[jira] [Reopened] (HDFS-8058) Erasure coding: use BlockInfo[] for both striped and contiguous blocks in INodeFile

["Zhe Zhang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-8058?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhe Zhang reopened HDFS-8058:
-----------------------------

Per discussion under HDFS-7285 and HDFS-8728, we should revisit the use of {{BlockInfoStriped}} and {{BlockInfoContiguous}} before merging into trunk.

> Erasure coding: use BlockInfo[] for both striped and contiguous blocks in INodeFile
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-8058
>                 URL: https://issues.apache.org/jira/browse/HDFS-8058
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: HDFS-7285
>            Reporter: Yi Liu
>            Assignee: Yi Liu
>         Attachments: HDFS-8058.001.patch, HDFS-8058.002.patch
>
>
> This JIRA is to use {{BlockInfo[] blocks}} for both striped and contiguous blocks in INodeFile.
> Currently {{FileWithStripedBlocksFeature}} keeps separate list for striped blocks, and the methods there duplicate with those in INodeFile, and current code need to judge {{isStriped}} then do different things. Also if file is striped, the {{blocks}} in INodeFile occupy a reference memory space.
> These are not necessary, and we can use the same {{blocks}} to make code more clear.
> I keep {{FileWithStripedBlocksFeature}} as empty for follow use: I will file a new JIRA to move {{dataBlockNum}} and {{parityBlockNum}} from *BlockInfoStriped* to INodeFile, since ideally they are the same for all striped blocks in a file, and store them in block will waste NN memory.



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