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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HBASE-12219) Cache more efficiently getAll() and get() in FSTableDescriptors
Date Wed, 29 Oct 2014 09:57:36 GMT

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

Matteo Bertozzi reassigned HBASE-12219:
---------------------------------------

    Assignee: Esteban Gutierrez  (was: Matteo Bertozzi)

> 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-v1.patch, HBASE-12219.v0.txt, list.png
>
>
> 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()



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