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From "Dima Spivak (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12219) Cache more efficiently getAll() and get() in FSTableDescriptors
Date Sun, 02 Nov 2014 04:56:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14193693#comment-14193693
] 

Dima Spivak commented on HBASE-12219:
-------------------------------------

Using [~manukranthk]'s awesome findHangingTests script, it looks like the set of runs that
were red all had org.apache.hadoop.hbase.client.TestAdmin hang, which caused the Surefire-forked
process to time out after 15 minutes and fail the Maven build.

> 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
>             Fix For: 2.0.0, 0.98.8, 0.99.2
>
>         Attachments: HBASE-12219-0.98.patch, HBASE-12219-0.98.v1.patch, HBASE-12219-0.99.addendum.patch,
HBASE-12219-0.99.patch, HBASE-12219-v1.patch, HBASE-12219-v1.patch, HBASE-12219.v0.txt, HBASE-12219.v2.patch,
HBASE-12219.v3.patch, 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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