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https://issues.apache.org/jira/browse/HBASE-3856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mikhail Bautin resolved HBASE-3856.
-----------------------------------
Resolution: Fixed
Fix Version/s: 0.94.0
0.92.0
Resolved as HBASE-3857 got committed.
> Build a tree structure data block index inside of the HFile
> -----------------------------------------------------------
>
> Key: HBASE-3856
> URL: https://issues.apache.org/jira/browse/HBASE-3856
> Project: HBase
> Issue Type: New Feature
> Reporter: Liyin Tang
> Assignee: Liyin Tang
> Fix For: 0.92.0, 0.94.0
>
>
> The motivation is the data block index is too large to hold into memory. In
> our cases, each region server hold almost 6G block index in the memory. So we
> propose to build a tree structure data block index and only hold the root
> level in the memory. All the intermediate level will be cached in an LRU
> cache. In the leaf level, we will write the block index inline inside of the
> data section. In this way, there is no need to hold all the block index in
> the memory.
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