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https://issues.apache.org/jira/browse/SQOOP-1968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14266059#comment-14266059
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Sqoop QA bot commented on SQOOP-1968:
-------------------------------------
Testing file
[SQOOP-1968.2.patch|https://issues.apache.org/jira/secure/attachment/12690332/SQOOP-1968.2.patch]
against branch sqoop2 took 0:26:47.199142.
{color:green}Overall:{color} +1 all checks pass
{color:green}SUCCESS:{color} Clean was successful
{color:green}SUCCESS:{color} Patch applied correctly
{color:green}SUCCESS:{color} Patch add/modify test case
{color:green}SUCCESS:{color} License check passed
{color:green}SUCCESS:{color} Patch compiled
{color:green}SUCCESS:{color} All unit tests passed
{color:green}SUCCESS:{color} All integration tests passed
Console output is available
[here|https://builds.apache.org/job/PreCommit-SQOOP-Build/883/console].
This message is automatically generated.
> Optimize schema operation in getMatchingData of NameMatcher
> -----------------------------------------------------------
>
> Key: SQOOP-1968
> URL: https://issues.apache.org/jira/browse/SQOOP-1968
> Project: Sqoop
> Issue Type: Improvement
> Components: connectors/generic
> Affects Versions: 2.0.0
> Reporter: Jerry Chen
> Assignee: Qian Xu
> Attachments: SQOOP-1968.2.patch, SQOOP-1968.patch
>
>
> Two performance issues found in the Matcher implementations.
> 1. In getMatchingData of NameMatcher, the following code block of building a
> HashMap will not change across different getMatchingData calls. The HashMap
> can build only once in Constructor.
> {code}
> HashMap<String,Column> colNames = new HashMap<String, Column>();
> for (Column fromCol: getFromSchema().getColumnsArray()) {
> colNames.put(fromCol.getName(), fromCol);
> }
> {code}
> 2. In getMatchingData of NameMatcher, indexOf of a List implementation is
> not efficient. It usually involves a loop for finding the object and return
> the index. To improve, we can simple store the index in the above HashMap and
> retrieve the index by HashMap lookup directly
> {code}
> int fromIndex = getFromSchema().getColumnsList().indexOf(fromCol);
> {code}
> These performance problems are critical because getMatchingData is repeatedly
> calling for each record.
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