org.apache.hadoop.hbase.client.Query Maven / Gradle / Ivy
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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.client;
import java.util.Map;
import com.google.common.collect.Maps;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.exceptions.DeserializationException;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.io.TimeRange;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.security.access.AccessControlConstants;
import org.apache.hadoop.hbase.security.access.Permission;
import org.apache.hadoop.hbase.security.visibility.Authorizations;
import org.apache.hadoop.hbase.security.visibility.VisibilityConstants;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;
import org.apache.hadoop.hbase.util.Bytes;
@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract class Query extends OperationWithAttributes {
private static final String ISOLATION_LEVEL = "_isolationlevel_";
protected Filter filter = null;
protected int targetReplicaId = -1;
protected Consistency consistency = Consistency.STRONG;
protected Map colFamTimeRangeMap = Maps.newTreeMap(Bytes.BYTES_COMPARATOR);
protected Boolean loadColumnFamiliesOnDemand = null;
/**
* @return Filter
*/
public Filter getFilter() {
return filter;
}
/**
* Apply the specified server-side filter when performing the Query.
* Only {@link Filter#filterKeyValue(Cell)} is called AFTER all tests
* for ttl, column match, deletes and max versions have been run.
* @param filter filter to run on the server
* @return this for invocation chaining
*/
public Query setFilter(Filter filter) {
this.filter = filter;
return this;
}
/**
* Sets the authorizations to be used by this Query
* @param authorizations
*/
public Query setAuthorizations(Authorizations authorizations) {
this.setAttribute(VisibilityConstants.VISIBILITY_LABELS_ATTR_KEY, ProtobufUtil
.toAuthorizations(authorizations).toByteArray());
return this;
}
/**
* @return The authorizations this Query is associated with.
* @throws DeserializationException
*/
public Authorizations getAuthorizations() throws DeserializationException {
byte[] authorizationsBytes = this.getAttribute(VisibilityConstants.VISIBILITY_LABELS_ATTR_KEY);
if (authorizationsBytes == null) return null;
return ProtobufUtil.toAuthorizations(authorizationsBytes);
}
/**
* @return The serialized ACL for this operation, or null if none
*/
public byte[] getACL() {
return getAttribute(AccessControlConstants.OP_ATTRIBUTE_ACL);
}
/**
* @param user User short name
* @param perms Permissions for the user
*/
public Query setACL(String user, Permission perms) {
setAttribute(AccessControlConstants.OP_ATTRIBUTE_ACL,
ProtobufUtil.toUsersAndPermissions(user, perms).toByteArray());
return this;
}
/**
* @param perms A map of permissions for a user or users
*/
public Query setACL(Map perms) {
ListMultimap permMap = ArrayListMultimap.create();
for (Map.Entry entry : perms.entrySet()) {
permMap.put(entry.getKey(), entry.getValue());
}
setAttribute(AccessControlConstants.OP_ATTRIBUTE_ACL,
ProtobufUtil.toUsersAndPermissions(permMap).toByteArray());
return this;
}
/**
* Returns the consistency level for this operation
* @return the consistency level
*/
public Consistency getConsistency() {
return consistency;
}
/**
* Sets the consistency level for this operation
* @param consistency the consistency level
*/
public Query setConsistency(Consistency consistency) {
this.consistency = consistency;
return this;
}
/**
* Specify region replica id where Query will fetch data from. Use this together with
* {@link #setConsistency(Consistency)} passing {@link Consistency#TIMELINE} to read data from
* a specific replicaId.
*
Expert: This is an advanced API exposed. Only use it if you know what you are doing
* @param Id
*/
public Query setReplicaId(int Id) {
this.targetReplicaId = Id;
return this;
}
/**
* Returns region replica id where Query will fetch data from.
* @return region replica id or -1 if not set.
*/
public int getReplicaId() {
return this.targetReplicaId;
}
/**
* Set the isolation level for this query. If the
* isolation level is set to READ_UNCOMMITTED, then
* this query will return data from committed and
* uncommitted transactions. If the isolation level
* is set to READ_COMMITTED, then this query will return
* data from committed transactions only. If a isolation
* level is not explicitly set on a Query, then it
* is assumed to be READ_COMMITTED.
* @param level IsolationLevel for this query
*/
public Query setIsolationLevel(IsolationLevel level) {
setAttribute(ISOLATION_LEVEL, level.toBytes());
return this;
}
/**
* @return The isolation level of this query.
* If no isolation level was set for this query object,
* then it returns READ_COMMITTED.
* @return The IsolationLevel for this query
*/
public IsolationLevel getIsolationLevel() {
byte[] attr = getAttribute(ISOLATION_LEVEL);
return attr == null ? IsolationLevel.READ_COMMITTED :
IsolationLevel.fromBytes(attr);
}
/**
* Set the value indicating whether loading CFs on demand should be allowed (cluster
* default is false). On-demand CF loading doesn't load column families until necessary, e.g.
* if you filter on one column, the other column family data will be loaded only for the rows
* that are included in result, not all rows like in normal case.
* With column-specific filters, like SingleColumnValueFilter w/filterIfMissing == true,
* this can deliver huge perf gains when there's a cf with lots of data; however, it can
* also lead to some inconsistent results, as follows:
* - if someone does a concurrent update to both column families in question you may get a row
* that never existed, e.g. for { rowKey = 5, { cat_videos => 1 }, { video => "my cat" } }
* someone puts rowKey 5 with { cat_videos => 0 }, { video => "my dog" }, concurrent scan
* filtering on "cat_videos == 1" can get { rowKey = 5, { cat_videos => 1 },
* { video => "my dog" } }.
* - if there's a concurrent split and you have more than 2 column families, some rows may be
* missing some column families.
*/
public Query setLoadColumnFamiliesOnDemand(boolean value) {
this.loadColumnFamiliesOnDemand = value;
return this;
}
/**
* Get the raw loadColumnFamiliesOnDemand setting; if it's not set, can be null.
*/
public Boolean getLoadColumnFamiliesOnDemandValue() {
return this.loadColumnFamiliesOnDemand;
}
/**
* Get the logical value indicating whether on-demand CF loading should be allowed.
*/
public boolean doLoadColumnFamiliesOnDemand() {
return (this.loadColumnFamiliesOnDemand != null) && this.loadColumnFamiliesOnDemand;
}
/**
* Get versions of columns only within the specified timestamp range,
* [minStamp, maxStamp) on a per CF bases. Note, default maximum versions to return is 1. If
* your time range spans more than one version and you want all versions
* returned, up the number of versions beyond the default.
* Column Family time ranges take precedence over the global time range.
*
* @param cf the column family for which you want to restrict
* @param minStamp minimum timestamp value, inclusive
* @param maxStamp maximum timestamp value, exclusive
* @return this
*/
public Query setColumnFamilyTimeRange(byte[] cf, long minStamp, long maxStamp) {
colFamTimeRangeMap.put(cf, new TimeRange(minStamp, maxStamp));
return this;
}
/**
* @return Map a map of column families to time ranges
*/
public Map getColumnFamilyTimeRange() {
return this.colFamTimeRangeMap;
}
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