Can someone file a bug report for me

mattlucas719 — Wed, 30 Sep 2020 00:18:04 GMT

i don't have an active license but i want to file a bug report for this logic string/number issue i noticed in both "search and where"

| metadata type=hosts index=_internal
| stats max(recentTime) as latest by host
| eval last_heartbeat=strftime(latest,"%F %T")
| eval time_now=now()
| eval "last_log_seconds"= ( time_now - latest )
| stats count by host last_log_seconds, last_heartbeat
| where last_log_seconds > "3600"
| fields - count

run that in your splunk environment and you'll see that it returns invalid results, but when you remove the quotes around the number it works fine.

| metadata type=hosts index=_internal
| stats max(recentTime) as latest by host
| eval last_heartbeat=strftime(latest,"%F %T")
| eval time_now=now()
| eval "last_log_seconds"= ( time_now - latest )
| stats count by host last_log_seconds, last_heartbeat
| where last_log_seconds > 3600
| fields - count

Splunk Cloud

Splunk Version
7.0.8.5
Splunk Build
c3e02dedf40a

Re: Can someone file a bug report for me

niketn — Mon, 29 Apr 2019 17:11:18 GMT

@mattlucas719 this is not a bug, this is an expected behavior of number represented as string. For your use case you should be comparing last_log_seconds>3600.

Try out the following two run anywhere searches.

1) Sorts by numeric data i.e. 1,2,10,20

|  makeresults
|  eval data="1,10,2,20"
|  makemv data delim=","
|  mvexpand data
|  eval data_string="str".data
|  sort data

2) Sorts by string data i.e. 1,10,2,20

|  makeresults
|  eval data="1,10,2,20"
|  makemv data delim=","
|  mvexpand data
|  eval data_string="str".data
|  sort data_string

On similar lines as above if you apply

filter | search data>=2, it will do numeric filter, returning 2,10,20:

|  makeresults
|  eval data="1,10,2,20"
|  makemv data delim=","
|  mvexpand data
|  search data>=2

and filter | search data>="2", will do string filter, returning 2,20:

|  makeresults
|  eval data="1,10,2,20"
|  makemv data delim=","
|  mvexpand data
|  search data>="2"

Hope this clarifies behavior.

PS: While it does not matter much with metadata command however, as a performance optimization suggestion, you should apply the filter before stats. Try the following search with metadata:

| metadata type=sourcetypes index=_internal
| stats max(recentTime) as last_heartbeat by sourcetype
| eval "last_log_seconds"= ( now() - last_heartbeat ) 
| search last_log_seconds > 3600
| stats count by sourcetype, last_log_seconds, last_heartbeat
| fields - count
| fieldformat last_heartbeat=strftime(last_heartbeat,"%F %T")

If you are maintaining a lookup/kvstore of all hosts, you can refer to Splunk Documentation to do something similar using tstats and addinfo command as well (example uses expected_hosts lookup):

| tstats latest(_time) as latest_time where index=_internal by host 
| addinfo 
| eval latest_age = info_max_time - latest_time 
| fields - info_*
| inputlookup append=t expected_hosts 
| fillnull value=9999 latest_age 
| dedup host 
| where latest_age > 42

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Can someone file a bug report for me

Re: Can someone file a bug report for me