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https://issues.apache.org/jira/browse/HDFS-11361?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chen Liang updated HDFS-11361:
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    Attachment: HDFS-11361-HDFS-7240.008.patch

Address the compile error in v008 patch.

> Block Storage : add cache interface
> -----------------------------------
>
>                 Key: HDFS-11361
>                 URL: https://issues.apache.org/jira/browse/HDFS-11361
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>         Attachments: HDFS-11361-HDFS-7240.001.patch, 
> HDFS-11361-HDFS-7240.002.patch, HDFS-11361-HDFS-7240.003.patch, 
> HDFS-11361-HDFS-7240.004.patch, HDFS-11361-HDFS-7240.005.patch, 
> HDFS-11361-HDFS-7240.006.patch, HDFS-11361-HDFS-7240.007.patch, 
> HDFS-11361-HDFS-7240.008.patch
>
>
> This JIRA includes two major pieces: 1. the interface exposed to upper layer 
> operating system that mounts the file system; and 2. the interface exposed to 
> lower layer container storage layer.
> On one hand, to make CBlock mountable and accessible for a POSIX OS, we need 
> to implement file system protocol. We chose to do this by running cblock with 
> jSCSI (http://jscsi.org/) which is a java implementation of iSCSI protocol. 
> More specifically, CBlock volume will exposed as an java-based iSCSI target, 
> and any machine that has iSCSI installed will be able to talk to CBlock 
> volume and mounted locally just as any disks. This is JIRA make a starting 
> point by introducing jSCSI and implementing its {{IStorageModule}}. This will 
> be registered to jSCSI server in future JIRA. 
> One the other hand, to be able to have the CBlock talk to container layer 
> with better performance, CBlock should be able to cache data locally. More 
> specifically, clients' read/write should be performed on the locally disk 
> cache, while threads are pushing and retrieving data in backend. This JIRA 
> takes the first step by defining interfaces for the local cache. 



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