[jira] [Commented] (SPARK-9973) Wrong initial size of in-memory columnar buffers

["Cheng Lian (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-9973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14698553#comment-14698553 ] 

Cheng Lian commented on SPARK-9973:
-----------------------------------

I've updated the title and description.

> Wrong initial size of in-memory columnar buffers
> ------------------------------------------------
>
>                 Key: SPARK-9973
>                 URL: https://issues.apache.org/jira/browse/SPARK-9973
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.5.0
>            Reporter: xukun
>            Assignee: xukun
>
> Two much memory is allocated for in-memory columnar buffers. The {{initialSize}} argument in {{ColumnBuilder.initialize}} is the initial number of rows rather than bytes, but the value passed in in {{InMemoryColumnarTableScan}} is the latter:
> {code}
> // Class InMemoryColumnarTableScan
>   val initialBufferSize = columnType.defaultSize * batchSize
>   ColumnBuilder(attribute.dataType, initialBufferSize, attribute.name, useCompression)
> {code}
> Then it's converted to byte size again by multiplying {{columnType.defaultSize}}:
> {code}
> // Class BasicColumnBuilder
>   buffer = ByteBuffer.allocate(4 + size * columnType.defaultSize)
> {code}



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