229 lines
9.6 KiB
C++
229 lines
9.6 KiB
C++
/*
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* KeyRangeMap.actor.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "fdbclient/KeyRangeMap.h"
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#include "fdbclient/NativeAPI.actor.h"
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#include "fdbclient/CommitTransaction.h"
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#include "fdbclient/FDBTypes.h"
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#include "fdbclient/ReadYourWrites.h"
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#include "flow/actorcompiler.h" // has to be last include
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void KeyRangeActorMap::getRangesAffectedByInsertion( const KeyRangeRef& keys, vector< KeyRange >& affectedRanges ) {
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auto s = map.rangeContaining( keys.begin );
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if (s.begin() != keys.begin && s.value().isValid() && !s.value().isReady())
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affectedRanges.push_back( KeyRangeRef( s.begin(), keys.begin ) );
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affectedRanges.push_back( keys );
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auto e = map.rangeContaining( keys.end );
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if (e.begin() != keys.end && e.value().isValid() && !e.value().isReady())
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affectedRanges.push_back( KeyRangeRef( keys.end, e.end() ) );
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}
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Standalone<RangeResultRef> krmDecodeRanges(
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KeyRef mapPrefix,
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KeyRange keys,
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Standalone<RangeResultRef> kv )
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{
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ASSERT(!kv.more || kv.size() > 1);
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KeyRange withPrefix = KeyRangeRef( mapPrefix.toString() + keys.begin.toString(), mapPrefix.toString() + keys.end.toString() );
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ValueRef beginValue, endValue;
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if (kv.size() && kv[0].key.startsWith(mapPrefix))
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beginValue = kv[0].value;
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if (kv.size() && kv.end()[-1].key.startsWith(mapPrefix))
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endValue = kv.end()[-1].value;
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Standalone<RangeResultRef> result;
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result.arena().dependsOn( kv.arena() );
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result.arena().dependsOn( keys.arena() );
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result.push_back(result.arena(), KeyValueRef(keys.begin, beginValue));
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for(int i=0; i<kv.size(); i++) {
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if (kv[i].key > withPrefix.begin && kv[i].key < withPrefix.end) {
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KeyRef k = kv[i].key.removePrefix(mapPrefix);
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result.push_back(result.arena(), KeyValueRef( k, kv[i].value ));
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}
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else if(kv[i].key >= withPrefix.end)
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kv.more = false;
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}
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if(!kv.more)
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result.push_back(result.arena(), KeyValueRef(keys.end, endValue));
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result.more = kv.more;
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return result;
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}
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// Returns keys.begin, all transitional points in keys, and keys.end, and their values
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ACTOR Future<Standalone<RangeResultRef>> krmGetRanges( Transaction* tr, Key mapPrefix, KeyRange keys, int limit, int limitBytes )
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{
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KeyRange withPrefix = KeyRangeRef( mapPrefix.toString() + keys.begin.toString(), mapPrefix.toString() + keys.end.toString() );
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state GetRangeLimits limits(limit, limitBytes);
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limits.minRows = 2;
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Standalone<RangeResultRef> kv = wait( tr->getRange( lastLessOrEqual(withPrefix.begin), firstGreaterThan(withPrefix.end), limits ) );
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return krmDecodeRanges( mapPrefix, keys, kv );
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}
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ACTOR Future<Standalone<RangeResultRef>> krmGetRanges( Reference<ReadYourWritesTransaction> tr, Key mapPrefix, KeyRange keys, int limit, int limitBytes )
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{
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KeyRange withPrefix = KeyRangeRef( mapPrefix.toString() + keys.begin.toString(), mapPrefix.toString() + keys.end.toString() );
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state GetRangeLimits limits(limit, limitBytes);
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limits.minRows = 2;
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Standalone<RangeResultRef> kv = wait( tr->getRange( lastLessOrEqual(withPrefix.begin), firstGreaterThan(withPrefix.end), limits ) );
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return krmDecodeRanges( mapPrefix, keys, kv );
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}
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void krmSetPreviouslyEmptyRange( Transaction* tr, const KeyRef& mapPrefix, const KeyRangeRef& keys, const ValueRef& newValue, const ValueRef& oldEndValue )
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{
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KeyRange withPrefix = KeyRangeRef( mapPrefix.toString() + keys.begin.toString(), mapPrefix.toString() + keys.end.toString() );
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tr->set( withPrefix.begin, newValue );
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tr->set( withPrefix.end, oldEndValue );
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}
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void krmSetPreviouslyEmptyRange( CommitTransactionRef& tr, Arena& trArena, const KeyRef& mapPrefix, const KeyRangeRef& keys, const ValueRef& newValue, const ValueRef& oldEndValue )
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{
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KeyRange withPrefix = KeyRangeRef( mapPrefix.toString() + keys.begin.toString(), mapPrefix.toString() + keys.end.toString() );
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tr.set( trArena, withPrefix.begin, newValue );
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tr.set( trArena, withPrefix.end, oldEndValue );
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}
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ACTOR Future<Void> krmSetRange( Transaction* tr, Key mapPrefix, KeyRange range, Value value ) {
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state KeyRange withPrefix = KeyRangeRef( mapPrefix.toString() + range.begin.toString(), mapPrefix.toString() + range.end.toString() );
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Standalone<RangeResultRef> old = wait(tr->getRange(lastLessOrEqual(withPrefix.end), firstGreaterThan(withPrefix.end), 1, true));
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Value oldValue;
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bool hasResult = old.size() > 0 && old[0].key.startsWith(mapPrefix);
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if(hasResult)
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oldValue = old[0].value;
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KeyRange conflictRange = KeyRangeRef( hasResult ? old[0].key : mapPrefix.toString(), keyAfter(withPrefix.end) );
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if( !conflictRange.empty() )
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tr->addReadConflictRange( conflictRange );
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tr->clear(withPrefix);
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tr->set( withPrefix.begin, value );
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tr->set( withPrefix.end, oldValue );
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return Void();
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}
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ACTOR Future<Void> krmSetRange( Reference<ReadYourWritesTransaction> tr, Key mapPrefix, KeyRange range, Value value ) {
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state KeyRange withPrefix = KeyRangeRef( mapPrefix.toString() + range.begin.toString(), mapPrefix.toString() + range.end.toString() );
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Standalone<RangeResultRef> old = wait(tr->getRange(lastLessOrEqual(withPrefix.end), firstGreaterThan(withPrefix.end), 1, true));
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Value oldValue;
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bool hasResult = old.size() > 0 && old[0].key.startsWith(mapPrefix);
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if(hasResult)
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oldValue = old[0].value;
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KeyRange conflictRange = KeyRangeRef( hasResult ? old[0].key : mapPrefix.toString(), keyAfter(withPrefix.end) );
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if( !conflictRange.empty() )
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tr->addReadConflictRange( conflictRange );
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tr->clear(withPrefix);
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tr->set( withPrefix.begin, value );
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tr->set( withPrefix.end, oldValue );
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return Void();
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}
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//Sets a range of keys in a key range map, coalescing with adjacent regions if the values match
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//Ranges outside of maxRange will not be coalesced
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//CAUTION: use care when attempting to coalesce multiple ranges in the same prefix in a single transaction
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ACTOR template <class Transaction>
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static Future<Void> krmSetRangeCoalescing_(Transaction* tr, Key mapPrefix, KeyRange range, KeyRange maxRange,
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Value value) {
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ASSERT(maxRange.contains(range));
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state KeyRange withPrefix = KeyRangeRef( mapPrefix.toString() + range.begin.toString(), mapPrefix.toString() + range.end.toString() );
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state KeyRange maxWithPrefix = KeyRangeRef( mapPrefix.toString() + maxRange.begin.toString(), mapPrefix.toString() + maxRange.end.toString() );
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state vector<Future<Standalone<RangeResultRef>>> keys;
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keys.push_back(tr->getRange(lastLessThan(withPrefix.begin), firstGreaterOrEqual(withPrefix.begin), 1, true));
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keys.push_back(tr->getRange(lastLessOrEqual(withPrefix.end), firstGreaterThan(withPrefix.end) + 1, 2, true));
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wait(waitForAll(keys));
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//Determine how far to extend this range at the beginning
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auto beginRange = keys[0].get();
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bool hasBegin = beginRange.size() > 0 && beginRange[0].key.startsWith(mapPrefix);
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Value beginValue = hasBegin ? beginRange[0].value : LiteralStringRef("");
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state Key beginKey = withPrefix.begin;
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if(beginValue == value) {
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bool outsideRange = !hasBegin || beginRange[0].key < maxWithPrefix.begin;
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beginKey = outsideRange ? maxWithPrefix.begin : beginRange[0].key;
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}
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//Determine how far to extend this range at the end
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auto endRange = keys[1].get();
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bool hasEnd = endRange.size() >= 1 && endRange[0].key.startsWith(mapPrefix) && endRange[0].key <= withPrefix.end;
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bool hasNext = (endRange.size() == 2 && endRange[1].key.startsWith(mapPrefix)) || (endRange.size() == 1 && withPrefix.end < endRange[0].key && endRange[0].key.startsWith(mapPrefix));
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Value existingValue = hasEnd ? endRange[0].value : LiteralStringRef("");
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bool valueMatches = value == existingValue;
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KeyRange conflictRange = KeyRangeRef( hasBegin ? beginRange[0].key : mapPrefix, withPrefix.begin );
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if( !conflictRange.empty() )
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tr->addReadConflictRange( conflictRange );
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conflictRange = KeyRangeRef( hasEnd ? endRange[0].key : mapPrefix, hasNext ? keyAfter(endRange.end()[-1].key) : strinc( mapPrefix ) );
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if( !conflictRange.empty() )
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tr->addReadConflictRange( conflictRange );
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state Key endKey;
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state Value endValue;
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//Case 1: Coalesce completely with the following range
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if(hasNext && endRange.end()[-1].key <= maxWithPrefix.end && valueMatches) {
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endKey = endRange.end()[-1].key;
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endValue = endRange.end()[-1].value;
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}
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//Case 2: Coalesce with the following range only up to the end of maxRange
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else if(valueMatches) {
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endKey = maxWithPrefix.end;
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endValue = existingValue;
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}
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//Case 3: Don't coalesce
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else {
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endKey = withPrefix.end;
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endValue = existingValue;
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}
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tr->clear(KeyRangeRef(beginKey, endKey));
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ASSERT(value != endValue || endKey == maxWithPrefix.end);
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tr->set(beginKey, value);
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tr->set(endKey, endValue);
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return Void();
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}
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Future<Void> krmSetRangeCoalescing(Transaction* const& tr, Key const& mapPrefix, KeyRange const& range,
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KeyRange const& maxRange, Value const& value) {
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return krmSetRangeCoalescing_(tr, mapPrefix, range, maxRange, value);
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}
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Future<Void> krmSetRangeCoalescing(Reference<ReadYourWritesTransaction> const& tr, Key const& mapPrefix,
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KeyRange const& range, KeyRange const& maxRange, Value const& value) {
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return holdWhile(tr, krmSetRangeCoalescing_(tr.getPtr(), mapPrefix, range, maxRange, value));
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}
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