Loading data examples

DataStax Bulk Loader for Apache Cassandra® supports the use of the dsbulk load, dsbulk unload, and dsbulk count commands with:

• DataStax Astra cloud databases
• DataStax Enterprise (DSE) 4.7 and later databases
• Open source Apache Cassandra® 2.1 and later databases

Load data from CSV data read from stdin to table table1 in keyspace ks1:

dsbulk load -k ks1 -t table1

Load a configuration file from /tmp/dsbulk_load.conf to use for loading the file export.csv to table table1 in keyspace ks1:

dsbulk load -f /tmp/dsbulk_load.conf --connector.csv.url export.csv -k ks1 -t table1

Load the file export.csv to table table1 in keyspace ks1 using the short form option for url:

dsbulk load -url export.csv -k ks1 -t table1

Load the file export.csv to table table1 in keyspace ks1 using the short form option for url and the tab character as a field delimiter:

dsbulk load -k ks1 -t table1 -url export.csv -delim '\t'

Load the file /tmp/export.csv to table table1 in keyspace ks1 using the long form option for url:

dsbulk load --connector.csv.url file:///tmp/export.csv -k ks1 -t table1

Load table table1 in keyspace ks1 from a gzipped CSV file by unzipping it to stdout and piping to stdin of dsbulk:

gzcat table1.csv.gz | dsbulk load -k ks1 -t table1

Specify a few hosts (initial contact points) that belong to the desired cluster and load from a local file, without headers. Map field indices of the input to table columns with -m:

dsbulk load -url ~/export.csv -k ks1 -t table1 -h '10.200.1.3, 10.200.1.4' -header false -m '0=col1,1=col3'

Specify port 9876 for the cluster hosts and load from an external source URL:

dsbulk load -url https://192.168.1.100/data/export.csv -k ks1 -t table1 -h '10.200.1.3,10.200.1.4' -port 9876

Load all csv files from a directory. The files do not have a header row, -header false. Map field indices of the input to table columns with -m:

dsbulk load -url ~/export-dir -k ks1 -t table1 -header false -m '0=col1,1=col3'

Specify a file that contains a list of multiple, well-formed URLs for the CSV or JSON data files to load:

dsbulk load --connector.json.urlfile "my/local/multiple-input-data-urls.txt" -k ks1 -t table1 -h '10.200.1.3'

Load data using a CQL query and include TTL values from the input data:

dsbulk load -query 
  "INSERT INTO dsbulkblog.iris_with_id
    (sepal_length,sepal_width,petal_length,petal_width,species,id) 
    VALUES (:sepal_length,:sepal_width,:petal_length,:petal_width,:species,:id) 
    USING TTL :ttl_to_use" 

Load data using a field-to-column mapping. The example also shows how a function call can be used to apply a function to one or more fields before mapping to a single column named odd_column:

dsbulk load 
  -url /tmp/dsbulkblog/iris.csv 
  -k dsbulkblog 
  -t iris_with_id 
  --schema.mapping "sepal_length = sepal_length, sepal_width = sepal_width, petal_length = petal_length, 
    petal_width = petal_width, species = species, id = id, max(sepal_length, petal_length) = odd_column"

With default port for cluster hosts, keyspace, table, and mapping set in conf/application.conf:

dsbulk load -url https://192.168.1.100/data/export.csv -h '10.200.1.3,10.200.1.4'

Load table table1 in keyspace ks1 from a CSV file, where double-quote characters in fields are escaped with a double-quote; for example, "f1","value with ""quotes"" and more" is a line in the CSV file:

dsbulk load -url ~/export.csv -k ks1 -t table1 -escape '\"'

Loading collections to a table has some specific helpful simplification. Collections inside a CSV file can contain valid JSON or simpler non-compliant JSON. For example, for the following table:

CREATE TABLE t1 (col1 set<int> PRIMARY KEY, col2 list<int>, col3 map<text,int>);

This pipe-delimited CSV file contains valid JSON and could be loaded:

col1|col2|col3
[1,2,3]|[1,2,3]|{"key1":1,"key2":2}

Or, you could load the same CSV file as follows:

col1|col2|col3
1,2,3|1,2,3|"key1":1,"key2":2

Notice that the surrounding brackets and braces are omitted from the valid JSON in the third column.

col1,col2,col3,col4
[1,2,3]|[1,2,3]|{"key1":1,"key2":2}|[[1,2,3],[4,5,6]]

col1,col2,col3,col4
1,2,3|1,2,3|"key1":1,"key2":2|[1,2,3],[4,5,6]