Need a public way to check DFS Safemode status
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Key: HDFS-2466
URL: https://issues.apache.org/jira/browse/HDFS-2466
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs client
Affects Versions: 0.23.0
Reporter: Harsh J
Assignee: Harsh J
Priority: Critical
The current way for a DFS client to check or set safemode status is via the
private DistributedFileSystem instances.
While user/downstream (HBASE, PIG, HIVE) clients do not really need a way to
"set" the safemode (doable by shell functions today), they can surely benefit
from having a public API to check for safemode. Right now there is no way to do
so.
I plan to introduce a safemode check via a new public, evolving API "HDFSAdmin"
(DFSAdmin already seems taken up by shell).
(Part of HBASE-4510 can benefit from this, for example)
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