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Date: Fri, 4 Mar 2016 05:26:40 +0000 (UTC)
From: "Anoop Sam John (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-15338) Add a option to disable the data
 block cache for testing the performance of underlying file system
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    [ https://issues.apache.org/jira/browse/HBASE-15338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179354#comment-15179354 ] 

Anoop Sam John commented on HBASE-15338:
----------------------------------------

Actually we dont write any blocks as META block as such.  The block category META is used for FFT and FileInfo also.. But those are read and set as state in HFile's reader instance.  So no Q of caching comes..  Said that, no way we will ask to BC whether to cache a META category block.  So its fine.. +1 for not changing that line. In latest patch u have that. U will revert it?
BTW is this committed? Am not able to see in commit log !!

> 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, HBASE-15338-trunk-v2.diff, HBASE-15338-trunk-v3.diff, HBASE-15338-trunk-v4.diff, HBASE-15338-trunk-v5.diff, HBASE-15338-trunk-v6.diff, HBASE-15338-trunk-v7.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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