[jira] Commented: (CASSANDRA-611) Fix Findbugs: Replace keySet w entrySet

["Stu Hood (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12788212#action_12788212 ] 

Stu Hood commented on CASSANDRA-611:
------------------------------------

I just noticed that this report missed the most critical of all our abuses of keySet(): calling ColumnFamily.getSortedValues(), and then calling getColumn(name) on another CF. For two sorted lists, we should iterate in parallel.

> Fix Findbugs: Replace keySet w entrySet
> ---------------------------------------
>
>                 Key: CASSANDRA-611
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-611
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Stu Hood
>         Attachments: findbugs-keyset-w-entryset.txt
>
>
> A lot of places in the codebase, we iterate over the  keySet() of a Map, and call get() for each key. For a HashMap, this is still O(N), but when you are dealing with a SortedMap, this is O(NlogN). The list of occurences are attached.
> Fixing this issue should give us a general (minor?) performance boost.
> In order to find unused method parameters for CASSANDRA-608, I ran FindBugs against Cassandra, and found a few interesting issues we ought to explore (but not the unused method params, oi.)

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