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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-1024) Rearchitect regionserver I/O
Date Wed, 16 Dec 2009 00:13:18 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell resolved HBASE-1024.
-----------------------------------

       Resolution: Fixed
    Fix Version/s: 0.20.0

0.20.0 did enough of this.

> Rearchitect regionserver I/O
> ----------------------------
>
>                 Key: HBASE-1024
>                 URL: https://issues.apache.org/jira/browse/HBASE-1024
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: io, regionserver
>            Reporter: Andrew Purtell
>             Fix For: 0.20.0
>
>
> Consider supporting:
> * 2GB store files
> * 1TB per node (500 store files)
> * Cell values up to ~100MB
> * Typical use case of RS running with 1GB of heap only
> Some ideas:
> * Drop MapFile and make a custom store file format with (competing) design goals:
>       ** heap efficiency 
>       ** fast lookups
>       ** minimize I/O operations
>       ** optimize for typical DFS blocksizes (8MB, 64MB)
> * MRU cache for filehandles and store file indexes
> * Memory mapped store file indexes -- don't hold the indexes in heap; rely on the OS
blockcache for performance
> * "Zero copy" I/O from IPC to store file and vice versa, like NIO buffers
>  

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