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https://issues.apache.org/jira/browse/HDFS-12665?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ewan Higgs reassigned HDFS-12665:
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Assignee: Ewan Higgs
> [AliasMap] Create a version of the AliasMap that runs in memory in the
> Namenode (leveldb)
> -----------------------------------------------------------------------------------------
>
> Key: HDFS-12665
> URL: https://issues.apache.org/jira/browse/HDFS-12665
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Ewan Higgs
> Assignee: Ewan Higgs
>
> The design of Provided Storage requires the use of an AliasMap to manage the
> mapping between blocks of files on the local HDFS and ranges of files on a
> remote storage system. To reduce load from the Namenode, this can be done
> using a pluggable external service (e.g. AzureTable, Cassandra, Ratis).
> However, to aide adoption and ease of deployment, we propose an in memory
> version.
> This AliasMap will be a wrapper around LevelDB (already a dependency from the
> Timeline Service) and use protobuf for the key (blockpool, blockid, and
> genstamp) and the value (url, offset, length, nonce). The in memory service
> will also have a configurable port on which it will listen for updates from
> Storage Policy Satisfier (SPS) Coordinating Datanodes (C-DN).
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