Classifier looks at list of inner ring nodes and container
nodes from current and previous epoch to classify request.
Sometimes these checks might return error.
Consider there is a request from unknown key and container's
placement policy valid for current epoch and invalid for past
epoch. Classifier tries to find if key belongs to container
node from current epoch -- it is not. Then it tries to find if
key belongs to container node from past epoch and it throws
error, because placement policy is invalid for past epoch.
This is a legit case and classifier should ignore such errors
to provide best effort in matching. The only error classifier
should return is an error when request does not contain
public key to classify it.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
Implement NodeState interface required by Netmap service. Make a single
point of updating the state of the node (for both Netmap and Control
services). Protect node info structure from data race.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Call Netmap contract on SetNetmapStatus rpc of Control service (AddPeer
method if new status is ONLINE, UpdatePeerState method otherwise).
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Switch health status to:
* STARTING after the initialization of app resources and before bootup;
* READY after bootup and until shutting down;
* SHUTTING_DOWN before exiting the application.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Update node network status via update status by getting the latest network
map and finding the node in it. This step is performed at the start of the
application and upon notification of a new epoch.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Implement methods required for signatures. Receive network map from netmap
storage, convert it to Control service message and return in response.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Implement HealthChecker on node app structure. Set health status to ONLINE
after node boot. Set health status to OFFLINE on shutdown.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Application should support several NEO endpoints so it can
switch between different RPC nodes when they fail. Application
iterates over endpoints in random order so the default list of
endpoints distribute workload kinda uniformly.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
As in #72 storage application should behave the same way at remote
RPC node failures. The simplest way is to restart application. Later
we can reinitialize it without downtime.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
Support processing of NetmapEpoch and NetmapLookupDepth X-headers when
processing object read operations. Placement for operations
Get/Head/GetRange/GetRangeHash/Search is built for the epoch specified in
NetmapEpoch X-header (by default latest). Also the specified operations are
processed until success is achieved for network maps from the past up to
NetmapLookupDepth value. Behavior for default values (zero or missing) left
unchanged.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Transfer the state of the node to offline when the application is shut down.
Updating the state is done by calling UpdateState method of Netmap contract.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
