[jira] [Resolved] (IMPALA-4674) Port spilling ExecNodes to new buffer pool

["Tim Armstrong (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-4674?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong resolved IMPALA-4674.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: Impala 2.10.0



IMPALA-4674: Part 2: port backend exec to BufferPool

Always create global BufferPool at startup using 80% of memory and
limit reservations to 80% of query memory (same as BufferedBlockMgr).
The query's initial reservation is computed in the planner, claimed
centrally (managed by the InitialReservations class) and distributed
to query operators from there.

min_spillable_buffer_size and default_spillable_buffer_size query
options control the buffer size that the planner selects for
spilling operators.

Port ExecNodes to use BufferPool:
  * Each ExecNode has to claim its reservation during Open()
  * Port Sorter to use BufferPool.
  * Switch from BufferedTupleStream to BufferedTupleStreamV2
  * Port HashTable to use BufferPool via a Suballocator.

This also makes PAGG memory consumption more efficient (avoid wasting buffers)
and improve the spilling algorithm:
* Allow preaggs to execute with 0 reservation - if streams and hash tables
  cannot be allocated, it will pass through rows.
* Halve the buffer requirement for spilling aggs - avoid allocating
  buffers for aggregated and unaggregated streams simultaneously.
* Rebuild spilled partitions instead of repartitioning (IMPALA-2708)

TODO in follow-up patches:
* Rename BufferedTupleStreamV2 to BufferedTupleStream
* Implement max_row_size query option.

Testing:
* Updated tests to reflect new memory requirements

Change-Id: I7fc7fe1c04e9dfb1a0c749fb56a5e0f2bf9c6c3e
Reviewed-on: http://gerrit.cloudera.org:8080/5801
Reviewed-by: Tim Armstrong <ta...@cloudera.com>
Tested-by: Impala Public Jenkins


> Port spilling ExecNodes to new buffer pool
> ------------------------------------------
>
>                 Key: IMPALA-4674
>                 URL: https://issues.apache.org/jira/browse/IMPALA-4674
>             Project: IMPALA
>          Issue Type: Sub-task
>          Components: Backend
>    Affects Versions: Impala 2.8.0
>            Reporter: Tim Armstrong
>            Assignee: Tim Armstrong
>              Labels: resource-management
>             Fix For: Impala 2.10.0
>
>
> Once the buffer pool is functional we need to port the spilling exec nodes to use it and remove BufferedBlockMgr:
> # PartitionedHashJoinNode
> # PartitionedAggregationNode
> # SortNode
> # AnalyticEvalNode



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