/**
* Add a region to RegionStates with the specified state. If the region is already in
* RegionStates, this call has no effect, and the original state is returned.
*
* @param hri the region info to create a state for
* @param newState the state to the region in set to
* @param serverName the server the region is transitioning on
* @param lastHost the last server that hosts the region
* @return the current state
*/
public synchronized RegionState createRegionState(
final HRegionInfo hri, State newState, ServerName serverName, ServerName lastHost) {
if (newState == null || (newState == State.OPEN && serverName == null)) {
newState = State.OFFLINE;
}
if (hri.isOffline() && hri.isSplit()) {
newState = State.SPLIT;
serverName = null;
}
String encodedName = hri.getEncodedName();
RegionState regionState = regionStates.get(encodedName);
if (regionState != null) {
LOG.warn(
"Tried to create a state for a region already in RegionStates, "
+ "used existing: "
+ regionState
+ ", ignored new: "
+ newState);
} else {
regionState = new RegionState(hri, newState, serverName);
putRegionState(regionState);
if (newState == State.OPEN) {
if (!serverName.equals(lastHost)) {
LOG.warn(
"Open region's last host "
+ lastHost
+ " should be the same as the current one "
+ serverName
+ ", ignored the last and used the current one");
lastHost = serverName;
}
lastAssignments.put(encodedName, lastHost);
regionAssignments.put(hri, lastHost);
} else if (!isOneOfStates(regionState, State.MERGED, State.SPLIT, State.OFFLINE)) {
regionsInTransition.put(encodedName, regionState);
}
if (lastHost != null && newState != State.SPLIT) {
addToServerHoldings(lastHost, hri);
if (newState != State.OPEN) {
oldAssignments.put(encodedName, lastHost);
}
}
}
return regionState;
}
/** Update a region state. It will be put in transition if not already there. */
private RegionState updateRegionState(
final HRegionInfo hri,
final RegionState.State state,
final ServerName serverName,
long openSeqNum) {
if (state == RegionState.State.FAILED_CLOSE || state == RegionState.State.FAILED_OPEN) {
LOG.warn(
"Failed to open/close "
+ hri.getShortNameToLog()
+ " on "
+ serverName
+ ", set to "
+ state);
}
String encodedName = hri.getEncodedName();
RegionState regionState = new RegionState(hri, state, System.currentTimeMillis(), serverName);
RegionState oldState = getRegionState(encodedName);
if (!regionState.equals(oldState)) {
LOG.info("Transition " + oldState + " to " + regionState);
// Persist region state before updating in-memory info, if needed
regionStateStore.updateRegionState(openSeqNum, regionState, oldState);
}
synchronized (this) {
regionsInTransition.put(encodedName, regionState);
putRegionState(regionState);
// For these states, region should be properly closed.
// There should be no log splitting issue.
if ((state == State.CLOSED || state == State.MERGED || state == State.SPLIT)
&& lastAssignments.containsKey(encodedName)) {
ServerName last = lastAssignments.get(encodedName);
if (last.equals(serverName)) {
lastAssignments.remove(encodedName);
} else {
LOG.warn(encodedName + " moved to " + state + " on " + serverName + ", expected " + last);
}
}
// Once a region is opened, record its last assignment right away.
if (serverName != null && state == State.OPEN) {
ServerName last = lastAssignments.get(encodedName);
if (!serverName.equals(last)) {
lastAssignments.put(encodedName, serverName);
if (last != null && isServerDeadAndNotProcessed(last)) {
LOG.warn(
encodedName
+ " moved to "
+ serverName
+ ", while it's previous host "
+ last
+ " is dead but not processed yet");
}
}
}
// notify the change
this.notifyAll();
}
return regionState;
}