/**
* Force the configuration master to install a new view. This method should only be called during
* testing.
*
* @param v The new view to install.
*/
@Override
public void forceNewView(CorfuDBView v) {
try {
JSONRPC2Request jr = new JSONRPC2Request("newview", id.getAndIncrement());
Map<String, Object> params = new HashMap<String, Object>();
params.put("newview", v.getSerializedJSONView().toString());
jr.setNamedParams(params);
JSONRPC2Response jres = jsonSession.send(jr);
if (jres.indicatesSuccess() && (Boolean) jres.getResult()) {}
} catch (Exception e) {
}
}
@Override
public CorfuDBView getNewView(CorfuDBView oldView, NetworkException e) {
/* it's null, don't change anything */
if (e == null) {
return oldView;
}
/* Is the exception for a Logging Unit? */
if (e.protocol instanceof IWriteOnceLogUnit) {
/* Okay, so was it a read or a write? */
if (e.write) {
/* in the case of a write, find the segment belonging to the protocol,
and remove that protocol from the segment.
*/
CorfuDBView newView = (CorfuDBView) Serializer.copyShallow(oldView);
for (CorfuDBViewSegment segment : newView.getSegments()) {
for (List<IServerProtocol> nodeList : segment.getGroups()) {
if (nodeList.size() > 1) {
nodeList.removeIf(n -> n.getFullString().equals(e.protocol.getFullString()));
}
}
}
log.info("Reconfiguring all nodes in view to new epoch " + oldView.getEpoch() + 1);
newView.moveAllToNewEpoch(oldView.getEpoch() + 1);
return newView;
}
/* for reads, we don't do anything, for now...
*/
log.warn("Reconfigure due to read, ignoring");
return oldView;
} else if (e.protocol instanceof ISimpleSequencer) {
if (oldView.getSequencers().size() <= 1) {
log.warn(
"Request reconfiguration of sequencers but there is no fail-over available! [available sequencers="
+ oldView.getSequencers().size()
+ "]");
return oldView;
} else {
CorfuDBView newView = (CorfuDBView) Serializer.copyShallow(oldView);
newView.moveAllToNewEpoch(oldView.getEpoch() + 1);
/* Interrogate each log unit to figure out last issued token */
long last = -1;
for (CorfuDBViewSegment segment : newView.getSegments()) {
int groupNum = 1;
for (List<IServerProtocol> nodeList : segment.getGroups()) {
for (IServerProtocol n : nodeList) {
try {
last =
Long.max(
last,
((IWriteOnceLogUnit) n).highestAddress() * segment.getGroups().size()
+ groupNum);
} catch (NetworkException ne) {
}
}
groupNum++;
}
}
log.warn(
"Removing sequencer "
+ e.protocol.getFullString()
+ " from configuration, discover last sequence was "
+ last);
newView.getSequencers().removeIf(n -> n.getFullString().equals(e.protocol.getFullString()));
try {
((ISimpleSequencer) newView.getSequencers().get(0)).recover(last);
} catch (Exception ex) {
log.warn("Tried to install recovered sequence from sequencer, but failed", e);
}
return newView;
}
} else {
log.warn("Request reconfiguration for protocol we don't know how to reconfigure", e.protocol);
return (CorfuDBView) Serializer.copyShallow(oldView);
}
}