Íñigo Goiri commented on HDFS-13168:

Keeping it as is for consistency makes sense.
Given we are not changing those {{toString()}}, not sure if there are many 
advantages of using char instead of String (for example '<' ).
I would avoid making those changes just to keep the patch constraint (assuming 
my char vs single char String is correct).

> XmlImageVisitor - Prefer Array over LinkedList
> ----------------------------------------------
>                 Key: HDFS-13168
>                 URL: https://issues.apache.org/jira/browse/HDFS-13168
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>    Affects Versions: 3.0.0
>            Reporter: BELUGA BEHR
>            Assignee: BELUGA BEHR
>            Priority: Minor
>         Attachments: HDFS-13168.1.patch, HDFS-13168.2.patch
> {{ArrayDeque}}
> {quote}This class is likely to be faster than Stack when used as a stack, and 
> faster than LinkedList when used as a queue.{quote}
> .. not to mention less memory fragmentation (single backing array v.s. many 
> ArrayList nodes).
> https://docs.oracle.com/javase/8/docs/api/java/util/ArrayDeque.html

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