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https://issues.apache.org/jira/browse/HDFS-12912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16286349#comment-16286349
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Virajith Jalaparti commented on HDFS-12912:
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Hi [~daryn], Leveldb is used only as part of a custom implementation (which is
configurable) of the mapping we store from hdfs blocks to (segments of) files
in the remote storage system. Others could be used for maintaining this
mapping. It is not part of the common code path.
> [READ] Fix configuration and implementation of LevelDB-based alias maps
> -----------------------------------------------------------------------
>
> Key: HDFS-12912
> URL: https://issues.apache.org/jira/browse/HDFS-12912
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Virajith Jalaparti
> Attachments: HDFS-12912-HDFS-9806.001.patch
>
>
> {{LevelDBFileRegionAliasMap}} fails to create the leveldb store if the
> directory is absent.
> {{InMemoryAliasMap}} does not support reading from leveldb-based alias map
> created from {{LevelDBFileRegionAliasMap}} with the block id configured.
> Further, the configuration for these aliasmaps must be specified using local
> paths and not as URIs as currently shown in the documentation
> ({{HdfsProvidedStorage.md}}).
> This JIRA is to fix these issues.
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