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From "Ashish Singhi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-13686) Fail to limit rate in RateLimiter
Date Sun, 07 Jun 2015 16:30:01 GMT

     [ https://issues.apache.org/jira/browse/HBASE-13686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashish Singhi updated HBASE-13686:
----------------------------------
    Attachment: HBASE-13686-branch-1.patch

Attached patch for branch-1.
Found that HBASE-13411 was not there in branch-1 and branch-1.1.
Thanks Ram.

> Fail to limit rate in RateLimiter
> ---------------------------------
>
>                 Key: HBASE-13686
>                 URL: https://issues.apache.org/jira/browse/HBASE-13686
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0, 1.1.0
>            Reporter: Guanghao Zhang
>            Assignee: Ashish Singhi
>              Labels: multitenancy, quota
>             Fix For: 2.0.0, 1.2.0, 1.1.1
>
>         Attachments: HBASE-13686-branch-1.patch, HBASE-13686-v1.patch, HBASE-13686-v2.patch,
HBASE-13686.patch
>
>
> While using the patch in HBASE-11598 , I found that RateLimiter can't to limit the rate
right.
> {code} 
>  /**
>    * given the time interval, are there enough available resources to allow execution?
>    * @param now the current timestamp
>    * @param lastTs the timestamp of the last update
>    * @param amount the number of required resources
>    * @return true if there are enough available resources, otherwise false
>    */
>   public synchronized boolean canExecute(final long now, final long lastTs, final long
amount) {
>     return avail >= amount ? true : refill(now, lastTs) >= amount;
>   }
> {code}
> When avail >= amount, avail can't be refill. But in the next time to call canExecute,
lastTs maybe update. So avail will waste some time to refill. Even we use smaller rate than
the limit, the canExecute will return false. 



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