Spark中有没有办法只提取分区列名?
我使用的解决方法是使用show extended table like table_name
HiveContext
”
答案 0 :(得分:7)
您可以使用课程HiveMetaStoreClient直接从HiveMetaStore
进行查询。
这个类也被流行的APIS广泛使用,用于与之交互
例如HiveMetaStore
:Apache Drill
org.apache.hadoop.hive.metastore.api.Partition getPartition (String db_name,String tbl_name,List part_vals)
org.apache.hadoop.hive.metastore.api.Partition getPartition (String db,String tableName,String partName) 地图>的 getPartitionColumnStatistics 强>(字符串 dbName,String tableName,List partNames,List colNames)
获取给定dbName,tableName,多个分区和colName -s
的分区列统计信息列出 getPartitionsByNames (字符串 db_name,String tbl_name,List part_names) 通过分区名称列表获取分区。
此外,还有列表方法..
列表listPartitionNames(String db_name,String tbl_name, 列出part_vals,简短max_parts)
列表listPartitionNames(String dbName,String tblName,short 最大)
列表listPartitions(String db_name,String tbl_name,List part_vals,short max_parts)
列表listPartitions(String db_name,String tbl_name,short max_parts)
import org.apache.hadoop.hive.conf.HiveConf;
// test program
public class Test {
public static void main(String[] args){
HiveConf hiveConf = new HiveConf();
hiveConf.setIntVar(HiveConf.ConfVars.METASTORETHRIFTCONNECTIONRETRIES, 3);
hiveConf.setVar(HiveConf.ConfVars.METASTOREURIS, "thrift://host:port");
HiveMetaStoreConnector hiveMetaStoreConnector = new HiveMetaStoreConnector(hiveConf);
if(hiveMetaStoreConnector != null){
System.out.print(hiveMetaStoreConnector.getAllPartitionInfo("tablename"));
}
}
}
// define a class like this
import com.google.common.base.Joiner;
import com.google.common.collect.Lists;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.HiveMetaStoreClient;
import org.apache.hadoop.hive.metastore.api.FieldSchema;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.metastore.api.Partition;
import org.apache.hadoop.hive.metastore.api.hive_metastoreConstants;
import org.apache.hadoop.hive.ql.metadata.Hive;
import org.apache.thrift.TException;
import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class HiveMetaStoreConnector {
private HiveConf hiveConf;
HiveMetaStoreClient hiveMetaStoreClient;
public HiveMetaStoreConnector(String msAddr, String msPort){
try {
hiveConf = new HiveConf();
hiveConf.setVar(HiveConf.ConfVars.METASTOREURIS, msAddr+":"+ msPort);
hiveMetaStoreClient = new HiveMetaStoreClient(hiveConf);
} catch (MetaException e) {
e.printStackTrace();
System.err.println("Constructor error");
System.err.println(e.toString());
System.exit(-100);
}
}
public HiveMetaStoreConnector(HiveConf hiveConf){
try {
this.hiveConf = hiveConf;
hiveMetaStoreClient = new HiveMetaStoreClient(hiveConf);
} catch (MetaException e) {
e.printStackTrace();
System.err.println("Constructor error");
System.err.println(e.toString());
System.exit(-100);
}
}
public String getAllPartitionInfo(String dbName){
List<String> res = Lists.newArrayList();
try {
List<String> tableList = hiveMetaStoreClient.getAllTables(dbName);
for(String tableName:tableList){
res.addAll(getTablePartitionInformation(dbName,tableName));
}
} catch (MetaException e) {
e.printStackTrace();
System.out.println("getAllTableStatistic error");
System.out.println(e.toString());
System.exit(-100);
}
return Joiner.on("\n").join(res);
}
public List<String> getTablePartitionInformation(String dbName, String tableName){
List<String> partitionsInfo = Lists.newArrayList();
try {
List<String> partitionNames = hiveMetaStoreClient.listPartitionNames(dbName,tableName, (short) 10000);
List<Partition> partitions = hiveMetaStoreClient.listPartitions(dbName,tableName, (short) 10000);
for(Partition partition:partitions){
StringBuffer sb = new StringBuffer();
sb.append(tableName);
sb.append("\t");
List<String> partitionValues = partition.getValues();
if(partitionValues.size()<4){
int size = partitionValues.size();
for(int j=0; j<4-size;j++){
partitionValues.add("null");
}
}
sb.append(Joiner.on("\t").join(partitionValues));
sb.append("\t");
DateTime createDate = new DateTime((long)partition.getCreateTime()*1000);
sb.append(createDate.toString("yyyy-MM-dd HH:mm:ss"));
partitionsInfo.add(sb.toString());
}
} catch (TException e) {
e.printStackTrace();
return Arrays.asList(new String[]{"error for request on" + tableName});
}
return partitionsInfo;
}
public String getAllTableStatistic(String dbName){
List<String> res = Lists.newArrayList();
try {
List<String> tableList = hiveMetaStoreClient.getAllTables(dbName);
for(String tableName:tableList){
res.addAll(getTableColumnsInformation(dbName,tableName));
}
} catch (MetaException e) {
e.printStackTrace();
System.out.println("getAllTableStatistic error");
System.out.println(e.toString());
System.exit(-100);
}
return Joiner.on("\n").join(res);
}
public List<String> getTableColumnsInformation(String dbName, String tableName){
try {
List<FieldSchema> fields = hiveMetaStoreClient.getFields(dbName, tableName);
List<String> infs = Lists.newArrayList();
int cnt = 0;
for(FieldSchema fs : fields){
StringBuffer sb = new StringBuffer();
sb.append(tableName);
sb.append("\t");
sb.append(cnt);
sb.append("\t");
cnt++;
sb.append(fs.getName());
sb.append("\t");
sb.append(fs.getType());
sb.append("\t");
sb.append(fs.getComment());
infs.add(sb.toString());
}
return infs;
} catch (TException e) {
e.printStackTrace();
System.out.println("getTableColumnsInformation error");
System.out.println(e.toString());
System.exit(-100);
return null;
}
}
}
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.HiveMetaStoreClient;
import org.apache.hadoop.hive.metastore.api.Database;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.metastore.api.NoSuchObjectException;
import org.apache.hive.hcatalog.common.HCatUtil;
import org.apache.thrift.TException;
import javax.xml.crypto.Data;
import java.io.IOException;
import java.util.HashMap;
public class HiveMetaStoreClientTest {
public static void main(String[] args) {
HiveConf hiveConf = null;
HiveMetaStoreClient hiveMetaStoreClient = null;
String dbName = null;
try {
hiveConf = HCatUtil.getHiveConf(new Configuration());
hiveMetaStoreClient = new HiveMetaStoreClient(hiveConf);
dbName = args[0];
getDatabase(hiveMetaStoreClient, dbName);
} catch (MetaException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (NoSuchObjectException e) {
e.printStackTrace();
System.out.println("===============");
System.out.println("database " + args[0] + "not exists");
System.out.println("===============");
createDatabase(hiveMetaStoreClient, dbName);
try {
getDatabase(hiveMetaStoreClient, dbName);
} catch (TException e1) {
e1.printStackTrace();
System.out.println("TMD");
}
} catch (TException e) {
e.printStackTrace();
}
}
public static Database getDatabase(HiveMetaStoreClient hiveMetaStoreClient, String dbName) throws TException {
Database database = null;
database = hiveMetaStoreClient.getDatabase(dbName);
System.out.println(database.getLocationUri());
System.out.println(database.getOwnerName());
for (String key : database.getParameters().keySet()) {
System.out.println(key + " = " + database.getParameters().get(key));
}
return database;
}
public static Database createDatabase(HiveMetaStoreClient hiveMetaStoreClient, String dbName) {
HashMap<String, String> map = new HashMap<String,String>();
Database database = new Database(dbName, "desc", null, map);
try {
hiveMetaStoreClient.createDatabase(database);
} catch (TException e) {
e.printStackTrace();
System.out.println("some error");
}
return database;
}
}