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From "Virajith Jalaparti (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12665) [AliasMap] Create a version of the AliasMap that runs in memory in the Namenode (leveldb)
Date Mon, 27 Nov 2017 21:45:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12665?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Virajith Jalaparti updated HDFS-12665:
--------------------------------------
    Status: Open  (was: Patch Available)

> [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
>         Attachments: HDFS-12665-HDFS-9806.001.patch, HDFS-12665-HDFS-9806.002.patch,
HDFS-12665-HDFS-9806.003.patch, HDFS-12665-HDFS-9806.004.patch, HDFS-12665-HDFS-9806.005.patch,
HDFS-12665-HDFS-9806.006.patch, HDFS-12665-HDFS-9806.007.patch, HDFS-12665-HDFS-9806.008.patch,
HDFS-12665-HDFS-9806.009.patch, HDFS-12665-HDFS-9806.010.patch
>
>
> 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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