hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12219) Cache more efficiently getAll() and get() in FSTableDescriptors
Date Tue, 04 Nov 2014 23:25:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14197109#comment-14197109
] 

Andrew Purtell commented on HBASE-12219:
----------------------------------------

I applied the addendum patch to 0.98. A quick test with the minicluster and shell truncate
command looks ok. TestAdmin truncate tests pass. Please apply the addendum to 0.98 whenever
ready [~stack]

> 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.addendum.patch, HBASE-12219-0.98.v1.patch,
HBASE-12219-0.99.addendum.patch, HBASE-12219-0.99.patch, HBASE-12219-0.99.v1.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()



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

Mime
View raw message