question Re: Timestamp Format Issue (NiFi's PutDatabaseRecord) in Support Questions

Timestamp Format Issue (NiFi's PutDatabaseRecord)

lauritz — Wed, 13 Nov 2019 06:07:17 GMT

Getting error when inserting a csv-file into a MSSQL database using the PutDatabaseRecord (1.9.2) processor in Nifi.

ListFile → FetchFile → PutDatabaseRecord

The schema used:

{ "type" : "record", "name" : "mibas_t005_talkgroup", "fields" : [ { "name" : "talkgroup_ref", "type" : ["null","long"] }, { "name" : "fleet_ref", "type" : ["null","long"] }, { "name" : "talkgroup_id", "type" : ["null","long"] }, { "name" : "talkgroup_name", "type" : ["null","string"] }, { "name" : "group_type", "type" : ["null","string"] }, { "name" : "dispatcher_ref", "type" : ["null","string"] }, { "name" : "multigroup_ref", "type" : ["null","string"] }, { "name" : "owner_", "type" : ["null","string"] }, { "name" : "fne_state", "type" : ["null","string"] }, { "name" : "addl_attrvar", "type" : ["null","string"] }, { "name" : "last_user_modified", "type" : ["null","string"] }, { "name" : "time_stamp", "type" : ["null", { "type":"long", "logicaltype":"timestamp-millis"} ]}, { "name" : "fne_oid", "type" : ["null","string"] }]}

Datatype in the table is DateTime

Re: Timestamp Format Issue (NiFi's PutDatabaseRecord)

DennisJaheruddi — Thu, 14 Nov 2019 13:49:29 GMT

It seems that the PutDatabaseRecord processor expects your timestamp to be numeric (probably milliseconds since the epoch).

I notice your screenshot contains a specification of the timestamp format, but I don't see this as an option in the documentation, so possibly that has no effect in this processor.

Here is the reference: https://nifi.apache.org/docs/nifi-docs/components/org.apache.nifi/nifi-standard-nar/1.9.2/org.apache.nifi.processors.standard.PutDatabaseRecord/index.html

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Possible solution: Load or convert the timestamp to the right value.

A simple trick to check what the value should be, is by manually inserting a date into the table, loading it with Nifi and then inspecting the value.

(You can also test writing it back, that should confirm that the value works).

Re: Timestamp Format Issue (NiFi's PutDatabaseRecord)

lauritz — Fri, 15 Nov 2019 10:43:42 GMT

Thank you for your reply!
The timestamp format is an option in the CSVReader Controller Service, which is a valid service

record reader in the PutDatabaseRecord processor. The format used, is working fine in other workflows with the same setup.

Re: Timestamp Format Issue (NiFi's PutDatabaseRecord)

DennisJaheruddi — Fri, 15 Nov 2019 13:00:17 GMT

I see, as there are several steps here it is a bit hard to pinpoint the problem. Please check what the timestamp looks like just before you write it to the database. If it still looks like a string, presumably something went wrong with the reading.

Re: Timestamp Format Issue (NiFi's PutDatabaseRecord)

lauritz — Wed, 04 Dec 2019 13:45:35 GMT

The solution was changing the datatype definition in the schema from logicaltype to logicalType (Upper case T there for you). wtf!!!

Eg: *{ "name" : "time_stamp", "type" : ["null", { "type":"long", "logicalType":"timestamp-millis"}*

The irritating part is that the schema validates. No warning! But, if you mistakenly use String instead of the correct string (lower case S) or Type instead of type in you schema, your schema will not validate and you can correct it. But for logicalType no.

Re: Timestamp Format Issue (NiFi's PutDatabaseRecord)

DennisJaheruddi — Wed, 04 Dec 2019 14:08:01 GMT

I understand this was hard to find.

One point that is not relevant now, but may help with the general understanding:

If you make a typo in the field names, avro will just ignore the actions of the right field and instead process the new field, which will be empty.

This is technically quite a different problem than when you actually make a typo in the Type, as those are possible to check against the list of possible types.

So detection of typos in field names is hard, and despite what the name suggests it seems LogicalType is actually a field name from Nifi perspective.