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https://issues.apache.org/jira/browse/HBASE-15338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15168549#comment-15168549
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Anoop Sam John commented on HBASE-15338:
----------------------------------------
Ya after checking code that you mentioned we do
cacheBlock && cacheConf.shouldCacheBlockOnRead(category)
So if Scan says cache block as false, we will not cache any thing.
But one way is there . We won't set any thing wrt cache block in Scan/Get.
When table is created make the CF with data block caching as false
(setBlockCacheEnabled).
{code}
public boolean shouldCacheBlockOnRead(BlockCategory category) {
return isBlockCacheEnabled()
&& (cacheDataOnRead ||
category == BlockCategory.INDEX ||
category == BlockCategory.BLOOM ||
(prefetchOnOpen &&
(category != BlockCategory.META &&
category != BlockCategory.UNKNOWN)));
}
{code}
cacheDataOnRead contains value of HCD setting.
Can you test this..
Around this caching we have several settings already. Adding one more make
thing more complex.. That is why I was checking whether we can avoid this
addition and still achieve what u want. Thanks for the correcting me..
> 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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