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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15338) Add a option to disable the data block cache for testing the performance of underlying file system
Date Fri, 26 Feb 2016 06:19:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15168521#comment-15168521
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Anoop Sam John commented on HBASE-15338:
----------------------------------------

No he can not make cache size as 0. Because then even the index blocks also can not get cached.
 The need is avoid caching of DATA blocks only.   But my thinking was when we specify cache
blocks as false in Get/Scan, we will consider that for DATA blocks only. The index blocks
will get cached any way.  Did not see the code now..  Can check

> Add a option to disable the data block cache for testing the performance of underlying
file system
> --------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-15338
>                 URL: https://issues.apache.org/jira/browse/HBASE-15338
>             Project: HBase
>          Issue Type: Improvement
>          Components: integration tests
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15338-trunk-v1.diff
>
>
> When testing and comparing the performance of different file systems(HDFS, Azure blob
storage, AWS S3 and so on) for HBase, it's better to avoid the affect of the HBase BlockCache
and get the actually random read latency when data block is read from underlying file system.
(Usually, the index block and meta block should be cached in memory in the testing).
> So we add a option in CacheConfig to disable the data block cache.
> Suggestions are welcomed~ Thanks



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