C++ NamespaceDetails::getCompletedIndexCount方法代码示例

    /**
     * For a given query, get a runner.  The runner could be a SingleSolutionRunner, a
     * CachedQueryRunner, or a MultiPlanRunner, depending on the cache/query solver/etc.
     */
    Status getRunner(CanonicalQuery* rawCanonicalQuery, Runner** out) {
        verify(rawCanonicalQuery);
        auto_ptr<CanonicalQuery> canonicalQuery(rawCanonicalQuery);

        // Try to look up a cached solution for the query.
        // TODO: Can the cache have negative data about a solution?
        PlanCache* localCache = PlanCache::get(canonicalQuery->ns());
        if (NULL != localCache) {
            CachedSolution* cs = localCache->get(*canonicalQuery);
            if (NULL != cs) {
                // We have a cached solution.  Hand the canonical query and cached solution off to
                // the cached plan runner, which takes ownership of both.
                WorkingSet* ws;
                PlanStage* root;
                verify(StageBuilder::build(*cs->solution, &root, &ws));
                *out = new CachedPlanRunner(canonicalQuery.release(), cs, root, ws);
                return Status::OK();
            }
        }

        // No entry in cache for the query.  We have to solve the query ourself.

        // Get the indices that we could possibly use.
        NamespaceDetails* nsd = nsdetails(canonicalQuery->ns().c_str());

        // If this is NULL, there is no data but the query is valid.  You're allowed to query for
        // data on an empty collection and it's not an error.  There just isn't any data...
        if (NULL == nsd) {
            const std::string& ns = canonicalQuery->ns();
            *out = new EOFRunner(canonicalQuery.release(), ns);
            return Status::OK();
        }

        // Tailable: If the query requests tailable the collection must be capped.
        if (canonicalQuery->getParsed().hasOption(QueryOption_CursorTailable)) {
            if (!nsd->isCapped()) {
                return Status(ErrorCodes::BadValue,
                              "tailable cursor requested on non capped collection");
            }

            // If a sort is specified it must be equal to expectedSort.
            const BSONObj expectedSort = BSON("$natural" << 1);
            const BSONObj& actualSort = canonicalQuery->getParsed().getSort();
            if (!actualSort.isEmpty() && !(actualSort == expectedSort)) {
                return Status(ErrorCodes::BadValue,
                              "invalid sort specified for tailable cursor: "
                              + actualSort.toString());
            }
        }

        // If it's not NULL, we may have indices.
        vector<IndexEntry> indices;
        for (int i = 0; i < nsd->getCompletedIndexCount(); ++i) {
            auto_ptr<IndexDescriptor> desc(CatalogHack::getDescriptor(nsd, i));
            indices.push_back(IndexEntry(desc->keyPattern(), desc->isMultikey(), desc->isSparse(), desc->indexName()));
        }

        vector<QuerySolution*> solutions;
        size_t options = QueryPlanner::DEFAULT;
        if (storageGlobalParams.noTableScan) {
            const string& ns = canonicalQuery->ns();
            // There are certain cases where we ignore this restriction:
            bool ignore = canonicalQuery->getQueryObj().isEmpty()
                          || (string::npos != ns.find(".system."))
                          || (0 == ns.find("local."));
            if (!ignore) {
                options |= QueryPlanner::NO_TABLE_SCAN;
            }
        }
        else {
            options |= QueryPlanner::INCLUDE_COLLSCAN;
        }
        QueryPlanner::plan(*canonicalQuery, indices, options, &solutions);

        /*
        for (size_t i = 0; i < solutions.size(); ++i) {
            QLOG() << "solution " << i << " is " << solutions[i]->toString() << endl;
        }
        */

        // We cannot figure out how to answer the query.  Should this ever happen?
        if (0 == solutions.size()) {
            return Status(ErrorCodes::BadValue, "Can't create a plan for the canonical query " +
                                                 canonicalQuery->toString());
        }

        if (1 == solutions.size()) {
            // Only one possible plan.  Run it.  Build the stages from the solution.
            WorkingSet* ws;
            PlanStage* root;
            verify(StageBuilder::build(*solutions[0], &root, &ws));

            // And, run the plan.
            *out = new SingleSolutionRunner(canonicalQuery.release(), solutions[0], root, ws);
            return Status::OK();
        }
//.........这里部分代码省略.........

//.........这里部分代码省略.........
                int ndel = 0;
                long long delSize = 0;
                BSONArrayBuilder delBucketSizes;
                int incorrect = 0;
                for ( int i = 0; i < Buckets; i++ ) {
                    DiskLoc loc = nsd->deletedListEntry(i);
                    try {
                        int k = 0;
                        while ( !loc.isNull() ) {
                            if ( recs.count(loc) )
                                incorrect++;
                            ndel++;

                            if ( loc.questionable() ) {
                                if( nsd->isCapped() && !loc.isValid() && i == 1 ) {
                                    /* the constructor for NamespaceDetails intentionally sets deletedList[1] to invalid
                                       see comments in namespace.h
                                    */
                                    break;
                                }

                                string err( str::stream() << "bad pointer in deleted record list: "
                                                          << loc.toString()
                                                          << " bucket: " << i
                                                          << " k: " << k );
                                errors << err;
                                valid = false;
                                break;
                            }

                            DeletedRecord *d = loc.drec();
                            delSize += d->lengthWithHeaders();
                            loc = d->nextDeleted();
                            k++;
                            killCurrentOp.checkForInterrupt();
                        }
                        delBucketSizes << k;
                    }
                    catch (...) {
                        errors << ("exception in deleted chain for bucket " + BSONObjBuilder::numStr(i));
                        valid = false;
                    }
                }
                result.appendNumber("deletedCount", ndel);
                result.appendNumber("deletedSize", delSize);
                if ( full ) {
                    result << "delBucketSizes" << delBucketSizes.arr();
                }

                if ( incorrect ) {
                    errors << (BSONObjBuilder::numStr(incorrect) + " records from datafile are in deleted list");
                    valid = false;
                }

                int idxn = 0;
                try  {
                    IndexCatalog* indexCatalog = collection->getIndexCatalog();

                    result.append("nIndexes", nsd->getCompletedIndexCount());
                    BSONObjBuilder indexes; // not using subObjStart to be exception safe
                    NamespaceDetails::IndexIterator i = nsd->ii();
                    while( i.more() ) {
                        IndexDetails& id = i.next();
                        log() << "validating index " << idxn << ": " << id.indexNamespace() << endl;

                        IndexDescriptor* descriptor = indexCatalog->getDescriptor( idxn );
                        verify( descriptor );
                        IndexAccessMethod* iam = indexCatalog->getIndex( descriptor );
                        verify( iam );

                        int64_t keys;
                        iam->validate(&keys);
                        indexes.appendNumber(id.indexNamespace(), static_cast<long long>(keys));
                        idxn++;
                    }
                    result.append("keysPerIndex", indexes.done());
                }
                catch (...) {
                    errors << ("exception during index validate idxn " + BSONObjBuilder::numStr(idxn));
                    valid=false;
                }

            }
            catch (AssertionException) {
                errors << "exception during validate";
                valid = false;
            }

            result.appendBool("valid", valid);
            result.append("errors", errors.arr());

            if ( !full ){
                result.append("warning", "Some checks omitted for speed. use {full:true} option to do more thorough scan.");
            }
            
            if ( !valid ) {
                result.append("advice", "ns corrupt, requires repair");
            }

        }