[jira] [Updated] (HBASE-12219) Cache more efficiently getAll() and get() in FSTableDescriptors

["Esteban Gutierrez (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-12219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Esteban Gutierrez updated HBASE-12219:
--------------------------------------
    Summary: Cache more efficiently getAll() and get() in FSTableDescriptors  (was: Use optionally a TTL based cache for FSTableDescriptors#getAll() and FSTableDescriptors#TableDescriptorAndModtime())

> Cache more efficiently getAll() and get() in FSTableDescriptors
> ---------------------------------------------------------------
>
>                 Key: HBASE-12219
>                 URL: https://issues.apache.org/jira/browse/HBASE-12219
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.94.24, 0.99.1, 0.98.6.1
>            Reporter: Esteban Gutierrez
>            Assignee: Esteban Gutierrez
>              Labels: scalability
>         Attachments: HBASE-12219.v0.txt
>
>
> Currently table descriptors and tables are cached once they are accessed for the first time. Next calls to the master only require a trip to HDFS to lookup the modified time in order to reload the table descriptors if modified. However in clusters with a large number of tables or concurrent clients and this can be too aggressive to HDFS and the master causing contention to process other requests. A simple solution is to have a TTL based cached for FSTableDescriptors#getAll() and  FSTableDescriptors#TableDescriptorAndModtime() that can allow the master to process those calls faster without causing contention without having to perform a trip to HDFS for every call. to listtables() or getTableDescriptor()



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)