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https://issues.apache.org/jira/browse/IMPALA-4835?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-4835.
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Resolution: Fixed
Fix Version/s: Impala 3.1.0
Impala 2.13.0
> HDFS scans should operate with a constrained number of I/O buffers
> ------------------------------------------------------------------
>
> Key: IMPALA-4835
> URL: https://issues.apache.org/jira/browse/IMPALA-4835
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 2.9.0
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
> Labels: resource-management
> Fix For: Impala 2.13.0, Impala 3.1.0
>
>
> The HDFS scan nodes should be able to operate with a fixed number of I/O
> buffers in most cases (excluding very large rows). We should modify them to
> claim a reservation upfront and use this for all disk I/O.
> This probably also requires switching DiskIoMgr to allocate memory from
> BufferPool.
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