DataNode will create missing dfs.data.dir directories contrary to docs
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Key: HADOOP-4799
URL: https://issues.apache.org/jira/browse/HADOOP-4799
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Affects Versions: 0.19.0
Reporter: Todd Lipcon
Priority: Minor
The documentation (and HADOOP-340) seems to indicate that if a data dir listed
in dfs.data.dir does not exist, it will be ignored. In fact, if the hadoop user
has access to (essentially) mkdir -p the data dir it will do so.
I'd like to add another configuration parameter, perhaps dfs.data.dir.create
with default true (to not break any existing tutorials). If this is set to
false then data dirs that do not exist will not implicitly be created.
The motivation for this is the same as HADOOP-340 - we have different disk
configs in our cluster and hadoop is creating data dirs where we do not want
them.
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