org.apache.hadoop.hbase.exceptions.RegionMovedException Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.exceptions;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.NotServingRegionException;
import org.apache.hadoop.hbase.ServerName;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.yetus.audience.InterfaceStability;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Subclass if the server knows the region is now on another server. This allows the client to call
* the new region server without calling the master.
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class RegionMovedException extends NotServingRegionException {
private static final Logger LOG = LoggerFactory.getLogger(RegionMovedException.class);
private static final long serialVersionUID = -7232903522310558396L;
private final String hostname;
private final int port;
private final long startCode;
private final long locationSeqNum;
private static final String HOST_FIELD = "hostname=";
private static final String PORT_FIELD = "port=";
private static final String STARTCODE_FIELD = "startCode=";
private static final String LOCATIONSEQNUM_FIELD = "locationSeqNum=";
public RegionMovedException(ServerName serverName, long locationSeqNum) {
this.hostname = serverName.getHostname();
this.port = serverName.getPort();
this.startCode = serverName.getStartcode();
this.locationSeqNum = locationSeqNum;
}
public String getHostname() {
return hostname;
}
public int getPort() {
return port;
}
public ServerName getServerName() {
return ServerName.valueOf(hostname, port, startCode);
}
public long getLocationSeqNum() {
return locationSeqNum;
}
/**
* For hadoop.ipc internal call. Do NOT use. We have to parse the hostname to recreate the
* exception. The input is the one generated by {@link #getMessage()}
*/
public RegionMovedException(String s) {
int posHostname = s.indexOf(HOST_FIELD) + HOST_FIELD.length();
int posPort = s.indexOf(PORT_FIELD) + PORT_FIELD.length();
int posStartCode = s.indexOf(STARTCODE_FIELD) + STARTCODE_FIELD.length();
int posSeqNum = s.indexOf(LOCATIONSEQNUM_FIELD) + LOCATIONSEQNUM_FIELD.length();
String tmpHostname = null;
int tmpPort = -1;
long tmpStartCode = -1;
long tmpSeqNum = HConstants.NO_SEQNUM;
try {
// TODO: this whole thing is extremely brittle.
tmpHostname = s.substring(posHostname, s.indexOf(' ', posHostname));
tmpPort = Integer.parseInt(s.substring(posPort, s.indexOf(' ', posPort)));
tmpStartCode = Long.parseLong(s.substring(posStartCode, s.indexOf('.', posStartCode)));
tmpSeqNum = Long.parseLong(s.substring(posSeqNum, s.indexOf('.', posSeqNum)));
} catch (Exception ignored) {
LOG.warn(
"Can't parse the hostname, port and startCode from this string: " + s + ", continuing");
}
hostname = tmpHostname;
port = tmpPort;
startCode = tmpStartCode;
locationSeqNum = tmpSeqNum;
}
@Override
public String getMessage() {
// TODO: deserialization above depends on this. That is bad, but also means this
// should be modified carefully.
return "Region moved to: " + HOST_FIELD + hostname + " " + PORT_FIELD + port + " "
+ STARTCODE_FIELD + startCode + ". As of " + LOCATIONSEQNUM_FIELD + locationSeqNum + ".";
}
}