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https://issues.apache.org/jira/browse/METRON-2195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16895216#comment-16895216
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Dale Richardson edited comment on METRON-2195 at 7/29/19 12:46 PM:
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[~otto] you are technique correct. Java does not natively support lazy
evaluation. You can fudge the line a little bit and update the API to accept
a lambda function, which wraps your expensive operation. The lambda gets
executed only if the logging level says it's required. Otherwise the cost of
evaluation the lambda body is not incurred.
was (Author: tigerquoll):
[~otto] you are technique correct. Java does not natively support lazy
evaluation. You can fudge the line a little bit and update the API to accept
a lambda function, which wraps your expensive operation. The lambda gets
executed only if the logging level says it's required. Otherwise the cost of
evaluation the lambda body is not incurred.
> Add defensive log level checks when constructing logs is expensive
> ------------------------------------------------------------------
>
> Key: METRON-2195
> URL: https://issues.apache.org/jira/browse/METRON-2195
> Project: Metron
> Issue Type: Improvement
> Reporter: Otto Fowler
> Priority: Critical
> Time Spent: 10m
> Remaining Estimate: 0h
>
> There are instances where we log, and output strings for json objects and
> other things that are quite expensive.
> These are done regardless of the log level being enabled and can increase
> performance significantly:
> https://gist.github.com/mmiklavc/7fd6af13bfa0ca05d9b3f4e7806c8d77
> https://github.com/apache/metron/blob/master/metron-platform/metron-writer/metron-writer-storm/src/main/java/org/apache/metron/writer/hdfs/HdfsWriter.java#L127
> We need to find places where this happens, and employ the best practice check
> for the log level being enabled ( best practice if your parameters or log
> message construction takes a lot of time ).
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