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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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Description:
This JIRA adds 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 mounted and accessible for OS, we need to implement
some protocol. We chose to do this by running cblock as a iSCSI
(http://jscsi.org/) which is a java implementation of iSCSI protocol. More
specifically, CBlock volume will exposed as an iSCSI target. This is JIRA make
a starting point by introducing jSCSI and implementing its {{IStorageModule}}.
One the other hand, to be able to 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. This allows us to
implement caches with a baseline and makes the unit tests a lot easier.
was:
To be able to get better performance, it would greatly helpful if cblock is
able to cache data locally. More specifically, ideally, 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. This
allows us to implement caches with a baseline and makes the unit tests a lot
easier.
> 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
>
> This JIRA adds 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 mounted and accessible for OS, we need to
> implement some protocol. We chose to do this by running cblock as a iSCSI
> (http://jscsi.org/) which is a java implementation of iSCSI protocol. More
> specifically, CBlock volume will exposed as an iSCSI target. This is JIRA
> make a starting point by introducing jSCSI and implementing its
> {{IStorageModule}}.
> One the other hand, to be able to 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. This allows
> us to implement caches with a baseline and makes the unit tests a lot easier.
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