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From "Ewan Higgs (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10759) Change fsimage bool isStriped from boolean to an enum
Date Fri, 02 Sep 2016 09:28:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ewan Higgs updated HDFS-10759:
------------------------------
    Attachment: HDFS-10759.0001.patch

Attached patch which converts isStriped to an enum on the protocol level. This has been rebased
to 0690f0969efef201b074a8b26400b2e5ba9b97ad.

> Change fsimage bool isStriped from boolean to an enum
> -----------------------------------------------------
>
>                 Key: HDFS-10759
>                 URL: https://issues.apache.org/jira/browse/HDFS-10759
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs
>    Affects Versions: 3.0.0-alpha1, 3.0.0-beta1, 3.0.0-alpha2
>            Reporter: Ewan Higgs
>         Attachments: HDFS-10759.0001.patch
>
>
> The new erasure coding project has updated the protocol for fsimage such that the {{INodeFile}}
has a boolean '{{isStriped}}'. I think this is better as an enum or integer since a boolean
precludes any future block types. 
> For example:
> {code}
> enum BlockType {
>   CONTIGUOUS = 0,
>   STRIPED = 1,
> }
> {code}
> We can also make this more robust to future changes where there are different block types
supported in a staged rollout.  Here, we would use {{UNKNOWN_BLOCK_TYPE}} as the first value
since this is the default value. See [here|http://androiddevblog.com/protocol-buffers-pitfall-adding-enum-values/]
for more discussion.
> {code}
> enum BlockType {
>   UNKNOWN_BLOCK_TYPE = 0,
>   CONTIGUOUS = 1,
>   STRIPED = 2,
> }
> {code}
> But I'm not convinced this is necessary since there are other enums that don't use this
approach.



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