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https://issues.apache.org/jira/browse/CASSANDRA-4697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13460584#comment-13460584
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Jonathan Ellis commented on CASSANDRA-4697:
-------------------------------------------

If we switch to explicitly calling a method, we need to add a "if 
logger.isDebugEnabled" wrapper, otherwise the method call gets evaluated 
unnecessarily.

But why is ArrayList.toString not being invoked?
                
> incorrect debug message in LeveledManifest.java
> -----------------------------------------------
>
>                 Key: CASSANDRA-4697
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4697
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.0.11, 1.1.5
>            Reporter: Radim Kolar
>            Priority: Trivial
>
> https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/compaction/LeveledManifest.java
>  line 622.
> logger.debug("Estimating {} compactions to do for {}.{}",
> new Object[] {Arrays.asList(estimated), cfs.table.name, cfs.columnFamily});
> It does not print list as intended. Arrays.asList(estimated).toString() 
> results in object reference number, not list itself making debug message 
> useless.
> list should be printed by code like this:
>    String delim = "";
>     for (Item i : list) {
>         sb.append(delim).append(i);
>         delim = ",";
>     }

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