org.apache.hadoop.hive.hbase.HBaseTableSnapshotInputFormatUtil Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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.hive.hbase;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.mapreduce.TableSnapshotInputFormatImpl;
import org.apache.hadoop.mapred.InputSplit;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
/**
* A helper class to isolate newer HBase features from users running against older versions of
* HBase that don't provide those features.
*
* TODO: remove this class when it's okay to drop support for earlier version of HBase.
*/
public class HBaseTableSnapshotInputFormatUtil {
private static final Logger LOG = LoggerFactory.getLogger(HBaseTableSnapshotInputFormatUtil.class);
/** The class we look for to determine if hbase snapshots are supported. */
private static final String TABLESNAPSHOTINPUTFORMAT_CLASS
= "org.apache.hadoop.hbase.mapreduce.TableSnapshotInputFormatImpl";
private static final String TABLESNAPSHOTREGIONSPLIT_CLASS
= "org.apache.hadoop.hbase.mapred.TableSnapshotInputFormat$TableSnapshotRegionSplit";
/** True when {@link #TABLESNAPSHOTINPUTFORMAT_CLASS} is present. */
private static final boolean SUPPORTS_TABLE_SNAPSHOTS;
static {
boolean support = false;
try {
Class clazz = Class.forName(TABLESNAPSHOTINPUTFORMAT_CLASS);
support = clazz != null;
} catch (ClassNotFoundException e) {
// pass
}
SUPPORTS_TABLE_SNAPSHOTS = support;
}
/** Return true when the HBase runtime supports {@link HiveHBaseTableSnapshotInputFormat}. */
public static void assertSupportsTableSnapshots() {
if (!SUPPORTS_TABLE_SNAPSHOTS) {
throw new RuntimeException("This version of HBase does not support Hive over table " +
"snapshots. Please upgrade to at least HBase 0.98.3 or later. See HIVE-6584 for details.");
}
}
/**
* Configures {@code conf} for the snapshot job. Call only when
* {@link #assertSupportsTableSnapshots()} returns true.
*/
public static void configureJob(Configuration conf, String snapshotName, Path restoreDir)
throws IOException {
TableSnapshotInputFormatImpl.setInput(conf, snapshotName, restoreDir);
}
/**
* Create a bare TableSnapshotRegionSplit. Needed because Writables require a
* default-constructed instance to hydrate from the DataInput.
*
* TODO: remove once HBASE-11555 is fixed.
*/
public static InputSplit createTableSnapshotRegionSplit() {
try {
assertSupportsTableSnapshots();
} catch (RuntimeException e) {
LOG.debug("Probably don't support table snapshots. Returning null instance.", e);
return null;
}
try {
Class resultType =
(Class) Class.forName(TABLESNAPSHOTREGIONSPLIT_CLASS);
Constructor cxtor = resultType.getDeclaredConstructor(new Class[]{});
cxtor.setAccessible(true);
return cxtor.newInstance(new Object[]{});
} catch (ClassNotFoundException e) {
throw new UnsupportedOperationException(
"Unable to find " + TABLESNAPSHOTREGIONSPLIT_CLASS, e);
} catch (IllegalAccessException e) {
throw new UnsupportedOperationException(
"Unable to access specified class " + TABLESNAPSHOTREGIONSPLIT_CLASS, e);
} catch (InstantiationException e) {
throw new UnsupportedOperationException(
"Unable to instantiate specified class " + TABLESNAPSHOTREGIONSPLIT_CLASS, e);
} catch (InvocationTargetException e) {
throw new UnsupportedOperationException(
"Constructor threw an exception for " + TABLESNAPSHOTREGIONSPLIT_CLASS, e);
} catch (NoSuchMethodException e) {
throw new UnsupportedOperationException(
"Unable to find suitable constructor for class " + TABLESNAPSHOTREGIONSPLIT_CLASS, e);
}
}
}