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https://issues.apache.org/jira/browse/HDFS-11832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16017669#comment-16017669
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Akira Ajisaka commented on HDFS-11832:
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Thanks [~10075197], I think this is not right. In the following code,
{{Arrays.asList(blocks)}} is called to evaluate the variable before calling
{{LOG.debug()}}.
{code}
LOG.debug("blocks = {}", java.util.Arrays.asList(blocks));
{code}
bq. However, the second form will outperform the first form by a factor of at
least 30, in case of a disabled logging statement.
The second form skips {{Object.toString()}}, so it is faster. However, the form
cannot skip the method call in the variable.
> Switch leftover logs to slf4j format in BlockManager.java
> ---------------------------------------------------------
>
> Key: HDFS-11832
> URL: https://issues.apache.org/jira/browse/HDFS-11832
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.7.0, 2.8.0, 3.0.0-alpha1
> Reporter: Hui Xu
> Assignee: Chen Liang
> Priority: Minor
> Attachments: HDFS-11832.001.patch, HDFS-11832.002.patch,
> HDFS-11832.003.patch, HDFS-11832.004.patch
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> HDFS-7706 Switch BlockManager logging to use slf4j. But the logging formats
> were not modified appropriately. For example:
> if (LOG.isDebugEnabled()) {
> LOG.debug("blocks = " + java.util.Arrays.asList(blocks));
> }
> These codes should be modified to:
> LOG.debug("blocks = {}", java.util.Arrays.asList(blocks));
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