[
https://issues.apache.org/jira/browse/SQOOP-1976?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Qian Xu updated SQOOP-1976:
---------------------------
Description: SQOOP-1836 introduced a new method {{getColumnsArray}}. As the
class {{Schema}} is used very often, the idea is to provide a constant (better)
lookup time for particular column. But I think the implementation will create
array from a list for every call, it will be even slower than accessing the
original {{getColumnsList}} in some cases. I think we can change the type of
columns from {{LinkedList}} to {{ArrayList}}, which is included in SQOOP-1969.
The jira proposes to remove {{getColumnsArray}}. (was: SQOOP-1836 introduced a
new method {{getColumnsArray}}. As the class {{Schema}} is used very often, the
idea is to provide a constant (better) lookup time for particular column. But I
think the implementation will create array from a list for every call, it will
be slower than accessing {{getColumnsList}}. SQOOP-1969 has already changed the
columns from {{LinkedList}} to {{ArrayList}}, there is not necessary to have a
{{getColumnsArray}} anymore.)
> Sqoop2: Avoid massive in-memory copy of schema column
> -----------------------------------------------------
>
> Key: SQOOP-1976
> URL: https://issues.apache.org/jira/browse/SQOOP-1976
> Project: Sqoop
> Issue Type: Improvement
> Reporter: Qian Xu
> Assignee: Qian Xu
>
> SQOOP-1836 introduced a new method {{getColumnsArray}}. As the class
> {{Schema}} is used very often, the idea is to provide a constant (better)
> lookup time for particular column. But I think the implementation will create
> array from a list for every call, it will be even slower than accessing the
> original {{getColumnsList}} in some cases. I think we can change the type of
> columns from {{LinkedList}} to {{ArrayList}}, which is included in
> SQOOP-1969. The jira proposes to remove {{getColumnsArray}}.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
