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https://issues.apache.org/jira/browse/HDFS-13957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16638551#comment-16638551
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Virajith Jalaparti edited comment on HDFS-13957 at 10/4/18 5:06 PM:
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Hi [~linyiqun], thanks for bring this up! the "-o" is a typo in the first
sentence you mentioned. "-b" should be used to specify the blockaliasmap
({{LevelDBFileRegionAliasMap}} in this case.
Do you plan to post a patch for this? if not, I can do it later in the day
was (Author: virajith):
Hi [~linyiqun], thanks for bring this up! the "-o" is a typo in the first
sentence you mentioned. "-b" should be used to specify the blockaliasmap
(\{{LevelDBFileRegionAliasMap}} in this case.
> Fix incorrect option used in description of InMemoryAliasMap
> -------------------------------------------------------------
>
> Key: HDFS-13957
> URL: https://issues.apache.org/jira/browse/HDFS-13957
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: documentation
> Affects Versions: 3.1.1
> Reporter: Yiqun Lin
> Priority: Minor
>
> The incorrect option was used in description of InMemoryAliasMap.
> {noformat}
> This is a LevelDB-based alias map that runs as a separate server in Namenode.
> The alias map itself can be created using the fs2img tool using the option
> -Ddfs.provided.aliasmap.leveldb.path=file:///path/to/leveldb/map/dingos.db -o
> org.apache.hadoop.hdfs.server.common.blockaliasmap.impl.LevelDBFileRegionAliasMap
> as in the example above.
> {noformat}
> Here -o should be -b, -o is specified for output directory of generated
> fsimage. -b is for block output class. The right usage showed in the doc:
> {noformat}
> hadoop org.apache.hadoop.hdfs.server.namenode.FileSystemImage \
> -Ddfs.provided.aliasmap.leveldb.path=/path/to/leveldb/map/dingos.db \
> -b
> org.apache.hadoop.hdfs.server.common.blockaliasmap.impl.LevelDBFileRegionAliasMap
> \
> -o file:///tmp/name \
> -u CustomResolver \
> hdfs://enfield/projects/ywqmd/incandenza
> {noformat}
>
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