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Hi，
The advantage of Parquet is that it only scans the required columns, it is a
file in a column storage format.
The fewer columns you select, the less memory is required.
Developers do not need to care about the details of loading data, they are
well-designed and imperceptible to users.
SEE:http://spark.apache.org/docs/2.3.1/streaming-programming-guide.html#checkpointing
"Note that checkpointing of RDDs incurs the cost of saving to reliable storage.
This may cause an increase in the processing time of those batches where RDDs
get checkpointed."
As far as I know, the
No wonder I said why I can't understand what the mail expresses, it feels like
a joke……
在 2020-04-16 02:28:49，seemanto.ba...@nomura.com.INVALID 写道：
Have we been tricked by a bot ?
From: Matt Smith
Sent: Wednesday, April 15, 2020 2:23 PM
To: jane thorpe
Cc:
