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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Commented] (OAK-370) Creating Root is too expensive
Date Wed, 10 Oct 2012 09:31:02 GMT

    [ https://issues.apache.org/jira/browse/OAK-370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13473125#comment-13473125
] 

Michael Dürig commented on OAK-370:
-----------------------------------


This has been fixed with OAK-272. The test below creates 10000000 {{Root}} instances within
1.9 seconds. Only when I uncomment {{root.commit}} it goes up to 18s. So I think it's something
different which is expensive in your case.

{code}
@Test
public void getRootInALoop() throws CommitFailedException {
    long t0 = System.currentTimeMillis();
    for (int k = 0; k < 1000000; k++) {
        RootImpl root = createRootImpl(null);
        root.createRootBuilder().setProperty("foo" + k, "bar");
//      root.commit();
    }
    System.out.println(System.currentTimeMillis() - t0);
}
{code}
                
> Creating Root is too expensive
> ------------------------------
>
>                 Key: OAK-370
>                 URL: https://issues.apache.org/jira/browse/OAK-370
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core
>            Reporter: angela
>
> see http://mail-archives.apache.org/mod_mbox/jackrabbit-oak-dev/201210.mbox/%3C50741032.4050706@adobe.com%3E
> imo creating a new root instance (and thus creating a new session) should
> be for free. even creating a root instance that is just used for reading should be cheap.
all kind of extra effort associated with a potential write operation should be postponed until
write does really happen.

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