rahulgoswami commented on code in PR #3903: URL: https://github.com/apache/solr/pull/3903#discussion_r2678415514
########## solr/core/src/java/org/apache/solr/handler/admin/api/UpgradeCoreIndex.java: ########## @@ -0,0 +1,450 @@ +/* + * 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.solr.handler.admin.api; + +import java.io.IOException; +import java.lang.invoke.MethodHandles; +import java.nio.file.Path; +import java.util.List; +import java.util.Set; +import org.apache.lucene.document.Document; +import org.apache.lucene.index.DirectoryReader; +import org.apache.lucene.index.FilterLeafReader; +import org.apache.lucene.index.IndexReader; +import org.apache.lucene.index.IndexWriter; +import org.apache.lucene.index.IndexableField; +import org.apache.lucene.index.LeafReader; +import org.apache.lucene.index.LeafReaderContext; +import org.apache.lucene.index.MergePolicy; +import org.apache.lucene.index.SegmentCommitInfo; +import org.apache.lucene.index.SegmentReader; +import org.apache.lucene.index.StoredFields; +import org.apache.lucene.store.FSDirectory; +import org.apache.lucene.util.Bits; +import org.apache.lucene.util.Version; +import org.apache.solr.client.api.model.UpgradeCoreIndexRequestBody; +import org.apache.solr.client.api.model.UpgradeCoreIndexResponse; +import org.apache.solr.common.SolrException; +import org.apache.solr.common.SolrInputDocument; +import org.apache.solr.common.params.ModifiableSolrParams; +import org.apache.solr.common.params.UpdateParams; +import org.apache.solr.common.util.NamedList; +import org.apache.solr.core.CoreContainer; +import org.apache.solr.core.SolrCore; +import org.apache.solr.handler.RequestHandlerBase; +import org.apache.solr.handler.admin.CoreAdminHandler; +import org.apache.solr.index.LatestVersionMergePolicy; +import org.apache.solr.request.LocalSolrQueryRequest; +import org.apache.solr.request.SolrQueryRequest; +import org.apache.solr.request.SolrRequestHandler; +import org.apache.solr.response.SolrQueryResponse; +import org.apache.solr.schema.IndexSchema; +import org.apache.solr.schema.SchemaField; +import org.apache.solr.search.DocValuesIteratorCache; +import org.apache.solr.search.SolrDocumentFetcher; +import org.apache.solr.search.SolrIndexSearcher; +import org.apache.solr.update.AddUpdateCommand; +import org.apache.solr.update.CommitUpdateCommand; +import org.apache.solr.update.processor.UpdateRequestProcessor; +import org.apache.solr.update.processor.UpdateRequestProcessorChain; +import org.apache.solr.util.RefCounted; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class UpgradeCoreIndex extends CoreAdminAPIBase { + private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); + + public enum CoreIndexUpgradeStatus { + UPGRADE_SUCCESSFUL, + ERROR, + NO_UPGRADE_NEEDED; + } + + private static final int RETRY_COUNT_FOR_SEGMENT_DELETION = 5; + + public UpgradeCoreIndex( + CoreContainer coreContainer, + CoreAdminHandler.CoreAdminAsyncTracker coreAdminAsyncTracker, + SolrQueryRequest req, + SolrQueryResponse rsp) { + super(coreContainer, coreAdminAsyncTracker, req, rsp); + } + + @Override + public boolean isExpensive() { + return true; + } + + public UpgradeCoreIndexResponse upgradeCoreIndex( + String coreName, UpgradeCoreIndexRequestBody requestBody) throws Exception { + ensureRequiredParameterProvided("coreName", coreName); + + final UpgradeCoreIndexResponse response = + instantiateJerseyResponse(UpgradeCoreIndexResponse.class); + + return handlePotentiallyAsynchronousTask( + response, + coreName, + requestBody.async, + "upgrade-index", + () -> { + try (SolrCore core = coreContainer.getCore(coreName)) { + + log.info("Received UPGRADECOREINDEX request for core: {}", coreName); + + // Set LatestVersionMergePolicy to prevent older segments from + // participating in merges while we reindex. This is to prevent any older version + // segments from + // merging with any newly formed segments created due to reindexing and undoing the work + // we are doing. + RefCounted<IndexWriter> iwRef = null; + MergePolicy originalMergePolicy = null; + int numSegmentsEligibleForUpgrade = 0, numSegmentsUpgraded = 0; + try { + iwRef = core.getSolrCoreState().getIndexWriter(core); + if (iwRef != null) { + IndexWriter iw = iwRef.get(); + if (iw != null) { + originalMergePolicy = iw.getConfig().getMergePolicy(); + iw.getConfig() + .setMergePolicy( + new LatestVersionMergePolicy(iw.getConfig().getMergePolicy())); + } + } + + RefCounted<SolrIndexSearcher> ssearcherRef = core.getSearcher(); + try { + List<LeafReaderContext> leafContexts = + ssearcherRef.get().getTopReaderContext().leaves(); + DocValuesIteratorCache dvICache = new DocValuesIteratorCache(ssearcherRef.get()); + + UpdateRequestProcessorChain updateProcessorChain = + getUpdateProcessorChain(core, requestBody.updateChain); + + for (LeafReaderContext lrc : leafContexts) { + if (shouldUpgradeSegment(lrc)) { + numSegmentsEligibleForUpgrade++; + } + } + if (numSegmentsEligibleForUpgrade == 0) { + response.core = coreName; + response.upgradeStatus = CoreIndexUpgradeStatus.NO_UPGRADE_NEEDED.toString(); + response.numSegmentsEligibleForUpgrade = 0; + return response; + } + + for (LeafReaderContext lrc : leafContexts) { + if (!shouldUpgradeSegment(lrc)) { + continue; + } + processSegment(lrc, updateProcessorChain, core, ssearcherRef.get(), dvICache); + numSegmentsUpgraded++; + } + } catch (Exception e) { + log.error("Error while processing core: [{}}]", coreName, e); + throw new CoreAdminAPIBaseException(e); + } finally { + // important to decrement searcher ref count after use since we obtained it via the + // SolrCore.getSearcher() method + ssearcherRef.decref(); + } + + try { + doCommit(core); + } catch (IOException e) { + throw new CoreAdminAPIBaseException(e); + } + + boolean indexUpgraded = isIndexUpgraded(core); + + if (!indexUpgraded) { + log.error( + "Validation failed for core '{}'. Some data is still present in the older (<{}.x) Lucene index format.", + coreName, + Version.LATEST.major); + throw new CoreAdminAPIBaseException( + new SolrException( + SolrException.ErrorCode.SERVER_ERROR, + "Validation failed for core '" + + coreName + + "'. Some data is still present in the older (<" + + Version.LATEST.major + + ".x) Lucene index format.")); + } + + response.core = coreName; + response.upgradeStatus = CoreIndexUpgradeStatus.UPGRADE_SUCCESSFUL.toString(); + response.numSegmentsEligibleForUpgrade = numSegmentsEligibleForUpgrade; + response.numSegmentsUpgraded = numSegmentsUpgraded; + } catch (Exception ioEx) { + throw new CoreAdminAPIBaseException(ioEx); + + } finally { + // Restore original merge policy + if (iwRef != null) { + IndexWriter iw = iwRef.get(); + if (iw != null && originalMergePolicy != null) { Review Comment: iwRef null-check might be needed in case there is an exception getting the IndexWriter in try for whatever reason. Removed the null check on "iw". -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
