[jira] [Created] (HBASE-15695) Ambari support for bucket caching parameter - hbase.bucketcache.ioengine

["Nitin Verma (JIRA)" <ji...@apache.org>]

Nitin Verma created HBASE-15695:
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             Summary: Ambari support for bucket caching parameter - hbase.bucketcache.ioengine
                 Key: HBASE-15695
                 URL: https://issues.apache.org/jira/browse/HBASE-15695
             Project: HBase
          Issue Type: New Feature
          Components: BucketCache
            Reporter: Nitin Verma
            Assignee: Nitin Verma


In order to utilize SSD as a L2 (bucket) cache, we specify a file location to hbase.bucketcache.ioengine parameter. 

hbase.bucketcache.ioengine=file:<filepath>

The directory location specified to the above parameter could be non-existent or non-accessible. 

Since ambari-agent runs with root permissions, the proposed change here is to read the 'hbase.bucketcache.ioengine' parameter from hbase configuration and see if it points to a file location (by looking at file: prefix). 
In case ioengine points to a file, ambari-agent should create the underlying directory and assign appropriate permissions to hbase:hadoop user. 




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