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Posted to hdfs-dev@hadoop.apache.org by "Ewan Higgs (JIRA)" <ji...@apache.org> on 2017/10/16 14:22:00 UTC
[jira] [Created] (HDFS-12665) [AliasMap] Create a version of the
AliasMap that runs in memory in the Namenode (leveldb)
Ewan Higgs created HDFS-12665:
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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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