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From Íñigo Goiri (JIRA) <j...@apache.org>
Subject [jira] [Updated] (HDFS-13428) RBF: Remove LinkedList From StateStoreFileImpl.java
Date Wed, 11 Apr 2018 16:57:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-13428?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Íñigo Goiri updated HDFS-13428:
-------------------------------
    Environment:     (was: Replace {{LinkedList}} with {{ArrayList}} implementation in the
StateStoreFileImpl class.  This is especially advantageous because we can pre-allocate the
internal array before a copy occurs.  {{ArrayList}} is faster for iterations and requires
less memory than {{LinkedList}}.

 
{code:java}
  protected List<String> getChildren(String path) {
    List<String> ret = new LinkedList<>();
    File dir = new File(path);
    File[] files = dir.listFiles();
    if (files != null) {
      for (File file : files) {
        String filename = file.getName();
        ret.add(filename);
      }
    }
    return ret;
  }{code})

> RBF: Remove LinkedList From StateStoreFileImpl.java
> ---------------------------------------------------
>
>                 Key: HDFS-13428
>                 URL: https://issues.apache.org/jira/browse/HDFS-13428
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: federation
>    Affects Versions: 3.0.1
>            Reporter: BELUGA BEHR
>            Assignee: BELUGA BEHR
>            Priority: Trivial
>         Attachments: HDFS-13428.1.patch
>
>




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