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Fix issue where node connection map wasn't being pruned #4231

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merged 2 commits into from
Apr 27, 2018
Merged

Fix issue where node connection map wasn't being pruned #4231

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0c0fa40
Fix issue where node connection map wasn't being pruned
dadgar Apr 27, 2018
5cd1ff4
small cleanup and logging
dadgar Apr 27, 2018
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16 changes: 15 additions & 1 deletion nomad/client_rpc.go
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,12 @@ func (s *Server) getNodeConn(nodeID string) (*nodeConnState, bool) {
}
}

// Shouldn't happen but rather be safe
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Can we dream up a reason this is possible? If not should we add a debug or trace log just in case it can help us find where an invariant is being broken.

if state == nil {
s.logger.Printf("[WARN] nomad.client_rpc: node %q exists in node connection map without any connection", nodeID)
return nil, false
}

return state, ok
}

Expand Down Expand Up @@ -111,7 +117,15 @@ func (s *Server) removeNodeConn(ctx *RPCContext) {
for i, conn := range conns {
if conn.Ctx.Conn.LocalAddr().String() == ctx.Conn.LocalAddr().String() &&
conn.Ctx.Conn.RemoteAddr().String() == ctx.Conn.RemoteAddr().String() {
s.nodeConns[ctx.NodeID] = append(s.nodeConns[ctx.NodeID][:i], s.nodeConns[ctx.NodeID][i+1:]...)

if len(conns) == 1 {
// We are deleting the last conn, remove it from the map
delete(s.nodeConns, ctx.NodeID)
} else {
// Slice out the connection we are deleting
s.nodeConns[ctx.NodeID] = append(s.nodeConns[ctx.NodeID][:i], s.nodeConns[ctx.NodeID][i+1:]...)
}

return
}
}
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3 changes: 3 additions & 0 deletions nomad/client_rpc_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -77,6 +77,9 @@ func TestServer_removeNodeConn_differentAddrs(t *testing.T) {
// Delete the second
s1.removeNodeConn(ctx2)
require.Len(s1.connectedNodes(), 0)

_, ok = s1.getNodeConn(nodeID)
require.False(ok)
}

func TestServerWithNodeConn_NoPath(t *testing.T) {
Expand Down