[jira] [Updated] (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:all-tabpanel ]

Cheng Lian updated SPARK-9973:
------------------------------
    Summary: Wrong initial size of in-memory columnar buffers  (was: wrong buffle size)

> 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
>            Reporter: xukun
>            Assignee: xukun
>
> When cache table in memory in spark sql, we allocate too more memory.
> InMemoryColumnarTableScan.class
>   val initialBufferSize = columnType.defaultSize * batchSize
>   ColumnBuilder(attribute.dataType, initialBufferSize, attribute.name, useCompression)
> BasicColumnBuilder.class
>   buffer = ByteBuffer.allocate(4 + size * columnType.defaultSize)
> So total allocate size is (4+ size * columnType.defaultSize  * columnType.defaultSize), We change it to 4+ size * columnType.defaultSize.



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