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Subject [16/50] [abbrv] hadoop git commit: YARN-7502. Nodemanager restart docs should describe nodemanager supervised property. Contributed by Suma Shivaprasad.
Date Sat, 15 Dec 2018 00:04:47 GMT
YARN-7502. Nodemanager restart docs should describe nodemanager supervised property. Contributed
by Suma Shivaprasad.

(cherry picked from commit e50334513c781a10368e7353bec6674f89eb0a7b)

Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/0c39681b
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/0c39681b
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/0c39681b

Branch: refs/heads/branch-2-jhung-test
Commit: 0c39681b2cc24723171c34676760a86ffefeda07
Parents: 03ff0f1
Author: Sunil G <sunilg@apache.org>
Authored: Mon Oct 22 14:15:51 2018 +0530
Committer: Jonathan Hung <jyhung2357@gmail.com>
Committed: Fri Dec 14 16:03:55 2018 -0800

 .../hadoop-yarn-site/src/site/markdown/NodeManager.md     | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/NodeManager.md
index 12201b9..18aeff4 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/NodeManager.md
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/NodeManager.md
@@ -77,13 +77,19 @@ Step 2.  Configure a path to the local file-system directory where the
 |:---- |:---- |
 | `yarn.nodemanager.recovery.dir` | The local filesystem directory in which the node manager
will store state when recovery is enabled. The default value is set to `$hadoop.tmp.dir/yarn-nm-recovery`.
-Step 3.  Configure a valid RPC address for the NodeManager.
+Step 3: Enable NM supervision under recovery to prevent running containers from getting cleaned
up when NM exits.
+| Property | Description |
+|:---- |:---- |
+| `yarn.nodemanager.recovery.supervised` | If enabled, NodeManager running will not try to
cleanup containers as it exits with the assumption it will be immediately be restarted and
recover containers The default value is set to 'false'. |
+Step 4.  Configure a valid RPC address for the NodeManager.
 | Property | Description |
 |:---- |:---- |
 | `yarn.nodemanager.address` | Ephemeral ports (port 0, which is default) cannot be used
for the NodeManager's RPC server specified via yarn.nodemanager.address as it can make NM
use different ports before and after a restart. This will break any previously running clients
that were communicating with the NM before restart. Explicitly setting yarn.nodemanager.address
to an address with specific port number (for e.g is a precondition for enabling
NM restart. |
-Step 4.  Auxiliary services.
+Step 5.  Auxiliary services.
   * NodeManagers in a YARN cluster can be configured to run auxiliary services. For a completely
functional NM restart, YARN relies on any auxiliary service configured to also support recovery.
This usually includes (1) avoiding usage of ephemeral ports so that previously running clients
(in this case, usually containers) are not disrupted after restart and (2) having the auxiliary
service itself support recoverability by reloading any previous state when NodeManager restarts
and reinitializes the auxiliary service.

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