcite patterns command brain pattern method #3570

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songkant-aws commented Apr 22, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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songkant-aws Jun 9, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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songkant-aws commented Apr 22, 2025 •

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