Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/2249#discussion_r71311352
--- Diff: docs/setup/config.md ---
@@ -272,7 +272,9 @@ For example when running Flink on YARN on an
environment with a restrictive fire
- `recovery.zookeeper.quorum`: Defines the ZooKeeper quorum URL which is
used to connet to the ZooKeeper cluster when the 'zookeeper' recovery mode is
selected
-- `recovery.zookeeper.path.root`: (Default '/flink') Defines the root dir
under which the ZooKeeper recovery mode will create znodes.
+- `recovery.zookeeper.path.root`: (Default '/flink') Defines the root dir
under which the ZooKeeper recovery mode will create namespace directories.
+
+- `recovery.zookeeper.path.namespace`: (Default '/default_ns' in
standalone mode, or the <yarn-application-id> under Yarn) Defines the
subdirectory under the root dir where the ZooKeeper recovery mode will create
znodes. This allows to isolate multiple applications on the same ZooKeeper.
--- End diff --
You're right, it would just be a heuristic for generating a unique
namespace but it is not unique because multiple Flink instances might be
running on the same host names (e.g. multiple processes, Docker containers). So
+1 for not adding something that can cause hard to debug problems. We have
covered the Yarn use case which makes it very convenient to setup a namespace.
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