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https://issues.apache.org/jira/browse/HBASE-15314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15850958#comment-15850958
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chunhui shen commented on HBASE-15314:
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Sorry, I still haven't got the benefit point if blocks are guaranteed to
reside in a single segment.
With either of the two approaches, I think the BucketCache can still continue
operating if device failure.
In fact, the attachment 'FileIOEngine.java ' also includes the logic of
tolerating device failure.
bq.This does not happen in the patch I submitted, but it could be an
improvement that you wouldn't be able to easily handle if HBase blocks crossed
segments.
Thus, I don't t agree that it wouldn't be able to easily handle if HBase blocks
crossed segments.
At last, I still think the BucketCache shouldn't be aware of multi-segments,
the FileIOEngine should provide a contiguous storage with several physical
devices, just like RAID.
> Allow more than one backing file in bucketcache
> -----------------------------------------------
>
> Key: HBASE-15314
> URL: https://issues.apache.org/jira/browse/HBASE-15314
> Project: HBase
> Issue Type: Sub-task
> Components: BucketCache
> Reporter: stack
> Assignee: Aaron Tokhy
> Attachments: FileIOEngine.java, HBASE-15314.master.001.patch,
> HBASE-15314.master.001.patch, HBASE-15314.patch, HBASE-15314-v2.patch,
> HBASE-15314-v3.patch
>
>
> Allow bucketcache use more than just one backing file: e.g. chassis has more
> than one SSD in it.
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