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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12219) Cache more efficiently getAll() and get() in FSTableDescriptors
Date Fri, 31 Oct 2014 05:26:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14191383#comment-14191383
] 

Hudson commented on HBASE-12219:
--------------------------------

FAILURE: Integrated in HBase-TRUNK #5728 (See [https://builds.apache.org/job/HBase-TRUNK/5728/])
HBASE-12219 Cache more efficiently getAll() and get() in FSTableDescriptors (stack: rev ba7344f5d166e8f3df18258be13240993af1c8d4)
* hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestFSTableDescriptors.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/master/handler/CreateTableHandler.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/util/FSTableDescriptors.java
* hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestCatalogJanitor.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/TableDescriptors.java


> 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-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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