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Posted to notifications@accumulo.apache.org by "Keith Turner (JIRA)" <ji...@apache.org> on 2019/04/23 15:44:00 UTC
[jira] [Resolved] (ACCUMULO-2837) Scanning empty table can be
optimized
[ https://issues.apache.org/jira/browse/ACCUMULO-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Keith Turner resolved ACCUMULO-2837.
------------------------------------
Resolution: Fixed
> Scanning empty table can be optimized
> -------------------------------------
>
> Key: ACCUMULO-2837
> URL: https://issues.apache.org/jira/browse/ACCUMULO-2837
> Project: Accumulo
> Issue Type: Improvement
> Affects Versions: 1.6.0
> Reporter: Keith Turner
> Assignee: Keith Turner
> Priority: Major
> Labels: performance
> Fix For: 2.0.0
>
>
> I wrote an application that repeatedly scanned random rows in an empty table at one point. It did not know the table was empty. I was jstacking the tserver and repeatedly saw stack traces in a few places in the code.
> * the audit canScan method
> * DefaultConfiguration.get
> * Kept seeing Password token ungziping the password??????
> After fixing all of these issues (except for system token) I ran a simple test I saw times go from ~1.7s to ~1.3s for a simple test I wrote to recreate this issue.
> I am not sure how much of an impact the gziping the password has. I was just sampling the stack traces manually. I seems like I saw the password token gzip stack traces less frequently, but I did catch it multiple jstack calls.
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