[PHOENIX-3570] Data load gets 5-7X slower with mutable sparse columns

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Fix Version/s: 4.10.0
• Assignee: Samarth Jain
• Reporter: Mujtaba Chohan
• Created: 05/Jan/17 19:45
• Updated: 06/Jan/17 00:42
• Resolved: 06/Jan/17 00:42

Description

Schema with 5K columns

create table (k1 integer, k2 integer, column_1 varchar ... column_5000 varchar CONSTRAINT PK PRIMARY KEY (K1, K2)) 
VERSIONS=1, MULTI_TENANT=true, IMMUTABLE_ROWS=FALSE

In this mutable schema, only 100 random columns are filled with random 15 chars. Rest are nulls.

Using a batch size of 1000 with single client/single thread. Time it takes to load data is 5-7X slower compared to standard non-encoded format.