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https://issues.apache.org/jira/browse/HIVE-4963?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Phabricator updated HIVE-4963:
------------------------------
Attachment: HIVE-4963.D12279.1.patch
hbutani requested code review of "HIVE-4963 [jira] Support in memory PTF
partitions".
Reviewers: JIRA, ashutoshc
fix lint issues
PTF partitions apply the defensive mode of assuming that partitions will not
fit in memory. Because of this there is a significant deserialization overhead
when accessing elements.
Allow the user to specify that there is enough memory to hold partitions
through a 'hive.ptf.partition.fits.in.mem' option.
Savings depends on partition size and in case of windowing the number of UDAFs
and the window ranges. For eg for the following (admittedly extreme) case the
PTFOperator exec times went from 39 secs to 8 secs.
select t, s, i, b, f, d,
min(t) over(partition by 1 rows between unbounded preceding and current row),
min(s) over(partition by 1 rows between unbounded preceding and current row),
min(i) over(partition by 1 rows between unbounded preceding and current row),
min(b) over(partition by 1 rows between unbounded preceding and current row)
from over10k
TEST PLAN
EMPTY
REVISION DETAIL
https://reviews.facebook.net/D12279
AFFECTED FILES
ql/src/java/org/apache/hadoop/hive/ql/exec/PTFOperator.java
ql/src/java/org/apache/hadoop/hive/ql/exec/PTFPartition.java
ql/src/java/org/apache/hadoop/hive/ql/exec/PTFPersistence.java
ql/src/java/org/apache/hadoop/hive/ql/exec/persistence/PTFRowContainer.java
ql/src/java/org/apache/hadoop/hive/ql/exec/persistence/RowContainer.java
ql/src/java/org/apache/hadoop/hive/ql/parse/PTFTranslator.java
ql/src/java/org/apache/hadoop/hive/ql/plan/PTFDesc.java
ql/src/java/org/apache/hadoop/hive/ql/plan/PTFDeserializer.java
ql/src/java/org/apache/hadoop/hive/ql/udf/ptf/TableFunctionEvaluator.java
ql/src/java/org/apache/hadoop/hive/ql/udf/ptf/TableFunctionResolver.java
ql/src/java/org/apache/hadoop/hive/ql/udf/ptf/WindowingTableFunction.java
MANAGE HERALD RULES
https://reviews.facebook.net/herald/view/differential/
WHY DID I GET THIS EMAIL?
https://reviews.facebook.net/herald/transcript/29349/
To: JIRA, ashutoshc, hbutani
> Support in memory PTF partitions
> --------------------------------
>
> Key: HIVE-4963
> URL: https://issues.apache.org/jira/browse/HIVE-4963
> Project: Hive
> Issue Type: Bug
> Components: PTF-Windowing
> Reporter: Harish Butani
> Attachments: HIVE-4963.D11955.1.patch, HIVE-4963.D12279.1.patch,
> PTFRowContainer.patch
>
>
> PTF partitions apply the defensive mode of assuming that partitions will not
> fit in memory. Because of this there is a significant deserialization
> overhead when accessing elements.
> Allow the user to specify that there is enough memory to hold partitions
> through a 'hive.ptf.partition.fits.in.mem' option.
> Savings depends on partition size and in case of windowing the number of
> UDAFs and the window ranges. For eg for the following (admittedly extreme)
> case the PTFOperator exec times went from 39 secs to 8 secs.
>
> {noformat}
> select t, s, i, b, f, d,
> min(t) over(partition by 1 rows between unbounded preceding and current row),
> min(s) over(partition by 1 rows between unbounded preceding and current row),
> min(i) over(partition by 1 rows between unbounded preceding and current row),
> min(b) over(partition by 1 rows between unbounded preceding and current row)
> from over10k
> {noformat}
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