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Posted to dev@accumulo.apache.org by "Eric Newton (Created) (JIRA)" <ji...@apache.org> on 2012/04/17 23:27:13 UTC

[jira] [Created] (ACCUMULO-542) with a large root tablet, tablet servers will get stuck loading other metadata tablets

with a large root tablet, tablet servers will get stuck loading other metadata tablets
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                 Key: ACCUMULO-542
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-542
             Project: Accumulo
          Issue Type: Bug
          Components: tserver
    Affects Versions: 1.4.0, 1.3.5
         Environment: large cluster with 390+ metadata data tablets
            Reporter: Eric Newton
            Assignee: Eric Newton
            Priority: Critical
             Fix For: 1.3.6


Trying to bring up a large cluster, metadata tablets failed to load. These metadata tablets were trying to read their entries from the root tablet.

Workaround is to double the memory used for scanning the !METADATA table:

{noformat}
shell> config -t !METADATA -s table.scan.max.memory=2M
{noformat}

Nothing needs to be done: the tablet servers will recover as soon as this value is changed.


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[jira] [Commented] (ACCUMULO-542) with a large root tablet, tablet servers will get stuck loading other metadata tablets

Posted by "Keith Turner (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/ACCUMULO-542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13255969#comment-13255969 ] 

Keith Turner commented on ACCUMULO-542:
---------------------------------------

For 1.5 we may want to consider switching the old code the reads directly from the root tablet to user a scanner.  Also we noticed the code was reading everything in the root tablet after the tablet of interest.  This is completely unnecessary.  
                
> with a large root tablet, tablet servers will get stuck loading other metadata tablets
> --------------------------------------------------------------------------------------
>
>                 Key: ACCUMULO-542
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-542
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.4.0, 1.3.5
>         Environment: large cluster with 390+ metadata data tablets
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>            Priority: Critical
>             Fix For: 1.3.6
>
>
> Trying to bring up a large cluster, metadata tablets failed to load. These metadata tablets were trying to read their entries from the root tablet.
> Workaround is to double the memory used for scanning the !METADATA table:
> {noformat}
> shell> config -t !METADATA -s table.scan.max.memory=2M
> {noformat}
> Nothing needs to be done: the tablet servers will recover as soon as this value is changed.

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[jira] [Resolved] (ACCUMULO-542) with a large root tablet, tablet servers will get stuck loading other metadata tablets

Posted by "Eric Newton (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/ACCUMULO-542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Newton resolved ACCUMULO-542.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 1.4.1
    
> with a large root tablet, tablet servers will get stuck loading other metadata tablets
> --------------------------------------------------------------------------------------
>
>                 Key: ACCUMULO-542
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-542
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.4.0, 1.3.5
>         Environment: large cluster with 390+ metadata data tablets
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>            Priority: Critical
>             Fix For: 1.4.1, 1.3.6
>
>
> Trying to bring up a large cluster, metadata tablets failed to load. These metadata tablets were trying to read their entries from the root tablet.
> Workaround is to double the memory used for scanning the !METADATA table:
> {noformat}
> shell> config -t !METADATA -s table.scan.max.memory=2M
> {noformat}
> Nothing needs to be done: the tablet servers will recover as soon as this value is changed.

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