GROK Multiline log parsing

[daggumalli]

I am trying to parse multiline logs using GROK.. but the result omitting new line. Example code below.

String log = "a|b|c|d"+"\n"+"e";
Pattern = (?m)(?<ErrMsg>.*)

Output is = ErrMsg = a|b|c|d

Any help would be appreicated!!!

[ottobackwards]

This is because the .* pattern without the DOTALL doesn't evaluate past the newline.

[ottobackwards]

I was able to get your sample to work with (?m)(?<ErrMsg>.*\\R.*)"

[gruselglatz]

I try to achieve to parse this log, with nifi which uses this lib. but i fail all the time:
In kibana and Graylog its working fine, but not with nifi. Can i trick it into not stopping at the End of a line. The (?m) flag doesn't help strangely.

2019-09-24 08:52:46,881 [INFO ] 00000000 Dashboard loading performance: 
	beforeLoadingComponentsAndPrompts: 1042 ms
	dashboardComponentsCreated: 2082 ms
	dashboardInitialContentLinkingComplete: 2160 ms
	dashboardInitialRenderComplete: 3285 ms
	path: /public/Dashboards/PVP/PVP_Einstieg_MO/PVP_Einstieg_MO.stdb
	browser: Chrome 79
	httpRequestCount: 32
	hasInputFilters: false
	InputComponentCount: 1
	TableComponentCount: 1
	CDFComponentCount: 1
	PreselectComponentCount: 2
	ContentGenerator: 55 ms
	CreateChartConfig (F2): 21 ms
	CreateChartConfig (F1): 14 ms
	Get CDA Parameter from CDA file (F2): 2 ms
	UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3920.0 Safari/537.36
 [https-openssl-nio-9085-exec-547] (ams.plugin.api.LoggingAPI) 

[ottobackwards]

No, Nifi literally reads line by line and passes each line to grok. If you are using Nifi what you could think of doing is using another processor to modify the content, like replacing "\n" with "|" or something, and then modifying your grok to account for the change. ReplaceText processes could do this

[gruselglatz]

tried pretty much everything, but the problem is that it's in the flowfile between normal logs.
Do you know some magic to extract only this log from the others?

i tried it with nearly everything i found online and created this regex which should extract only this messages, but nifi handles it different and now I think i resign -.-

(^\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d{3}\s\[.*\s{0,3}\]\s\d{8}\sDashboard\sloading\sperformance:.*(?:(?:\r\n|[\r\n])(?!\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d{3}\s\[.*\s{0,3}\]\s\d{8}).*)*(?:\r\n|[\r\n])?)

Is there not a single option to enable multiline in nifi grok? or can i fork it and recompile a new processor with this option enabled? (I am no java dev :( )

[ottobackwards]

Again: https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-services/nifi-record-serialization-services-bundle/nifi-record-serialization-services/src/main/java/org/apache/nifi/grok/GrokRecordReader.java#L85 It reads it line by line. There is no work around *in* the record reader. You can create an issue in the nifi jira, attaching a sanitized sample file / data that can be used to test the parsing, and a flow template if you can. I would *think* you’d be looking at a flow like [source] —> flow file with multiple multi line things delimited by ??? ( empty line? ) -> SplitContent or something -> one flow file per entry -> ReplaceText get rid of new lines -> ???? with the grok record reader -> ???? -> Profit On September 26, 2019 at 08:51:58, herbert (notifications@github.com) wrote: tried pretty much everything, but the problem is that it's in the flowfile between normal logs. Do you know some magic to extract only this log from the others? i tried it with nearly everything i found online and created this regex which should extract only this messages, but nifi handles it different and now I think i resign -.- (^\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d{3}\s\[.*\s{0,3}\]\s\d{8}\sDashboard\sloading\sperformance:.*(?:(?:\r\n|[\r\n])(?!\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d{3}\s\[.*\s{0,3}\]\s\d{8}).*)*(?:\r\n|[\r\n])?) Is there not a single option to enable multiline in nifi grok? or can i fork it and recompile a new processor with this option enabled? (I am no java dev :( ) — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#102?email_source=notifications&email_token=AAIPL7ZNHPVFVSDVNM7EZ6DQLSV65A5CNFSM4FN2NOK2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD7VOKVI#issuecomment-535487829>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAIPL752JJOQ3HW3HC3FYZDQLSV65ANCNFSM4FN2NOKQ> .

[ottobackwards]

You can also try posting to the users@nifi.apache.org list On September 26, 2019 at 10:21:21, Otto Fowler (ottobackwards@gmail.com) wrote: Again: https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-services/nifi-record-serialization-services-bundle/nifi-record-serialization-services/src/main/java/org/apache/nifi/grok/GrokRecordReader.java#L85 It reads it line by line. There is no work around *in* the record reader. You can create an issue in the nifi jira, attaching a sanitized sample file / data that can be used to test the parsing, and a flow template if you can. I would *think* you’d be looking at a flow like [source] —> flow file with multiple multi line things delimited by ??? ( empty line? ) -> SplitContent or something -> one flow file per entry -> ReplaceText get rid of new lines -> ???? with the grok record reader -> ???? -> Profit On September 26, 2019 at 08:51:58, herbert (notifications@github.com) wrote: tried pretty much everything, but the problem is that it's in the flowfile between normal logs. Do you know some magic to extract only this log from the others? i tried it with nearly everything i found online and created this regex which should extract only this messages, but nifi handles it different and now I think i resign -.- (^\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d{3}\s\[.*\s{0,3}\]\s\d{8}\sDashboard\sloading\sperformance:.*(?:(?:\r\n|[\r\n])(?!\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d{3}\s\[.*\s{0,3}\]\s\d{8}).*)*(?:\r\n|[\r\n])?) Is there not a single option to enable multiline in nifi grok? or can i fork it and recompile a new processor with this option enabled? (I am no java dev :( ) — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#102?email_source=notifications&email_token=AAIPL7ZNHPVFVSDVNM7EZ6DQLSV65A5CNFSM4FN2NOK2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD7VOKVI#issuecomment-535487829>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAIPL752JJOQ3HW3HC3FYZDQLSV65ANCNFSM4FN2NOKQ> .