问题
I have tried copying cassandra table data to an external .dat file. For few rows it works fine.
echo "select * from <schema>.events limit 5000 ;" | /home.../bin/cqlsh > output.dat
But when I do the same for some millions of rows, it is taking time. Say, 5,00,000 rows takes 4 mins.
I have to do selective copy of data around 3,00,00,000 rows on incremental. Any help would be much appreciated.
回答1:
Try to use COPY command to copy cassandra table data to some external file.
来源：https://stackoverflow.com/questions/35332538/selective-copy-cassandra-million-rows-data-to-external-file