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From "Ewan Higgs (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12665) [AliasMap] Create a version of the AliasMap that runs in memory in the Namenode (leveldb)
Date Mon, 16 Oct 2017 14:22:00 GMT
Ewan Higgs created HDFS-12665:
---------------------------------

             Summary: [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


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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