Help Center/ MapReduce Service/ Component Operation Guide (LTS) (Paris Region)/ Using CarbonData/ Overview/ Main Specifications of CarbonData
Updated on 2022-12-14 GMT+08:00
View PDF
Share

Main Specifications of CarbonData

Main Specifications of CarbonData

Table 1 Main Specifications of CarbonData

Entity

Tested Value

Test Environment

Number of tables

10000

3 nodes. 4 vCPUs and 20 GB memory for each executor. Driver memory: 5 GB, 3 executors.

Total columns: 107

String: 75

Int: 13

BigInt: 7

Timestamp: 6

Double: 6

Number of table columns

2000

3 nodes. 4 vCPUs and 20 GB memory for each executor. Driver memory: 5 GB, 3 executors.

Maximum size of a raw CSV file

200GB

17 cluster nodes. 150 GB memory and 25 vCPUs for each executor. Driver memory: 10 GB, 17 executors.

Number of CSV files in each folder

100 folders. Each folder has 10 files. The size of each file is 50 MB.

3 nodes. 4 vCPUs and 20 GB memory for each executor. Driver memory: 5 GB, 3 executors.

Number of load folders

10000

3 nodes. 4 vCPUs and 20 GB memory for each executor. Driver memory: 5 GB, 3 executors.

The memory required for data loading depends on the following factors:

  • Number of columns
  • Column values
  • Concurrency (configured using carbon.number.of.cores.while.loading)
  • Sort size in memory (configured using carbon.sort.size)
  • Intermediate cache (configured using carbon.graph.rowset.size)

Data loading of an 8 GB CSV file that contains 10 million records and 300 columns with each row size being about 0.8 KB requires about 10 GB executor memory. That is, set carbon.sort.size to 100000 and retain the default values for other parameters.

Table Specifications

Table 2 Table specifications

Entity

Tested Value

Number of secondary index tables

10

Number of composite columns in a secondary index table

5

Length of column name in a secondary index table (unit: character)

120

Length of a secondary index table name (unit: character)

120

Cumulative length of all secondary index table names + column names in an index table* (unit: character)

3800**
  • * Characters of column names in an index table refers to the upper limit allowed by Hive or the upper limit of available resources.
  • ** Secondary index tables are registered using Hive and stored in HiveSERDEPROPERTIES in JSON format. The value of SERDEPROPERTIES supported by Hive can contain a maximum of 4,000 characters and cannot be changed.
Parent topic: Overview