- Using this project one can perform CRUD operations from Java applications with HBase or MaprDB.
- Entity pojo design structure should follow below convention:
- field names must follow pattern: columnfamily_column
- Type could be: String, short, Short, int, Integer, long, Long, float, Float, double, Double, boolean, Boolean
- if any column family is supposed to take variable number or name of columns (which are not known upfront) so as to follow dynamic schema, then that field has to be defined as a Map<String,String>
- Field Naming structure for these would be columnfamily
- Entity class MUST be annotated with: @DynamicColumnFamily
- the field MUST be added to fields array of @DynamicColumnFamily
- Declare getter/setter methods for all fields
- Entity POJO MUST implement KVPersistable interface
- Have a look @ class com.mitti.models.SampleEntity
- field names must follow pattern: columnfamily_column
@DynamicColumnFamily(fields = { "varcf" })
public class SampleEntity implements KVPersistable {
private String row_key;
/*
* ColumnFamily: basic Column: name
*/
private String basic_name;
/*
* ColumnFamily: basic Column: age
*/
private int basic_age;
/*
* ColumnFamily: other Column: entity_score
*/
private float other_entity_score;
/*
* ColumnFamily: other Column: done_flag
*/
private Boolean other_done_flag;
/*
* ColumnFamily: varcf Column: this can support variable number of columns by
* this declaration. This would help in cases for flexible schema.
*/
private Map<String, String> varcf;
/*
* ColumnFamily: varcf Column: fixed_value
*
* Dynamic column family may also contain fixed fields apart from variable
* fields
*/
private String varcf_fixed_value;
@Override
public String getRow_key() {
return row_key;
}
@Override
public void setRow_key(String row_key) {
this.row_key = row_key;
}
public String getBasic_name() {
return basic_name;
}
public void setBasic_name(String basic_name) {
this.basic_name = basic_name;
}
public int getBasic_age() {
return basic_age;
}
public void setBasic_age(int basic_age) {
this.basic_age = basic_age;
}
public float getOther_entity_score() {
return other_entity_score;
}
public void setOther_entity_score(float other_entity_score) {
this.other_entity_score = other_entity_score;
}
public Map<String, String> getVarcf() {
return varcf;
}
public void setVarcf(Map<String, String> varcf) {
this.varcf = varcf;
}
public Boolean getOther_done_flag() {
return other_done_flag;
}
public void setOther_done_flag(Boolean other_done_flag) {
this.other_done_flag = other_done_flag;
}
public String getVarcf_fixed_value() {
return varcf_fixed_value;
}
public void setVarcf_fixed_value(String varcf_fixed_value) {
this.varcf_fixed_value = varcf_fixed_value;
}
}- JAVA: 1.8
- HBASE: 2.0.0
- HADOOP: 2.6.5
- Build the maven project.
- Use the mitti-hbase-0.0.1.jar in your projects as dependency.
- Instantiate HbaseDriver class and use it for CRUD operations.
- Create the entity table before performing CRUD operations:
- Update application.properties under resources as per your cluster
hbase.usemaprdb=false
hbase.maprdb.path=maprfs:///mapr/db/warehouse/dev/
hbase.zookeeper.quorum=localhost
hbase.zookeeper.property.clientPort=2181
-
Run App.java to test entity creation:
-
More examples on using the CRUD operations can be seen in HbaseDriverTest
Hbase driver supports following operations:
- addUpdate a single entity
public <T extends KVPersistable> boolean addUpdate(T t, java.lang.String queryTable, java.lang.Class<T> entityClass)- addUpdate a list of entities in one call
public <T extends KVPersistable> boolean addUpdateAll(java.util.List<T> arrT, java.lang.String queryTable, java.lang.Class<T> entityClass)- delete a row from table by rowkey
public boolean deleteById(java.lang.String row_key, java.lang.String queryTable)- delete rows from table based on a Filter
public <T extends KVPersistable> boolean deleteByFilter(java.lang.String queryTable, java.lang.Class<T> entityClass, org.apache.hadoop.hbase.filter.Filter filter)- delete a selected list of columns under a column family for a given row key
public boolean deleteColumnsById(java.lang.String row_key, java.lang.String queryTable, java.lang.String columnFamily, java.lang.String... columns)- Get all rows from a table
public <T extends KVPersistable> java.util.List<T> query(java.lang.String table, java.lang.Class<T> entityClass)- Get row from a table based on key
public <T extends KVPersistable> T query(java.lang.String row_key, java.lang.String table, java.lang.Class<T> entityClass)- Get rows from a table based on matching filter
public <T extends KVPersistable> java.util.List<T> query(java.lang.String table, java.lang.Class<T> entityClass, org.apache.hadoop.hbase.filter.Filter filter)- Get rows from a table based on matching filter and staring rowkey (inclusive)
public <T extends KVPersistable> java.util.List<T> query(java.lang.String table, java.lang.Class<T> entityClass, org.apache.hadoop.hbase.filter.Filter filter, java.lang.String startRow)- Get row from a table based on key and provided filter
public <T extends KVPersistable> T query(java.lang.String row_key, java.lang.String table, java.lang.Class<T> entityClass, org.apache.hadoop.hbase.filter.Filter filter)- Get rows from a table based on provided filter list
public <T extends KVPersistable> java.util.List<T> query(java.lang.String table, java.lang.Class<T> entityClass, org.apache.hadoop.hbase.filter.FilterList filterlist)- Get rows from a table based on provided filter list with starting rowkey (inclusive) and ending rowkey (exclusive)
public <T extends KVPersistable> java.util.List<T> query(java.lang.String table, java.lang.Class<T> entityClass, org.apache.hadoop.hbase.filter.FilterList filterlist, java.lang.String startRow, java.lang.String endRow)- Get row from a table for given rowkey and provided filter list
public <T extends KVPersistable> T query(java.lang.String row_key, java.lang.String table, java.lang.Class<T> entityClass, org.apache.hadoop.hbase.filter.FilterList filterlist)- Get a selected list of columns (row key included implicitly) based on provided filter
public <T extends KVPersistable> java.util.List<java.util.Map<java.lang.String,java.lang.Object>> query(java.lang.String table, java.lang.Class<T> entityClass, org.apache.hadoop.hbase.filter.Filter filter, java.lang.String... columns)- Get a selected list of columns (row key included implicitly) for all rows
public <T extends KVPersistable> java.util.List<java.util.Map<java.lang.String,java.lang.Object>> query(java.lang.String table, java.lang.Class<T> entityClass, java.lang.String... columns)- Get a selected list of columns (row key included implicitly) for given row key
public <T extends KVPersistable> java.util.Map<java.lang.String,java.lang.Object> query(java.lang.String row_key, java.lang.String table, java.lang.Class<T> entityClass, java.lang.String... columns)- Get a selected list of columns (row key included implicitly) for rows matching with provided filter
public <T extends KVPersistable> java.util.List<java.util.Map<java.lang.String,java.lang.Object>> query(java.lang.String table, java.lang.Class<T> entityClass, org.apache.hadoop.hbase.filter.Filter filter, java.lang.String... columns)- HBASE Connection is thread safe and is a very heavy object. It's recommended to use a single connection through out the application.
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