Yiqun Lin created HDFS-13957:
--------------------------------
Summary: 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
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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