Frame export_to_hbase

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export_to_hbase(self, table_name, key_column_name=None, family_name=None)

Write current frame to HBase table.

Parameters:

table_name : unicode

The name of the HBase table that will contain the exported frame

key_column_name : unicode (default=None)

The name of the column to be used as row key in hbase table

family_name : unicode (default=None)

The family name of the HBase table that will contain the exported frame

Table must exist in HBase. Export of Vectors is not currently supported.

Examples

Overwrite/append scenarios (see below):

1. create a simple hbase table from csv

   load csv into a frame using existing frame api save the frame into hbase (it creates a table - lets call it table1)

2. overwrite existing table with new data

   do scenario 1 and create table1 load the second csv into a frame save the frame into table1 (old data is gone)

3. append data to the existing table 1

   do scenario 1 and create table1 load table1 into frame1 load csv into frame2 let frame1 = frame1 + frame2 (concatenate frame2 into frame1) save frame1 into base as table1 (overwrite with initial + appended data)

Vector scenarios (see below):

Vectors are not directly supported by HBase (which represents data as byte arrays) or the plugin. While is true that a vector can be saved because of the byte array conversion for hbase, the following is actually the recommended practice:

1. Convert the vector to csv (in python, outside ATK)
2. save the csv as string in the database (using ATK export_to_hbase)
3. read the cell as string (using ATK, read from hbase
4. convert the csv to vector (in python, outside ATK)