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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.hive.ql.parse;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import org.apache.hadoop.hive.ql.metadata.Partition;
import org.apache.hadoop.hive.ql.metadata.Table;
import org.apache.hadoop.hive.ql.plan.PlanUtils;
import javax.annotation.Nullable;
import java.text.Collator;
import java.util.Map;
/**
* Statements executed to handle replication have some additional
* information relevant to the replication subsystem - this class
* captures those bits of information.
*
* Typically, this corresponds to the replicationClause definition
* in the parser.
*/
public class ReplicationSpec {
private boolean isInReplicationScope = false; // default is that it's not in a repl scope
private boolean isMetadataOnly = false; // default is full export/import, not metadata-only
private String eventId = null;
private String currStateId = null;
private boolean isNoop = false;
// Key definitions related to replication
public enum KEY {
REPL_SCOPE("repl.scope"),
EVENT_ID("repl.event.id"),
CURR_STATE_ID("repl.last.id"),
NOOP("repl.noop");
private final String keyName;
KEY(String s) {
this.keyName = s;
}
@Override
public String toString(){
return keyName;
}
}
public enum SCOPE { NO_REPL, MD_ONLY, REPL };
static private Collator collator = Collator.getInstance();
/**
* Constructor to construct spec based on either the ASTNode that
* corresponds to the replication clause itself, or corresponds to
* the parent node, and will scan through the children to instantiate
* itself.
* @param node replicationClause node, or parent of replicationClause node
*/
public ReplicationSpec(ASTNode node){
if (node != null){
if (isApplicable(node)){
init(node);
return;
} else {
for (int i = 1; i < node.getChildCount(); ++i) {
ASTNode child = (ASTNode) node.getChild(i);
if (isApplicable(child)) {
init(child);
return;
}
}
}
}
// If we reached here, we did not find a replication
// spec in the node or its immediate children. Defaults
// are to pretend replication is not happening, and the
// statement above is running as-is.
}
/**
* Default ctor that is useful for determining default states
*/
public ReplicationSpec(){
this((ASTNode)null);
}
public ReplicationSpec(
boolean isInReplicationScope, boolean isMetadataOnly, String eventReplicationState,
String currentReplicationState, boolean isNoop){
this.isInReplicationScope = isInReplicationScope;
this.isMetadataOnly = isMetadataOnly;
this.eventId = eventReplicationState;
this.currStateId = currentReplicationState;
this.isNoop = isNoop;
}
public ReplicationSpec(Function keyFetcher) {
String scope = keyFetcher.apply(ReplicationSpec.KEY.REPL_SCOPE.toString());
this.isMetadataOnly = false;
this.isInReplicationScope = false;
if (scope != null){
if (scope.equalsIgnoreCase("metadata")){
this.isMetadataOnly = true;
this.isInReplicationScope = true;
} else if (scope.equalsIgnoreCase("all")){
this.isInReplicationScope = true;
}
}
this.eventId = keyFetcher.apply(ReplicationSpec.KEY.EVENT_ID.toString());
this.currStateId = keyFetcher.apply(ReplicationSpec.KEY.CURR_STATE_ID.toString());
this.isNoop = Boolean.parseBoolean(
keyFetcher.apply(ReplicationSpec.KEY.NOOP.toString()));
}
/**
* Tests if an ASTNode is a Replication Specification
*/
public static boolean isApplicable(ASTNode node){
return (node.getToken().getType() == HiveParser.TOK_REPLICATION);
}
/**
* @param currReplState Current object state
* @param replacementReplState Replacement-candidate state
* @return whether or not a provided replacement candidate is newer(or equal) to the existing object state or not
*/
public static boolean allowReplacement(String currReplState, String replacementReplState){
if ((currReplState == null) || (currReplState.isEmpty())) {
// if we have no replication state on record for the obj, allow replacement.
return true;
}
if ((replacementReplState == null) || (replacementReplState.isEmpty())) {
// if we reached this condition, we had replication state on record for the
// object, but its replacement has no state. Disallow replacement
return false;
}
// First try to extract a long value from the strings, and compare them.
// If oldReplState is less-than or equal to newReplState, allow.
long currReplStateLong = Long.parseLong(currReplState.replaceAll("\\D",""));
long replacementReplStateLong = Long.parseLong(replacementReplState.replaceAll("\\D",""));
if ((currReplStateLong != 0) || (replacementReplStateLong != 0)){
return ((currReplStateLong - replacementReplStateLong) <= 0);
}
// If the long value of both is 0, though, fall back to lexical comparison.
// Lexical comparison according to locale will suffice for now, future might add more logic
return (collator.compare(currReplState.toLowerCase(), replacementReplState.toLowerCase()) <= 0);
}
/**
* Determines if a current replication object(current state of dump) is allowed to
* replicate-replace-into a given partition
*/
public boolean allowReplacementInto(Partition ptn){
return allowReplacement(getLastReplicatedStateFromParameters(ptn.getParameters()),this.getCurrentReplicationState());
}
/**
* Determines if a current replication event specification is allowed to
* replicate-replace-into a given partition
*/
public boolean allowEventReplacementInto(Partition ptn){
return allowReplacement(getLastReplicatedStateFromParameters(ptn.getParameters()),this.getReplicationState());
}
/**
* Determines if a current replication object(current state of dump) is allowed to
* replicate-replace-into a given table
*/
public boolean allowReplacementInto(Table table) {
return allowReplacement(getLastReplicatedStateFromParameters(table.getParameters()),this.getCurrentReplicationState());
}
/**
* Determines if a current replication event specification is allowed to
* replicate-replace-into a given table
*/
public boolean allowEventReplacementInto(Table table) {
return allowReplacement(getLastReplicatedStateFromParameters(table.getParameters()),this.getReplicationState());
}
/**
* Returns a predicate filter to filter an Iterable to return all partitions
* that the current replication event specification is allowed to replicate-replace-into
*/
public Predicate allowEventReplacementInto() {
return new Predicate() {
@Override
public boolean apply(@Nullable Partition partition) {
if (partition == null){
return false;
}
return (allowEventReplacementInto(partition));
}
};
}
private static String getLastReplicatedStateFromParameters(Map m) {
if ((m != null) && (m.containsKey(KEY.CURR_STATE_ID.toString()))){
return m.get(KEY.CURR_STATE_ID.toString());
}
return null;
}
private void init(ASTNode node){
// -> ^(TOK_REPLICATION $replId $isMetadataOnly)
isInReplicationScope = true;
eventId = PlanUtils.stripQuotes(node.getChild(0).getText());
if (node.getChildCount() > 1){
if (node.getChild(1).getText().toLowerCase().equals("metadata")) {
isMetadataOnly= true;
}
}
}
/**
* @return true if this statement is being run for the purposes of replication
*/
public boolean isInReplicationScope(){
return isInReplicationScope;
}
/**
* @return true if this statement refers to metadata-only operation.
*/
public boolean isMetadataOnly(){
return isMetadataOnly;
}
/**
* @return the replication state of the event that spawned this statement
*/
public String getReplicationState() {
return eventId;
}
/**
* @return the current replication state of the wh
*/
public String getCurrentReplicationState() {
return currStateId;
}
public void setCurrentReplicationState(String currStateId) {
this.currStateId = currStateId;
}
/**
* @return whether or not the current replication action should be a noop
*/
public boolean isNoop() {
return isNoop;
}
/**
* @param isNoop whether or not the current replication action should be a noop
*/
public void setNoop(boolean isNoop) {
this.isNoop = isNoop;
}
public String get(KEY key) {
switch (key){
case REPL_SCOPE:
switch (getScope()){
case MD_ONLY:
return "metadata";
case REPL:
return "all";
case NO_REPL:
return "none";
}
case EVENT_ID:
return getReplicationState();
case CURR_STATE_ID:
return getCurrentReplicationState();
case NOOP:
return String.valueOf(isNoop());
}
return null;
}
public SCOPE getScope(){
if (isInReplicationScope()){
if (isMetadataOnly()){
return SCOPE.MD_ONLY;
} else {
return SCOPE.REPL;
}
} else {
return SCOPE.NO_REPL;
}
}
}
