Hi team, I have a question regarding

tableIndexConfig

for

dimension

tables. 1. If we don’t specify the

loadMode

in

tableIndexConfig

, is

HEAP

the default load mode? 2. If we specify the

loadMode

in

tableIndexConfig

, will it overwrite the default load mode?

"tableIndexConfig": {
    "invertedIndexColumns": [],
    "loadMode": "MMAP"
  },

@Zhengfei 1. looking at the code in

TableConfigBuilder

,

HEAP

seems like the default load mode. However, the

IndexLoadingConfig

is actually using the

ReadMode.DEFAULT_MODE

which turns out to be

mmap

. I think the latter is the source of truth. Not sure why the default in

TableConfigBuilder

is

HEAP

. cc: @Jackie 2. If you configure

loadMode

in

tableIndexConfig

, it will use that instead of the default.

Ok, thanks!

ReadMode.DEFAULT_MODE

which turns out to be

mmap

is the the code? https://github.com/apache/pinot/blob/release-0.12.1/pinot-spi/src/main/java/org/apache/pinot/spi/utils/CommonConstants.java#L497

@Navina

TableConfigBuilder

is just a tool to build table config and is mostly used by the test. We probably missed it when changing the default load mode, and we can change it to use

MMAP

as the default