mgr/mds_autoscaler: add autoscaling for mds mgmt by mchangir · Pull Request #32731 · ceph/ceph

mchangir · 2020-01-20T09:25:15Z

MDS instance management as per changes to 'max_mds' option and mds process liveness.

Fixes: https://tracker.ceph.com/issues/40929
Signed-off-by: Milind Changire mchangir@redhat.com

Checklist

References tracker ticket
Updates documentation if necessary
Includes tests for new functionality or reproducer for bug

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sebastian-philipp

Please add this module to the ../tox.ini under mypy

src/pybind/mgr/mds_autoscaler/module.py

src/pybind/mgr/mds_autoscaler/__init__.py

src/pybind/mgr/mds_autoscaler/module.py

batrick · 2020-01-21T20:25:42Z

src/pybind/mgr/mds_autoscaler/module.py

+    def is_fewer_than_max_mds(self, fs):
+        if len(fs['in']) < fs['max_mds']:
+            return True
+        return False


It's not that simple. You need to review:

https://github.com/ceph/ceph/blob/master/src/mds/MDSMap.cc#L1025-L1033

and

ceph/src/mon/MDSMonitor.cc

Line 1996 in 0573918

bool MDSMonitor::maybe_promote_standby(FSMap &fsmap, Filesystem& fs)

In general, you only really need to ensure that sufficient standbys exist for a file system. The monitors will use standbys to stabilize the file system if possible. You will see an "INSUFFICIENT_STANDBY" warning generated by the monitors if there are not enough standbys for a file system. See also:

ceph/src/mds/MDSMap.h

Lines 242 to 250 in 0573918

mds_rank_t get_standby_count_wanted(mds_rank_t standby_daemon_count) const {

ceph_assert(standby_daemon_count >= 0);

std::set<mds_rank_t> s;

get_standby_replay_mds_set(s);

mds_rank_t standbys_avail = (mds_rank_t)s.size()+standby_daemon_count;

mds_rank_t wanted = std::max(0, standby_count_wanted);

return wanted > standbys_avail ? wanted - standbys_avail : 0;

}

void set_standby_count_wanted(mds_rank_t n) { standby_count_wanted = n; }

This module should be able to monitor for that via the below notify method for the "clog" events. However, this module should just replicate the logic that detects insufficient standbys and not try to parse the clog event message.

batrick · 2020-01-22T22:20:33Z

src/mgr/Mgr.cc

    case CEPH_MSG_FS_MAP:
-      py_module_registry->notify_all("fs_map", "");
      handle_fs_map(ref_cast<MFSMap>(m));
+      py_module_registry->notify_all("fs_map", "");


This should be in a separate commit with explanation.

(Looks like you figured out the problem with point 1. in the mail you sent.)

I would also send this fix as a separate PR so it can get in sooner.

@batrick I thought I had figured out the problem, but doesn't look like so. The fs_map object is still undefined when the clog notification type is handled by the plugin.
Or maybe I turned too many knobs at once while changing the handling of notifications fromfs_map to clog. The plugin probably needs to handle the fs_map notification to save the fs_map and then act on it when the clog notification is delivered.

@batrick This was the missing scope specifier (self) prefix to the fs_map member that was biting me.

vshankar · 2020-01-24T11:01:46Z

src/pybind/mgr/mds_autoscaler/module.py

+                time.sleep(1)
+
+    def is_insufficient_standby(self, message):
+        return (message == 'Health check failed: insufficient standby MDS daemons available (MDS_INSUFFICIENT_STANDBY)')


is such a comparison the only way to figure out if there are insufficient standbys? wouldn't get_current_standby_count() < get_total_standby_count_required() be a good enough?

@vshankar you're right

vshankar · 2020-01-24T11:09:44Z

src/pybind/mgr/mds_autoscaler/module.py

+            if isinstance(notify_id, dict):
+                message = notify_id.get('message')
+                if self.is_insufficient_standby(message) and self.fs_map:
+                    self.filesystems = self.fs_map['filesystems']


is it really required to maintain a copy of fsmap, filesystems and standbys?

@vshankar did away with the copies now ... will update PR later

vshankar · 2020-01-24T11:19:37Z

src/mgr/Mgr.cc

          {}, &c->outbl, &c->outs, c);
    }
  }
+  fs_map_cond.notify_all();


this has been moved from the start of the routine to the end -- what does it fix?

@vshankar I had thought of moving the notification to the last since my patch wasn't working; but my python code wasn't what it was supposed to be; I'll be reverting back these changes

src/pybind/mgr/mds_autoscaler/module.py

liewegas · 2020-03-09T12:03:43Z

src/pybind/mgr/mds_autoscaler/module.py

+                if sb['state'] == 'up:active' and sb['rank'] == -1:
+                    name = sb['name']
+                    self.remove_mds(sb['name'])
+                    break


I think this logic should be moved to cephadm so that it, in general, kills standby (mds,mgr) daemons when scaling down.

@liewegas I presumed that cephadm was only responsible for implementing the mechanism of the operations and the policy decisions were supposed to be taken by cephadm clients.

cephadm has a kubernetes-like spec (that says, e.g., "3 daemons") and controller that ensures that the right number of daemons are running, removing or adding individual daemons will tend to fight with that: if you remove one, a new one will get created (somewhere), and if you add one, an existing one will get removed. Alternatively, if you adjust the count down, cephadm will pick which one to remove.

I think the best path forward is to make cephadm (and rook) just a bit smarter so that they prefer to remove standby daemons and not active ones. Then this tool just needs to adjust the total daemon count (max_mds + num standbys)...

I have a half-written patch to make cephadm prefer to remove standbys... so I suggest simplifying this PR to just adjust the count.

@liewegas "Then this tool just needs to adjust the total daemon count (max_mds + num standbys)" ... how do I do that ?

In the most common case, it's as simple as ceph orch apply mds $fsname $count (apply_mds(...)). But the user might have a customized placement (specifying a label, hosts, etc.). So I think right thing to do is fetch the current placement (you can do this with ceph orch ls --service-name mds.$fsname (describe_service(service_name='mds.whatever')), modify just the count field in spec.placement PlacementSpec (make a copy first--don't modify in place), and then send that back to apply_mds().

@liewegas all that the describe_service() returns back is one record about the crash service
I've posted a WIP PR; please take a look; I must be missing something that I can't fathom yet.

@sebastian-philipp I'm trying to test my plugin on a vstart cluster on my laptop. I can't find anyway to make cephadm act on the default cephfs.a cluster. Looks like cephadm should start the daemons itself to gain ownership of the cluster to effectively act on them.
Is there a way to instruct cephadm to start a file-system and take ownership of all relevant daemons ?
The MDS Autoscaler Plugin is supposed to act on changes to the FSMap and spawn or kill MDS standby daemons as required. Could you suggest me a workflow to achieve this ? I've used Sage's suggestions to update my code but the describe_service() API isn't listing anything than the crash service. Same goes with ceph orch ls command at the command-line as well.

@mchangir so, cephadm won't touch any daemons that are not created by cephadm, like e.g. daemons created by vstart.sh. you'll have to create them using ceph orch apply mds... and not via vstart.

is there a way to instruct cephadm to start a file-system and take ownership of all relevant daemons ?

yes: ceph fs volume create --placement=....

the describe_service() API isn't listing anything than the crash service

exactly. you'll have to create the daemons using cephadm first.

sebastian-philipp · 2020-03-23T14:22:18Z

mypy run-test: commands[0] | mypy --config-file=../../mypy.ini cephadm/module.py mgr_module.py dashboard/module.py mgr_util.py orchestrator/__init__.py progress/module.py rook/module.py osd_support/module.py test_orchestrator/module.py volumes/__init__.py mds_autoscaler/module.py
mds_autoscaler/module.py: note: In member "create_mds_old" of class "MDSAutoscaler":
mds_autoscaler/module.py:30: error: Module has no attribute "ServiceSpec"
mds_autoscaler/module.py: note: In member "delete_mds_old" of class "MDSAutoscaler":
mds_autoscaler/module.py:45: error: Value of type "Optional[Any]" is not indexable
mds_autoscaler/module.py:49: error: "MDSAutoscaler" has no attribute "remove_mds"
mds_autoscaler/module.py: note: In member "get_required_standby_count" of class "MDSAutoscaler":
mds_autoscaler/module.py:99: error: Value of type "Optional[Any]" is not indexable
mds_autoscaler/module.py: note: In member "get_current_standby_count" of class "MDSAutoscaler":
mds_autoscaler/module.py:106: error: Value of type "Optional[Any]" is not indexable
mds_autoscaler/module.py: note: In member "get_fs_name" of class "MDSAutoscaler":
mds_autoscaler/module.py:109: error: Value of type "Optional[Any]" is not indexable
Found 6 errors in 1 file (checked 11 source files)

batrick

I'm trying this out with vstart.sh: env MDS=5 ../src/vstart.sh -n -d --cephadm.

I'm seeing the module do some work (with the patches below suggested) but cephadm isn't spawning any new daemons. Have you tried this with vstart.sh?

batrick · 2020-08-04T23:37:04Z

src/pybind/mgr/mds_autoscaler/module.py

+        assert fs_map is not None
+        for fsys in fs_map['filesystems']:
+            if fsys.get('mdsmap').get('fs_name') == fs_name:
+                return len(fsys.get('mdsmap').get('up'))


Since you're looking at the daemon names in get_current_standby_count to determine which standbys belong to a file system, you need to do the same here. If the daemon was not spawned by the orchestrator, it should not be counted.

batrick · 2020-08-04T23:38:17Z

src/pybind/mgr/mds_autoscaler/module.py

+        for fsys in fs_map['filesystems']:
+            if fsys.get('mdsmap').get('fs_name') == fs_name:
+                return len(fsys.get('mdsmap').get('up'))


Suggested change

for fsys in fs_map['filesystems']:

if fsys.get('mdsmap').get('fs_name') == fs_name:

return len(fsys.get('mdsmap').get('up'))

for fs in fs_map['filesystems']:

if fs['mdsmap']['fs_name'] == fs_name:

return len(fs['mdsmap']['up'])

batrick · 2020-08-04T23:38:34Z

src/pybind/mgr/mds_autoscaler/module.py

+        assert fs_map is not None
+        for fs in fs_map['filesystems']:
+            if fs['mdsmap']['fs_name'] == fs_name:
+                return fs['mdsmap'].get('standby_count_wanted')


Suggested change

return fs['mdsmap'].get('standby_count_wanted')

return fs['mdsmap']['standby_count_wanted']

batrick · 2020-08-04T23:39:27Z

src/pybind/mgr/mds_autoscaler/module.py

+        for fsys in fs_map['filesystems']:
+            if fsys.get('mdsmap').get('fs_name') == fs_name:
+                return fsys.get('mdsmap', {}).get('max_mds')


Suggested change

for fsys in fs_map['filesystems']:

if fsys.get('mdsmap').get('fs_name') == fs_name:

return fsys.get('mdsmap', {}).get('max_mds')

for fs in fs_map['filesystems']:

if fs['mdsmap']['fs_name'] == fs_name:

return fs['mdsmap']['max_mds']

batrick · 2020-08-04T23:40:36Z

src/pybind/mgr/mds_autoscaler/module.py

+        except (orchestrator.OrchestratorError, AssertionError) as e:
+            self.log.debug(f"fs:{fs_name} exception while verifying mds status: {e!r}")


Suggested change

except (orchestrator.OrchestratorError, AssertionError) as e:

self.log.debug(f"fs:{fs_name} exception while verifying mds status: {e!r}")

except orchestrator.OrchestratorError as e:

self.log.exception(f"fs:{fs_name} exception while verifying mds status: {e}")

Don't catch AssertionError, we want the module to blow up if that hits.

batrick · 2020-08-04T23:41:05Z

src/pybind/mgr/mds_autoscaler/module.py

+    MDS autoscaler.
+    """
+    def __init__(self, *args, **kwargs):
+        super(MDSAutoscaler, self).__init__(*args, **kwargs)


Suggested change

super(MDSAutoscaler, self).__init__(*args, **kwargs)

MgrModule.__init__(*args, **kwargs)

With multiple inheritance, super is ambiguous. OrchestratorClientMixin has no __init__ method, too.

mchangir · 2020-08-05T03:27:49Z

I'm trying this out with vstart.sh: env MDS=5 ../src/vstart.sh -n -d --cephadm.

I'm seeing the module do some work (with the patches below suggested) but cephadm isn't spawning any new daemons. Have you tried this with vstart.sh?

According to @sebastian-philipp the cephadm will not spawn more than one MDS per host for a filesystem.
So, I typically have virtual machines dedicated for the file-system while running the vstart cluster.
I run 3 VMs to do minimal testing for the test file-system and add the VMs to the orchestrator host list so that cephadm can deploy the MDSs on them.
Also, it does take a while for the container image download and deployment to the VMs.

sebastian-philipp · 2020-08-05T07:46:56Z

I'm trying this out with vstart.sh: env MDS=5 ../src/vstart.sh -n -d --cephadm.

That's not going to work: MDSs deployed by vstart itself aren't managed by cephadm. You're going to need a few VMs at add them as hosts to cephadm. Then you can deploy MDSs on them.

So, something like this should work:

vstart.sh -n --cephadm
ceph orch host add vm-1
ceph orch host add vm-2
ceph orch host add vm-3
ceph orch apply mds count:2

batrick · 2020-08-05T18:22:25Z

I'm trying this out with vstart.sh: env MDS=5 ../src/vstart.sh -n -d --cephadm.
I'm seeing the module do some work (with the patches below suggested) but cephadm isn't spawning any new daemons. Have you tried this with vstart.sh?

According to @sebastian-philipp the cephadm will not spawn more than one MDS per host for a filesystem.

Thanks for reminding me. However, I didn't see cephadm even spawn one daemon on the host. Perhaps it knows that there are MDS it does not manage already on that host (localhost)?

So, I typically have virtual machines dedicated for the file-system while running the vstart cluster.
I run 3 VMs to do minimal testing for the test file-system and add the VMs to the orchestrator host list so that cephadm can deploy the MDSs on them.
Also, it does take a while for the container image download and deployment to the VMs.

Ok. Let's get the patches I've suggested above in then we can merge if @sebastian-philipp is satisfied.

mchangir · 2020-08-06T03:20:51Z

@sebastian-philipp please review

batrick · 2020-08-06T03:30:22Z

Good first milestone. Just waiting on @sebastian-philipp for his final take.

sebastian-philipp

lgtm

sebastian-philipp · 2020-08-06T11:51:27Z

do we have a QA run validating this PR?

mchangir · 2020-08-06T12:19:52Z

do we have a QA run validating this PR?

nope; its been all manual testing so far;
I'll need more time to code up teuthology test cases;

sebastian-philipp · 2020-08-07T11:27:09Z

Checking for unpackaged file(s): /usr/lib/rpm/check-files /home/jenkins-build/build/workspace/ceph-dev-new-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos8/DIST/centos8/MACHINE_SIZE/gigantic/release/16.0.0-4227-gc1ebc86a741/rpm/el8/BUILDROOT/ceph-16.0.0-4227.gc1ebc86a741.el8.x86_64
error: Installed (but unpackaged) file(s) found:
   /usr/share/ceph/mgr/mds_autoscaler/__init__.py
   /usr/share/ceph/mgr/mds_autoscaler/module.py


RPM build errors:
    Installed (but unpackaged) file(s) found:
   /usr/share/ceph/mgr/mds_autoscaler/__init__.py
   /usr/share/ceph/mgr/mds_autoscaler/module.py
+ rm -fr /tmp/install-deps.3816209
Build step 'Execute shell' marked build as failure

https://jenkins.ceph.com/job/ceph-dev-new-build/ARCH=x86_64,AVAILABLE_ARCH=x86_64,AVAILABLE_DIST=centos8,DIST=centos8,MACHINE_SIZE=gigantic/44262//consoleFull

mgr plugin to deploy and configure MDSs in response to degraded file system MDS instance management as per changes to: * 'max_mds' option * 'standby_count_wanted' option * mds liveness and transitions from standby to active mds_autoscaler plugin test credit goes to Sebastian Wagner. Fixes: https://tracker.ceph.com/issues/40929 Signed-off-by: Milind Changire <mchangir@redhat.com>

mchangir · 2020-08-07T11:42:17Z

Checking for unpackaged file(s): /usr/lib/rpm/check-files /home/jenkins-build/build/workspace/ceph-dev-new-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos8/DIST/centos8/MACHINE_SIZE/gigantic/release/16.0.0-4227-gc1ebc86a741/rpm/el8/BUILDROOT/ceph-16.0.0-4227.gc1ebc86a741.el8.x86_64
error: Installed (but unpackaged) file(s) found:
   /usr/share/ceph/mgr/mds_autoscaler/__init__.py
   /usr/share/ceph/mgr/mds_autoscaler/module.py


RPM build errors:
    Installed (but unpackaged) file(s) found:
   /usr/share/ceph/mgr/mds_autoscaler/__init__.py
   /usr/share/ceph/mgr/mds_autoscaler/module.py
+ rm -fr /tmp/install-deps.3816209
Build step 'Execute shell' marked build as failure

https://jenkins.ceph.com/job/ceph-dev-new-build/ARCH=x86_64,AVAILABLE_ARCH=x86_64,AVAILABLE_DIST=centos8,DIST=centos8,MACHINE_SIZE=gigantic/44262//consoleFull

I've added the mds_autoscaler directory to ceph.spec.in.
Please check and let me know if anything else needs fixing.

batrick · 2020-08-10T19:54:51Z

Follow-up work:

mchangir changed the title ~~<!-- Thank you for opening a pull request! Here are some tips on creating a well formatted contribution.~~ mgr/mds_autoscaler: add autoscaling for mds mgmt Jan 20, 2020

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	mds_rank_t get_standby_count_wanted(mds_rank_t standby_daemon_count) const {
	ceph_assert(standby_daemon_count >= 0);
	std::set<mds_rank_t> s;
	get_standby_replay_mds_set(s);
	mds_rank_t standbys_avail = (mds_rank_t)s.size()+standby_daemon_count;
	mds_rank_t wanted = std::max(0, standby_count_wanted);
	return wanted > standbys_avail ? wanted - standbys_avail : 0;
	}
	void set_standby_count_wanted(mds_rank_t n) { standby_count_wanted = n; }

	return fs['mdsmap'].get('standby_count_wanted')
	return fs['mdsmap']['standby_count_wanted']

		except (orchestrator.OrchestratorError, AssertionError) as e:
		self.log.debug(f"fs:{fs_name} exception while verifying mds status: {e!r}")

	super(MDSAutoscaler, self).__init__(args, *kwargs)
	MgrModule.__init__(args, *kwargs)

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sebastian-philipp commented Mar 23, 2020

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mchangir commented Jan 20, 2020 •

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mchangir Jan 27, 2020 •

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liewegas Mar 12, 2020 •

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