tablewriter | ASCII table in golang | Graphics library
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kandi X-RAY | tablewriter Summary
ASCII table in golang
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QUESTION
Create table -
...ANSWER
Answered 2021-Aug-11 at 10:16it's interesting change in 2.5.x, that I wasn't aware of - you now need to have a correct row size even if keyColumns
is specified, it worked without it before - looks like a bug for me.
You need to leave only the primary key when deleting the whole row - change delete to the:
QUESTION
I've been through the Spark docs but unsure as to how to to save a Java bean into a table using the Spark Cassandra Connector?
...ANSWER
Answered 2021-Feb-22 at 18:56This took a bit of pokningg around but turned out to be like so:
QUESTION
I am trying to receive tweet object using tweepy library, using Apache Kafka and Apache Spark I am trying to stream and transform json tweet object into structured format than insert it to cassandra db.
My data pipeline like below;
I have 2 .py file
- kafka_tweet_producer.py
Written to receive tweet object filtered by desired hashtag and stream with Kafka.
- twitter_structured_stream_spark_kafka_cassandra.py
Written to create spark session to read from kafka, transform json into structured format and finally Insert those data into Cassandra db.
I filtered tweets with my own name. Then I wrote few tweets using my pc. I saw below result;
Then I sent 1 more tweet via my mobile phone and spark session died with below error message;
...ANSWER
Answered 2021-Mar-03 at 16:05Not sure exactly what's happening, but I'd bet it has to do with null values. Usually, the Cassandra drivers utilize an "unset" capability to ensure that nulls in prepared statements don't make it into the database. After all in Cassandra null
==DELETE
==tombstone.
when I receive tweet from mobile phone id column becomes null which is primary column.
Yes, that's got to be it. The primary key components cannot be null in Cassandra. Get that sent along properly, and you should be ok.
Note: When querying Cassandra using tools like cqlsh
and showing a column which doesn't have a value, null
will appear. That doesn't mean that a null value is actually there. Showing null
is Cassandra's way of saying "no data."
QUESTION
Inside docker, it seems that I cannot compile my gRPC micro-service due to this error:
...ANSWER
Answered 2020-Sep-07 at 00:39The gist of this error is that the version of binary used to generate the code isn't compatible with the current version of code. A quick and easy solution would be to try updating the protoc-gen-go
compiler and the gRPC library to the latest version.
go get -u github.com/golang/protobuf/protoc-gen-go
then regen the proto
heres a link to a reddit thread that discusses the issue
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