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/**
*
* 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.mapreduce;
import java.io.ByteArrayInputStream;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.DataOutput;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.TreeMap;
import java.util.UUID;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellComparator;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.KeyValueUtil;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Durability;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.RegionLocator;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.zookeeper.ZKClusterId;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import org.apache.hadoop.io.RawComparator;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.io.WritableComparator;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Partitioner;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.TaskCounter;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.partition.TotalOrderPartitioner;
import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.zookeeper.KeeperException;
/**
* Import data written by {@link Export}.
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class Import {
private static final Log LOG = LogFactory.getLog(Import.class);
final static String NAME = "import";
public final static String CF_RENAME_PROP = "HBASE_IMPORTER_RENAME_CFS";
public final static String BULK_OUTPUT_CONF_KEY = "import.bulk.output";
public final static String FILTER_CLASS_CONF_KEY = "import.filter.class";
public final static String FILTER_ARGS_CONF_KEY = "import.filter.args";
public final static String TABLE_NAME = "import.table.name";
public final static String WAL_DURABILITY = "import.wal.durability";
public final static String HAS_LARGE_RESULT= "import.bulk.hasLargeResult";
public static class KeyValueWritableComparablePartitioner
extends Partitioner {
private static KeyValueWritableComparable[] START_KEYS = null;
@Override
public int getPartition(KeyValueWritableComparable key, KeyValue value,
int numPartitions) {
for (int i = 0; i < START_KEYS.length; ++i) {
if (key.compareTo(START_KEYS[i]) <= 0) {
return i;
}
}
return START_KEYS.length;
}
}
public static class KeyValueWritableComparable
implements WritableComparable {
private KeyValue kv = null;
private CellComparator cellComparator = new CellComparator();
static {
// register this comparator
WritableComparator.define(KeyValueWritableComparable.class,
new KeyValueWritableComparator());
}
public KeyValueWritableComparable() {
}
public KeyValueWritableComparable(KeyValue kv) {
this.kv = kv;
}
@Override
public void write(DataOutput out) throws IOException {
KeyValue.write(kv, out);
}
@Override
public void readFields(DataInput in) throws IOException {
kv = KeyValue.create(in);
}
@Override
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="EQ_COMPARETO_USE_OBJECT_EQUALS",
justification="This is wrong, yes, but we should be purging Writables, not fixing them")
public int compareTo(KeyValueWritableComparable o) {
return cellComparator.compare(this.kv, ((KeyValueWritableComparable)o).kv);
}
public static class KeyValueWritableComparator extends WritableComparator {
@Override
public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) {
try {
KeyValueWritableComparable kv1 = new KeyValueWritableComparable();
kv1.readFields(new DataInputStream(new ByteArrayInputStream(b1, s1, l1)));
KeyValueWritableComparable kv2 = new KeyValueWritableComparable();
kv2.readFields(new DataInputStream(new ByteArrayInputStream(b2, s2, l2)));
return compare(kv1, kv2);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
}
public static class KeyValueReducer
extends
Reducer {
protected void reduce(
KeyValueWritableComparable row,
Iterable kvs,
Reducer.Context context)
throws java.io.IOException, InterruptedException {
int index = 0;
for (KeyValue kv : kvs) {
context.write(new ImmutableBytesWritable(kv.getRowArray()), kv);
if (++index % 100 == 0)
context.setStatus("Wrote " + index + " KeyValues, "
+ "and the rowkey whose is being wrote is " + Bytes.toString(kv.getRowArray()));
}
}
}
public static class KeyValueSortImporter
extends TableMapper {
private Map cfRenameMap;
private Filter filter;
private static final Log LOG = LogFactory.getLog(KeyValueImporter.class);
/**
* @param row The current table row key.
* @param value The columns.
* @param context The current context.
* @throws IOException When something is broken with the data.
*/
@Override
public void map(ImmutableBytesWritable row, Result value, Context context)
throws IOException {
try {
if (LOG.isTraceEnabled()) {
LOG.trace("Considering the row."
+ Bytes.toString(row.get(), row.getOffset(), row.getLength()));
}
if (filter == null || !filter.filterRowKey(row.get(), row.getOffset(), row.getLength())) {
for (Cell kv : value.rawCells()) {
kv = filterKv(filter, kv);
// skip if we filtered it out
if (kv == null) continue;
// TODO get rid of ensureKeyValue
KeyValue ret = KeyValueUtil.ensureKeyValueTypeForMR(convertKv(kv, cfRenameMap));
context.write(new KeyValueWritableComparable(ret.createKeyOnly(false)), ret);
}
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
@Override
public void setup(Context context) throws IOException {
cfRenameMap = createCfRenameMap(context.getConfiguration());
filter = instantiateFilter(context.getConfiguration());
int reduceNum = context.getNumReduceTasks();
Configuration conf = context.getConfiguration();
TableName tableName = TableName.valueOf(context.getConfiguration().get(TABLE_NAME));
try (Connection conn = ConnectionFactory.createConnection(conf);
RegionLocator regionLocator = conn.getRegionLocator(tableName)) {
byte[][] startKeys = regionLocator.getStartKeys();
if (startKeys.length != reduceNum) {
throw new IOException("Region split after job initialization");
}
KeyValueWritableComparable[] startKeyWraps =
new KeyValueWritableComparable[startKeys.length - 1];
for (int i = 1; i < startKeys.length; ++i) {
startKeyWraps[i - 1] =
new KeyValueWritableComparable(KeyValueUtil.createFirstOnRow(startKeys[i]));
}
KeyValueWritableComparablePartitioner.START_KEYS = startKeyWraps;
}
}
}
/**
* A mapper that just writes out KeyValues.
*/
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="EQ_COMPARETO_USE_OBJECT_EQUALS",
justification="Writables are going away and this has been this way forever")
public static class KeyValueImporter extends TableMapper {
private Map cfRenameMap;
private Filter filter;
private static final Log LOG = LogFactory.getLog(KeyValueImporter.class);
/**
* @param row The current table row key.
* @param value The columns.
* @param context The current context.
* @throws IOException When something is broken with the data.
*/
@Override
public void map(ImmutableBytesWritable row, Result value,
Context context)
throws IOException {
try {
if (LOG.isTraceEnabled()) {
LOG.trace("Considering the row."
+ Bytes.toString(row.get(), row.getOffset(), row.getLength()));
}
if (filter == null || !filter.filterRowKey(row.get(), row.getOffset(), row.getLength())) {
for (Cell kv : value.rawCells()) {
kv = filterKv(filter, kv);
// skip if we filtered it out
if (kv == null) continue;
// TODO get rid of ensureKeyValue
context.write(row, KeyValueUtil.ensureKeyValueTypeForMR(convertKv(kv, cfRenameMap)));
}
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
@Override
public void setup(Context context) {
cfRenameMap = createCfRenameMap(context.getConfiguration());
filter = instantiateFilter(context.getConfiguration());
}
}
/**
* Write table content out to files in hdfs.
*/
public static class Importer extends TableMapper {
private Map cfRenameMap;
private List clusterIds;
private Filter filter;
private Durability durability;
/**
* @param row The current table row key.
* @param value The columns.
* @param context The current context.
* @throws IOException When something is broken with the data.
*/
@Override
public void map(ImmutableBytesWritable row, Result value,
Context context)
throws IOException {
try {
writeResult(row, value, context);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void writeResult(ImmutableBytesWritable key, Result result, Context context)
throws IOException, InterruptedException {
Put put = null;
Delete delete = null;
if (LOG.isTraceEnabled()) {
LOG.trace("Considering the row."
+ Bytes.toString(key.get(), key.getOffset(), key.getLength()));
}
if (filter == null || !filter.filterRowKey(key.get(), key.getOffset(), key.getLength())) {
processKV(key, result, context, put, delete);
}
}
protected void processKV(ImmutableBytesWritable key, Result result, Context context, Put put,
Delete delete) throws IOException, InterruptedException {
for (Cell kv : result.rawCells()) {
kv = filterKv(filter, kv);
// skip if we filter it out
if (kv == null) continue;
kv = convertKv(kv, cfRenameMap);
// Deletes and Puts are gathered and written when finished
/*
* If there are sequence of mutations and tombstones in an Export, and after Import the same
* sequence should be restored as it is. If we combine all Delete tombstones into single
* request then there is chance of ignoring few DeleteFamily tombstones, because if we
* submit multiple DeleteFamily tombstones in single Delete request then we are maintaining
* only newest in hbase table and ignoring other. Check - HBASE-12065
*/
if (CellUtil.isDeleteFamily(kv)) {
Delete deleteFamily = new Delete(key.get());
deleteFamily.addDeleteMarker(kv);
if (durability != null) {
deleteFamily.setDurability(durability);
}
deleteFamily.setClusterIds(clusterIds);
context.write(key, deleteFamily);
} else if (CellUtil.isDelete(kv)) {
if (delete == null) {
delete = new Delete(key.get());
}
delete.addDeleteMarker(kv);
} else {
if (put == null) {
put = new Put(key.get());
}
addPutToKv(put, kv);
}
}
if (put != null) {
if (durability != null) {
put.setDurability(durability);
}
put.setClusterIds(clusterIds);
context.write(key, put);
}
if (delete != null) {
if (durability != null) {
delete.setDurability(durability);
}
delete.setClusterIds(clusterIds);
context.write(key, delete);
}
}
protected void addPutToKv(Put put, Cell kv) throws IOException {
put.add(kv);
}
@Override
public void setup(Context context) {
Configuration conf = context.getConfiguration();
cfRenameMap = createCfRenameMap(conf);
filter = instantiateFilter(conf);
String durabilityStr = conf.get(WAL_DURABILITY);
if(durabilityStr != null){
durability = Durability.valueOf(durabilityStr.toUpperCase(Locale.ROOT));
}
// TODO: This is kind of ugly doing setup of ZKW just to read the clusterid.
ZooKeeperWatcher zkw = null;
Exception ex = null;
try {
zkw = new ZooKeeperWatcher(conf, context.getTaskAttemptID().toString(), null);
clusterIds = Collections.singletonList(ZKClusterId.getUUIDForCluster(zkw));
} catch (ZooKeeperConnectionException e) {
ex = e;
LOG.error("Problem connecting to ZooKeper during task setup", e);
} catch (KeeperException e) {
ex = e;
LOG.error("Problem reading ZooKeeper data during task setup", e);
} catch (IOException e) {
ex = e;
LOG.error("Problem setting up task", e);
} finally {
if (zkw != null) zkw.close();
}
if (clusterIds == null) {
// exit early if setup fails
throw new RuntimeException(ex);
}
}
}
/**
* Create a {@link Filter} to apply to all incoming keys ({@link KeyValue KeyValues}) to
* optionally not include in the job output
* @param conf {@link Configuration} from which to load the filter
* @return the filter to use for the task, or null if no filter to should be used
* @throws IllegalArgumentException if the filter is misconfigured
*/
public static Filter instantiateFilter(Configuration conf) {
// get the filter, if it was configured
Class filterClass = conf.getClass(FILTER_CLASS_CONF_KEY, null, Filter.class);
if (filterClass == null) {
LOG.debug("No configured filter class, accepting all keyvalues.");
return null;
}
LOG.debug("Attempting to create filter:" + filterClass);
String[] filterArgs = conf.getStrings(FILTER_ARGS_CONF_KEY);
ArrayList quotedArgs = toQuotedByteArrays(filterArgs);
try {
Method m = filterClass.getMethod("createFilterFromArguments", ArrayList.class);
return (Filter) m.invoke(null, quotedArgs);
} catch (IllegalAccessException e) {
LOG.error("Couldn't instantiate filter!", e);
throw new RuntimeException(e);
} catch (SecurityException e) {
LOG.error("Couldn't instantiate filter!", e);
throw new RuntimeException(e);
} catch (NoSuchMethodException e) {
LOG.error("Couldn't instantiate filter!", e);
throw new RuntimeException(e);
} catch (IllegalArgumentException e) {
LOG.error("Couldn't instantiate filter!", e);
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
LOG.error("Couldn't instantiate filter!", e);
throw new RuntimeException(e);
}
}
private static ArrayList toQuotedByteArrays(String... stringArgs) {
ArrayList quotedArgs = new ArrayList();
for (String stringArg : stringArgs) {
// all the filters' instantiation methods expected quoted args since they are coming from
// the shell, so add them here, though it shouldn't really be needed :-/
quotedArgs.add(Bytes.toBytes("'" + stringArg + "'"));
}
return quotedArgs;
}
/**
* Attempt to filter out the keyvalue
* @param kv {@link KeyValue} on which to apply the filter
* @return null if the key should not be written, otherwise returns the original
* {@link KeyValue}
*/
public static Cell filterKv(Filter filter, Cell kv) throws IOException {
// apply the filter and skip this kv if the filter doesn't apply
if (filter != null) {
Filter.ReturnCode code = filter.filterKeyValue(kv);
if (LOG.isTraceEnabled()) {
LOG.trace("Filter returned:" + code + " for the key value:" + kv);
}
// if its not an accept type, then skip this kv
if (!(code.equals(Filter.ReturnCode.INCLUDE) || code
.equals(Filter.ReturnCode.INCLUDE_AND_NEXT_COL))) {
return null;
}
}
return kv;
}
// helper: create a new KeyValue based on CF rename map
private static Cell convertKv(Cell kv, Map cfRenameMap) {
if(cfRenameMap != null) {
// If there's a rename mapping for this CF, create a new KeyValue
byte[] newCfName = cfRenameMap.get(CellUtil.cloneFamily(kv));
if(newCfName != null) {
kv = new KeyValue(kv.getRowArray(), // row buffer
kv.getRowOffset(), // row offset
kv.getRowLength(), // row length
newCfName, // CF buffer
0, // CF offset
newCfName.length, // CF length
kv.getQualifierArray(), // qualifier buffer
kv.getQualifierOffset(), // qualifier offset
kv.getQualifierLength(), // qualifier length
kv.getTimestamp(), // timestamp
KeyValue.Type.codeToType(kv.getTypeByte()), // KV Type
kv.getValueArray(), // value buffer
kv.getValueOffset(), // value offset
kv.getValueLength()); // value length
}
}
return kv;
}
// helper: make a map from sourceCfName to destCfName by parsing a config key
private static Map createCfRenameMap(Configuration conf) {
Map cfRenameMap = null;
String allMappingsPropVal = conf.get(CF_RENAME_PROP);
if(allMappingsPropVal != null) {
// The conf value format should be sourceCf1:destCf1,sourceCf2:destCf2,...
String[] allMappings = allMappingsPropVal.split(",");
for (String mapping: allMappings) {
if(cfRenameMap == null) {
cfRenameMap = new TreeMap(Bytes.BYTES_COMPARATOR);
}
String [] srcAndDest = mapping.split(":");
if(srcAndDest.length != 2) {
continue;
}
cfRenameMap.put(srcAndDest[0].getBytes(), srcAndDest[1].getBytes());
}
}
return cfRenameMap;
}
/**
* Sets a configuration property with key {@link #CF_RENAME_PROP} in conf that tells
* the mapper how to rename column families.
*
*
Alternately, instead of calling this function, you could set the configuration key
* {@link #CF_RENAME_PROP} yourself. The value should look like
*
srcCf1:destCf1,srcCf2:destCf2,....
. This would have the same effect on
* the mapper behavior.
*
* @param conf the Configuration in which the {@link #CF_RENAME_PROP} key will be
* set
* @param renameMap a mapping from source CF names to destination CF names
*/
static public void configureCfRenaming(Configuration conf,
Map renameMap) {
StringBuilder sb = new StringBuilder();
for(Map.Entry entry: renameMap.entrySet()) {
String sourceCf = entry.getKey();
String destCf = entry.getValue();
if(sourceCf.contains(":") || sourceCf.contains(",") ||
destCf.contains(":") || destCf.contains(",")) {
throw new IllegalArgumentException("Illegal character in CF names: "
+ sourceCf + ", " + destCf);
}
if(sb.length() != 0) {
sb.append(",");
}
sb.append(sourceCf + ":" + destCf);
}
conf.set(CF_RENAME_PROP, sb.toString());
}
/**
* Add a Filter to be instantiated on import
* @param conf Configuration to update (will be passed to the job)
* @param clazz {@link Filter} subclass to instantiate on the server.
* @param filterArgs List of arguments to pass to the filter on instantiation
*/
public static void addFilterAndArguments(Configuration conf, Class clazz,
List filterArgs) throws IOException {
conf.set(Import.FILTER_CLASS_CONF_KEY, clazz.getName());
conf.setStrings(Import.FILTER_ARGS_CONF_KEY, filterArgs.toArray(new String[filterArgs.size()]));
}
/**
* Sets up the actual job.
* @param conf The current configuration.
* @param args The command line parameters.
* @return The newly created job.
* @throws IOException When setting up the job fails.
*/
public static Job createSubmittableJob(Configuration conf, String[] args)
throws IOException {
TableName tableName = TableName.valueOf(args[0]);
conf.set(TABLE_NAME, tableName.getNameAsString());
Path inputDir = new Path(args[1]);
Job job = new Job(conf, NAME + "_" + tableName);
job.setJarByClass(Importer.class);
FileInputFormat.setInputPaths(job, inputDir);
job.setInputFormatClass(SequenceFileInputFormat.class);
String hfileOutPath = conf.get(BULK_OUTPUT_CONF_KEY);
// make sure we get the filter in the jars
try {
Class filter = conf.getClass(FILTER_CLASS_CONF_KEY, null, Filter.class);
if (filter != null) {
TableMapReduceUtil.addDependencyJarsForClasses(conf, filter);
}
} catch (Exception e) {
throw new IOException(e);
}
if (hfileOutPath != null && conf.getBoolean(HAS_LARGE_RESULT, false)) {
LOG.info("Use Large Result!!");
try (Connection conn = ConnectionFactory.createConnection(conf);
Table table = conn.getTable(tableName);
RegionLocator regionLocator = conn.getRegionLocator(tableName)) {
HFileOutputFormat2.configureIncrementalLoad(job, table.getTableDescriptor(), regionLocator);
job.setMapperClass(KeyValueSortImporter.class);
job.setReducerClass(KeyValueReducer.class);
Path outputDir = new Path(hfileOutPath);
FileOutputFormat.setOutputPath(job, outputDir);
job.setMapOutputKeyClass(KeyValueWritableComparable.class);
job.setMapOutputValueClass(KeyValue.class);
job.getConfiguration().setClass("mapreduce.job.output.key.comparator.class",
KeyValueWritableComparable.KeyValueWritableComparator.class,
RawComparator.class);
Path partitionsPath =
new Path(TotalOrderPartitioner.getPartitionFile(job.getConfiguration()));
FileSystem fs = FileSystem.get(job.getConfiguration());
fs.deleteOnExit(partitionsPath);
job.setPartitionerClass(KeyValueWritableComparablePartitioner.class);
job.setNumReduceTasks(regionLocator.getStartKeys().length);
TableMapReduceUtil.addDependencyJarsForClasses(job.getConfiguration(),
com.google.common.base.Preconditions.class);
}
} else if (hfileOutPath != null) {
job.setMapperClass(KeyValueImporter.class);
try (Connection conn = ConnectionFactory.createConnection(conf);
Table table = conn.getTable(tableName);
RegionLocator regionLocator = conn.getRegionLocator(tableName)){
job.setReducerClass(KeyValueSortReducer.class);
Path outputDir = new Path(hfileOutPath);
FileOutputFormat.setOutputPath(job, outputDir);
job.setMapOutputKeyClass(ImmutableBytesWritable.class);
job.setMapOutputValueClass(KeyValue.class);
HFileOutputFormat2.configureIncrementalLoad(job, table.getTableDescriptor(), regionLocator);
TableMapReduceUtil.addDependencyJarsForClasses(job.getConfiguration(),
com.google.common.base.Preconditions.class);
}
} else {
// No reducers. Just write straight to table. Call initTableReducerJob
// because it sets up the TableOutputFormat.
job.setMapperClass(Importer.class);
TableMapReduceUtil.initTableReducerJob(tableName.getNameAsString(), null, job);
job.setNumReduceTasks(0);
}
return job;
}
/*
* @param errorMsg Error message. Can be null.
*/
private static void usage(final String errorMsg) {
if (errorMsg != null && errorMsg.length() > 0) {
System.err.println("ERROR: " + errorMsg);
}
System.err.println("Usage: Import [options] ");
System.err.println("By default Import will load data directly into HBase. To instead generate");
System.err.println("HFiles of data to prepare for a bulk data load, pass the option:");
System.err.println(" -D" + BULK_OUTPUT_CONF_KEY + "=/path/for/output");
System.err.println("If there is a large result that includes too much KeyValue "
+ "whitch can occur OOME caused by the memery sort in reducer, pass the option:");
System.err.println(" -D" + HAS_LARGE_RESULT + "=true");
System.err
.println(" To apply a generic org.apache.hadoop.hbase.filter.Filter to the input, use");
System.err.println(" -D" + FILTER_CLASS_CONF_KEY + "=");
System.err.println(" -D" + FILTER_ARGS_CONF_KEY + "=");
}
/**
* If the durability is set to {@link Durability#SKIP_WAL} and the data is imported to hbase, we
* need to flush all the regions of the table as the data is held in memory and is also not
* present in the Write Ahead Log to replay in scenarios of a crash. This method flushes all the
* regions of the table in the scenarios of import data to hbase with {@link Durability#SKIP_WAL}
*/
public static void flushRegionsIfNecessary(Configuration conf) throws IOException,
InterruptedException {
String tableName = conf.get(TABLE_NAME);
HBaseAdmin hAdmin = null;
String durability = conf.get(WAL_DURABILITY);
// Need to flush if the data is written to hbase and skip wal is enabled.
if (conf.get(BULK_OUTPUT_CONF_KEY) == null && durability != null
&& Durability.SKIP_WAL.name().equalsIgnoreCase(durability)) {
try {
hAdmin = new HBaseAdmin(conf);
hAdmin.flush(tableName);
} finally {
if (hAdmin != null) {
hAdmin.close();
}
}
}
}
/**
* Main entry point.
*
* @param args The command line parameters.
* @throws Exception When running the job fails.
*/
public static void main(String[] args) throws Exception {
Configuration conf = HBaseConfiguration.create();
String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
if (otherArgs.length < 2) {
usage("Wrong number of arguments: " + otherArgs.length);
System.exit(-1);
}
String inputVersionString = System.getProperty(ResultSerialization.IMPORT_FORMAT_VER);
if (inputVersionString != null) {
conf.set(ResultSerialization.IMPORT_FORMAT_VER, inputVersionString);
}
Job job = createSubmittableJob(conf, otherArgs);
boolean isJobSuccessful = job.waitForCompletion(true);
if(isJobSuccessful){
// Flush all the regions of the table
flushRegionsIfNecessary(conf);
}
long inputRecords = job.getCounters().findCounter(TaskCounter.MAP_INPUT_RECORDS).getValue();
long outputRecords = job.getCounters().findCounter(TaskCounter.MAP_OUTPUT_RECORDS).getValue();
if (outputRecords < inputRecords) {
System.err.println("Warning, not all records were imported (maybe filtered out).");
if (outputRecords == 0) {
System.err.println("If the data was exported from HBase 0.94 "+
"consider using -Dhbase.import.version=0.94.");
}
}
System.exit(isJobSuccessful ? 0 : 1);
}
}