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Server functionality for HBase
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* 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,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.regionserver;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
/**
* Used to unssign a region when we hit FNFE.
*/
@InterfaceAudience.Private
class RegionUnassigner {
private static final Log LOG = LogFactory.getLog(RegionUnassigner.class);
private final RegionServerServices rsServices;
private final HRegionInfo regionInfo;
private boolean unassigning = false;
RegionUnassigner(RegionServerServices rsServices, HRegionInfo regionInfo) {
this.rsServices = rsServices;
this.regionInfo = regionInfo;
}
synchronized void unassign() {
if (unassigning) {
return;
}
unassigning = true;
new Thread("RegionUnassigner." + regionInfo.getEncodedName()) {
@Override
public void run() {
LOG.info("Unassign " + regionInfo.getRegionNameAsString());
try {
rsServices.unassign(regionInfo.getRegionName());
} catch (IOException e) {
LOG.warn("Unassigned " + regionInfo.getRegionNameAsString() + " failed", e);
} finally {
synchronized (RegionUnassigner.this) {
unassigning = false;
}
}
}
}.start();
}
}