/**
* A dead server's wals have been split so that all the regions used to be open on it can be
* safely assigned now. Mark them assignable.
*/
public synchronized void logSplit(final ServerName serverName) {
for (Iterator<Map.Entry<String, ServerName>> it = lastAssignments.entrySet().iterator();
it.hasNext(); ) {
Map.Entry<String, ServerName> e = it.next();
if (e.getValue().equals(serverName)) {
it.remove();
}
}
long now = System.currentTimeMillis();
if (LOG.isDebugEnabled()) {
LOG.debug("Adding to log splitting servers " + serverName);
}
processedServers.put(serverName, Long.valueOf(now));
Configuration conf = server.getConfiguration();
long obsoleteTime = conf.getLong(LOG_SPLIT_TIME, DEFAULT_LOG_SPLIT_TIME);
// Doesn't have to be very accurate about the clean up time
if (now > lastProcessedServerCleanTime + obsoleteTime) {
lastProcessedServerCleanTime = now;
long cutoff = now - obsoleteTime;
for (Iterator<Map.Entry<ServerName, Long>> it = processedServers.entrySet().iterator();
it.hasNext(); ) {
Map.Entry<ServerName, Long> e = it.next();
if (e.getValue().longValue() < cutoff) {
if (LOG.isDebugEnabled()) {
LOG.debug("Removed from log splitting servers " + e.getKey());
}
it.remove();
}
}
}
}
/**
* This is an EXPENSIVE clone. Cloning though is the safest thing to do. Can't let out original
* since it can change and at least the load balancer wants to iterate this exported list. We need
* to synchronize on regions since all access to this.servers is under a lock on this.regions.
*
* @return A clone of current assignments by table.
*/
protected Map<TableName, Map<ServerName, List<HRegionInfo>>> getAssignmentsByTable() {
Map<TableName, Map<ServerName, List<HRegionInfo>>> result =
new HashMap<TableName, Map<ServerName, List<HRegionInfo>>>();
synchronized (this) {
if (!server
.getConfiguration()
.getBoolean(HConstants.HBASE_MASTER_LOADBALANCE_BYTABLE, false)) {
Map<ServerName, List<HRegionInfo>> svrToRegions =
new HashMap<ServerName, List<HRegionInfo>>(serverHoldings.size());
for (Map.Entry<ServerName, Set<HRegionInfo>> e : serverHoldings.entrySet()) {
svrToRegions.put(e.getKey(), new ArrayList<HRegionInfo>(e.getValue()));
}
result.put(TableName.valueOf(HConstants.ENSEMBLE_TABLE_NAME), svrToRegions);
} else {
for (Map.Entry<ServerName, Set<HRegionInfo>> e : serverHoldings.entrySet()) {
for (HRegionInfo hri : e.getValue()) {
if (hri.isMetaRegion()) continue;
TableName tablename = hri.getTable();
Map<ServerName, List<HRegionInfo>> svrToRegions = result.get(tablename);
if (svrToRegions == null) {
svrToRegions = new HashMap<ServerName, List<HRegionInfo>>(serverHoldings.size());
result.put(tablename, svrToRegions);
}
List<HRegionInfo> regions = svrToRegions.get(e.getKey());
if (regions == null) {
regions = new ArrayList<HRegionInfo>();
svrToRegions.put(e.getKey(), regions);
}
regions.add(hri);
}
}
}
}
Map<ServerName, ServerLoad> onlineSvrs = serverManager.getOnlineServers();
// Take care of servers w/o assignments, and remove servers in draining mode
List<ServerName> drainingServers = this.serverManager.getDrainingServersList();
for (Map<ServerName, List<HRegionInfo>> map : result.values()) {
for (ServerName svr : onlineSvrs.keySet()) {
if (!map.containsKey(svr)) {
map.put(svr, new ArrayList<HRegionInfo>());
}
}
map.keySet().removeAll(drainingServers);
}
return result;
}
/**
* This method does an RPC to hbase:meta. Do not call this method with a lock/synchronize held.
*
* @param hris The hris to check if empty in hbase:meta and if so, clean them up.
*/
private void cleanIfNoMetaEntry(Set<HRegionInfo> hris) {
if (hris.isEmpty()) return;
for (HRegionInfo hri : hris) {
try {
// This is RPC to meta table. It is done while we have a synchronize on
// regionstates. No progress will be made if meta is not available at this time.
// This is a cleanup task. Not critical.
if (MetaTableAccessor.getRegion(server.getConnection(), hri.getEncodedNameAsBytes())
== null) {
regionOffline(hri);
FSUtils.deleteRegionDir(server.getConfiguration(), hri);
}
} catch (IOException e) {
LOG.warn("Got exception while deleting " + hri + " directories from file system.", e);
}
}
}
