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From "Yaohui Wu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2661) It costs about 5055 ms to create Zookeeper object for the first time.
Date Wed, 11 Jan 2017 08:34:58 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15817664#comment-15817664
] 

Yaohui Wu commented on ZOOKEEPER-2661:
--------------------------------------

It seems that the call InetAddress.getLocalHost() at line 62 is slow.

code from class org.apache.zookeeper.Environment at line 56~65:
public static List<Entry> list() {
        ArrayList<Entry> l = new ArrayList<Entry>();
        put(l, "zookeeper.version", Version.getFullVersion());

        try {
            put(l, "host.name",//line 61
                InetAddress.getLocalHost().getCanonicalHostName());//line 62
        } catch (UnknownHostException e) {
            put(l, "host.name", "<NA>");
        }

> It costs about 5055 ms to create Zookeeper object for the first time.
> ---------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2661
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2661
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: java client
>    Affects Versions: 3.4.6
>         Environment: See the description below.
>            Reporter: Yaohui Wu
>         Attachments: ZookeeperTest.java, log_output.txt
>
>
> I create and close ZooKeeper for 10 times.  It costs about 5055 ms for the first time.
> See attached files for some test code and output.



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