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https://issues.apache.org/jira/browse/FLINK-10082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16585602#comment-16585602
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ASF GitHub Bot commented on FLINK-10082:
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zentol opened a new pull request #6580: [FLINK-10082][metrics][slf4j] Provide
initial size to StringBuilder
URL: https://github.com/apache/flink/pull/6580
## What is the purpose of the change
Small modification to the `Slf4jReporter` to initialize the used
`StringBuilder` with the size of the previous report, to prevent frequent
resizing of the backing array.
## Verifying this change
This change is a trivial rework / code cleanup without any test coverage.
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> Initialize StringBuilder in Slf4jReporter with estimated size
> -------------------------------------------------------------
>
> Key: FLINK-10082
> URL: https://issues.apache.org/jira/browse/FLINK-10082
> Project: Flink
> Issue Type: Improvement
> Components: Metrics
> Affects Versions: 1.5.2, 1.6.0
> Reporter: Chesnay Schepler
> Assignee: Chesnay Schepler
> Priority: Major
> Labels: pull-request-available
>
> The {{Slf4jReporter}} uses a StringBuilder to generate the report that is
> later logged. Currently we don't pass the initial size, which for large
> deployments can result in frequent resizing of the backing array.
> We could either estimate the expected size based on the # of metrics, or
> store the size of the last report (given that the total metrics space is
> fairly constant).
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