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https://issues.apache.org/jira/browse/TRAFODION-3192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596661#comment-16596661
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Sandhya Sundaresan commented on TRAFODION-3192:
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|an old email showing other queue resizing:
From: Eric Owhadi
Sent: Monday, September 11, 2017 3:25 PM
To: Sandhya Sundaresan
<[[email protected]|mailto:[email protected]]>; Hans
Zeller <[[email protected]|mailto:[email protected]]>; Suresh Subbiah
<[[email protected]|mailto:[email protected]]>; Anoop Sharma
<[[email protected]|mailto:[email protected]]>
Subject: RE: update path may need some work?
I have seen queue sizing issues on couple of places.
cqd GEN_DP2I_SIZE_DOWN '1024';
cqd UPD_ORDERED 'OFF';
cqd HBASE_ROWSET_VSBB_SIZE '20480';
for an upsert using load-under performing clearly because auto sizing was not
kickin-in (this is for my bottle of wine bet with Hans POC ).
and queue of a UNION ALL operator in my HotCold also failing to resize, had to
hardcode it using CQD
cqd gen_un_size_up '2048';
cqd gen_un_size_down '2048';
So given the queueing mechanism is in a shared class inherited by many
operator, it would not surprise me if a common issue affecting multiple
operators? It would not surprise me that if people start looking at dispatch
metrics, this would be a widespread problem,
\|
> UNION ALL up and down queue size default value too small, or not dynamically
> adjusted
> -------------------------------------------------------------------------------------
>
> Key: TRAFODION-3192
> URL: https://issues.apache.org/jira/browse/TRAFODION-3192
> Project: Apache Trafodion
> Issue Type: Bug
> Components: sql-exe
> Affects Versions: any
> Reporter: Sandhya Sundaresan
> Assignee: Sandhya Sundaresan
> Priority: Major
> Fix For: 2.4
>
>
> The union up queue size is hardcoded in nadefaults.cpp as a start value as 16
> which
> is very low if large number of rows are being returned. Scan operator has it
> set to 2048.
> Some operators further adjust this up size from the original value based on
> estimate of
> the number of rows being returned. We can do that for union codegen method and
> also change the original up queue size to 2048.
>
> Noticed that Transpose, Sequence also have the same issue and dynamic queue
> resizing is missing.
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