If a node is restarted and it had already joined the cluster,
ignore and log that the join urls are being ignored and existing
cluster state will be used.
This removes all join URLs from the config. To join a node to a
cluster, the URL of another member of the cluster should be passed
on the command line w/ the -join flag. The join URLs can now be
any node regardless of whether the node is a broker only or data
only node. At join time, the receiving node will redirect the
request to a valid broker or data node if it cannot handle the request
itself.
To add a new data node, it currently needs a broker
and another data node to join. Temporarily adding
a JoinURLs option to the Data node section so a
standalone data node can be created but the intent is
that this will be removed.
Ideally, the the joinURL could point to either a data node
or a broker and it would get the required URLs from that
host but that is not possible currently.
When a data node starts up, the broker URLs were not set before
they were actually being used. The call to client.Open() in
turn triggers the raft streamer and heartbeat which try to connect
to the broker. If those started before the subsequent client.SetURLs()
call, you would see the following error in the logs at startup:
[messaging] 2015/04/01 11:59:22 reconnecting to broker: url={ <nil> /messaging/messages index=2&streaming=true&topicID=0 }, err=Get /messaging/messages?index=2&streaming=true&topicID=0: unsupported protocol scheme ""
Fixing this race uncovered another bug where the join urls would be
cleared the first time the broker was started. In this case, the
join urls should be left alone since they were set properly w/ SetURLs.
Fixes#2152
This is a pre-requisite for #1934. When running separate
broker and data nodes, you currently need to know what role
a host is performing. This complicates cluster setup in
that you must configure separate broker URLs and data node
URLs.
This change allows a broker only node to redirect data nodes endpoints
to a valid data node and a data only node to redirect broker
endpoints to a valid broker.
This sends data node urls via the broker heartbeat from each data
node. The urls are tracked on the broker to support simpler
cluster setup as well as distributed queries.
This commit adds the "influxd restore" command to the CLI. This allows
a snapshot that has been produced by "influxd backup" to be restored
to a config location and the broker and raft directories will be
bootstrapped based on the state of the snapshot.
This commit adds the backup command to the influxd binary as well as
implements a SnapshotWriter in the influxdb package.
By default the snapshot handler binds to 127.0.0.1 so it cannot be
accessed outside of the local machine.
*config was always non-null, since code at a higher level ensures that a
default config is passed down if no config is specified. So this logic
was pointless.
Cory LaNou
Jason Wilder
Philip O'Toole
Tristan Colgate-McFarlane
Philip O'Toole
Ben Johnson
Grégory Starck