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When updating a Ferret search index document, reuse existing rows where possible
Summary: Ref T13587. Currently, when a document is reindexed by Ferret, the old document is completely discarded and a new version is inserted to replace it. This approach is simple to implement, but can lead to exhaustion of the ngram AUTO_INCREMENT id column in reasonable circumstances. Conceptually, this approach "should" be fine and this exhaustion is an awkard implementation detail. However, since it's easy to be less wasteful when performing document updates and all the other approaches are awkward or leaky in other ways that are probably worse, use a more complex implementation to avoid executing unnecessary INSERT statements. Test Plan: - Created and indexed a new document, searched for it. - Updated a document, indexed it with `bin/search index ... --force --trace`, saw only modifications updated in the index. - Searched for newly added terms (got hits) and removed terms (no longer got hits) to verify add/delete index behavior. Maniphest Tasks: T13587 Differential Revision: https://secure.phabricator.com/D21495
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1 changed files with 261 additions and 87 deletions
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@ -134,123 +134,297 @@ final class PhabricatorFerretFulltextEngineExtension
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$ngram_engine = new PhabricatorSearchNgramEngine();
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$ngrams = $ngram_engine->getTermNgramsFromString($ngrams_source);
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$conn = $object->establishConnection('w');
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if ($ngrams) {
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$common = queryfx_all(
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$conn,
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'SELECT ngram FROM %T WHERE ngram IN (%Ls)',
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$engine->getCommonNgramsTableName(),
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$ngrams);
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$common = ipull($common, 'ngram', 'ngram');
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foreach ($ngrams as $key => $ngram) {
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if (isset($common[$ngram])) {
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unset($ngrams[$key]);
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continue;
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}
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// NOTE: MySQL discards trailing whitespace in CHAR(X) columns.
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$trimmed_ngram = rtrim($ngram, ' ');
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if (isset($common[$trimmed_ngram])) {
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unset($ngrams[$key]);
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continue;
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}
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}
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}
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$object->openTransaction();
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try {
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$conn = $object->establishConnection('w');
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$this->deleteOldDocument($engine, $object, $document);
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// See T13587. If this document already exists in the index, we try to
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// update the existing rows to avoid leaving the ngrams table heavily
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// fragmented.
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queryfx(
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$old_document = queryfx_one(
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$conn,
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'INSERT INTO %T (objectPHID, isClosed, epochCreated, epochModified,
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authorPHID, ownerPHID) VALUES (%s, %d, %d, %d, %ns, %ns)',
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'SELECT id FROM %T WHERE objectPHID = %s',
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$engine->getDocumentTableName(),
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$object->getPHID(),
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$is_closed,
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$document->getDocumentCreated(),
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$document->getDocumentModified(),
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$author_phid,
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$owner_phid);
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$object->getPHID());
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if ($old_document) {
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$old_document_id = (int)$old_document['id'];
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} else {
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$old_document_id = null;
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}
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$document_id = $conn->getInsertID();
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foreach ($ferret_fields as $ferret_field) {
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if ($old_document_id === null) {
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queryfx(
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$conn,
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'INSERT INTO %T (documentID, fieldKey, rawCorpus, termCorpus,
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normalCorpus) VALUES (%d, %s, %s, %s, %s)',
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$engine->getFieldTableName(),
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$document_id,
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$ferret_field['fieldKey'],
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$ferret_field['rawCorpus'],
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$ferret_field['termCorpus'],
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$ferret_field['normalCorpus']);
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}
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'INSERT INTO %T (objectPHID, isClosed, epochCreated, epochModified,
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authorPHID, ownerPHID) VALUES (%s, %d, %d, %d, %ns, %ns)',
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$engine->getDocumentTableName(),
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$object->getPHID(),
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$is_closed,
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$document->getDocumentCreated(),
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$document->getDocumentModified(),
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$author_phid,
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$owner_phid);
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$document_id = $conn->getInsertID();
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if ($ngrams) {
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$common = queryfx_all(
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$is_new = true;
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} else {
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$document_id = $old_document_id;
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queryfx(
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$conn,
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'SELECT ngram FROM %T WHERE ngram IN (%Ls)',
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$engine->getCommonNgramsTableName(),
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$ngrams);
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$common = ipull($common, 'ngram', 'ngram');
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'UPDATE %T
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SET
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isClosed = %d,
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epochCreated = %d,
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epochModified = %d,
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authorPHID = %ns,
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ownerPHID = %ns
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WHERE id = %d',
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$engine->getDocumentTableName(),
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$is_closed,
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$document->getDocumentCreated(),
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$document->getDocumentModified(),
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$author_phid,
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$owner_phid,
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$document_id);
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foreach ($ngrams as $key => $ngram) {
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if (isset($common[$ngram])) {
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unset($ngrams[$key]);
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continue;
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}
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// NOTE: MySQL discards trailing whitespace in CHAR(X) columns.
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$trim_ngram = rtrim($ngram, ' ');
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if (isset($common[$ngram])) {
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unset($ngrams[$key]);
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continue;
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}
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}
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$is_new = false;
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}
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if ($ngrams) {
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$sql = array();
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foreach ($ngrams as $ngram) {
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$sql[] = qsprintf(
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$conn,
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'(%d, %s)',
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$document_id,
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$ngram);
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}
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$this->updateStoredFields(
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$conn,
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$is_new,
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$document_id,
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$engine,
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$ferret_fields);
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$this->updateStoredNgrams(
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$conn,
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$is_new,
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$document_id,
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$engine,
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$ngrams);
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foreach (PhabricatorLiskDAO::chunkSQL($sql) as $chunk) {
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queryfx(
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$conn,
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'INSERT INTO %T (documentID, ngram) VALUES %LQ',
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$engine->getNgramsTableName(),
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$chunk);
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}
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}
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} catch (Exception $ex) {
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$object->killTransaction();
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throw $ex;
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} catch (Throwable $ex) {
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$object->killTransaction();
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throw $ex;
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}
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$object->saveTransaction();
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}
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private function deleteOldDocument(
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private function updateStoredFields(
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AphrontDatabaseConnection $conn,
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$is_new,
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$document_id,
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PhabricatorFerretEngine $engine,
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$object,
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PhabricatorSearchAbstractDocument $document) {
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$new_fields) {
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$conn = $object->establishConnection('w');
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$old_document = queryfx_one(
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$conn,
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'SELECT * FROM %T WHERE objectPHID = %s',
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$engine->getDocumentTableName(),
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$object->getPHID());
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if (!$old_document) {
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return;
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if (!$is_new) {
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$old_fields = queryfx_all(
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$conn,
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'SELECT * FROM %T WHERE documentID = %d',
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$engine->getFieldTableName(),
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$document_id);
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} else {
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$old_fields = array();
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}
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$old_id = $old_document['id'];
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$old_fields = ipull($old_fields, null, 'fieldKey');
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$new_fields = ipull($new_fields, null, 'fieldKey');
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queryfx(
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$conn,
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'DELETE FROM %T WHERE id = %d',
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$engine->getDocumentTableName(),
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$old_id);
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$delete_rows = array();
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$insert_rows = array();
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$update_rows = array();
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queryfx(
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$conn,
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'DELETE FROM %T WHERE documentID = %d',
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$engine->getFieldTableName(),
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$old_id);
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foreach ($old_fields as $field_key => $old_field) {
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if (!isset($new_fields[$field_key])) {
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$delete_rows[] = $old_field;
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}
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}
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queryfx(
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$conn,
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'DELETE FROM %T WHERE documentID = %d',
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$engine->getNgramsTableName(),
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$old_id);
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$compare_keys = array(
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'rawCorpus',
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'termCorpus',
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'normalCorpus',
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);
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foreach ($new_fields as $field_key => $new_field) {
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if (!isset($old_fields[$field_key])) {
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$insert_rows[] = $new_field;
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continue;
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}
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$old_field = $old_fields[$field_key];
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$same_row = true;
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foreach ($compare_keys as $compare_key) {
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if ($old_field[$compare_key] !== $new_field[$compare_key]) {
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$same_row = false;
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break;
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}
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}
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if ($same_row) {
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continue;
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}
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$new_field['id'] = $old_field['id'];
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$update_rows[] = $new_field;
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}
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if ($delete_rows) {
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queryfx(
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$conn,
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'DELETE FROM %T WHERE id IN (%Ld)',
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$engine->getFieldTableName(),
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ipull($delete_rows, 'id'));
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}
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foreach ($update_rows as $update_row) {
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queryfx(
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$conn,
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'UPDATE %T
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SET
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rawCorpus = %s,
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termCorpus = %s,
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normalCorpus = %s
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WHERE id = %d',
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$engine->getFieldTableName(),
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$update_row['rawCorpus'],
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$update_row['termCorpus'],
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$update_row['normalCorpus'],
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$update_row['id']);
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}
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foreach ($insert_rows as $insert_row) {
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queryfx(
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$conn,
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'INSERT INTO %T (documentID, fieldKey, rawCorpus, termCorpus,
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normalCorpus) VALUES (%d, %s, %s, %s, %s)',
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$engine->getFieldTableName(),
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$document_id,
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$insert_row['fieldKey'],
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$insert_row['rawCorpus'],
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$insert_row['termCorpus'],
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$insert_row['normalCorpus']);
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}
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}
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private function updateStoredNgrams(
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AphrontDatabaseConnection $conn,
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$is_new,
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$document_id,
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PhabricatorFerretEngine $engine,
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$new_ngrams) {
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if ($is_new) {
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$old_ngrams = array();
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} else {
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$old_ngrams = queryfx_all(
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$conn,
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'SELECT id, ngram FROM %T WHERE documentID = %d',
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$engine->getNgramsTableName(),
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$document_id);
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}
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$old_ngrams = ipull($old_ngrams, 'id', 'ngram');
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$new_ngrams = array_fuse($new_ngrams);
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$delete_ids = array();
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$insert_ngrams = array();
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// NOTE: MySQL discards trailing whitespace in CHAR(X) columns.
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foreach ($old_ngrams as $ngram => $id) {
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if (isset($new_ngrams[$ngram])) {
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continue;
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}
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$untrimmed_ngram = $ngram.' ';
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if (isset($new_ngrams[$untrimmed_ngram])) {
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continue;
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}
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$delete_ids[] = $id;
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}
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foreach ($new_ngrams as $ngram) {
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if (isset($old_ngrams[$ngram])) {
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continue;
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}
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$trimmed_ngram = rtrim($ngram, ' ');
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if (isset($old_ngrams[$trimmed_ngram])) {
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continue;
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}
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$insert_ngrams[] = $ngram;
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}
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if ($delete_ids) {
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$sql = array();
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foreach ($delete_ids as $id) {
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$sql[] = qsprintf(
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$conn,
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'%d',
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$id);
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}
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foreach (PhabricatorLiskDAO::chunkSQL($sql) as $chunk) {
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queryfx(
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$conn,
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'DELETE FROM %T WHERE id IN (%LQ)',
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$engine->getNgramsTableName(),
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$chunk);
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}
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}
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if ($insert_ngrams) {
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$sql = array();
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foreach ($insert_ngrams as $ngram) {
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$sql[] = qsprintf(
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$conn,
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'(%d, %s)',
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$document_id,
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$ngram);
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}
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foreach (PhabricatorLiskDAO::chunkSQL($sql) as $chunk) {
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queryfx(
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$conn,
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'INSERT INTO %T (documentID, ngram) VALUES %LQ',
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$engine->getNgramsTableName(),
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$chunk);
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}
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}
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}
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public function newFerretSearchFunctions() {
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