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Minor cleanup in the InternalEngine (#29241) 

Fix a couple of minor things in the InternalEngine:

* Rename loadOrGenerateHistoryUUID to reflect that it always generates a UUID 

* Move .acquire() call next to the associated try {} block.
This commit is contained in:
David Turner 2018-04-02 10:07:28 +01:00 committed by GitHub
parent 40d19532bc
commit 3be960d1c2
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1 changed files with 6 additions and 6 deletions
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12
server/src/main/java/org/elasticsearch/index/engine/InternalEngine.java
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@ -184,8 +184,7 @@ public class InternalEngine extends Engine {
new CombinedDeletionPolicy(logger, translogDeletionPolicy, translog::getLastSyncedGlobalCheckpoint);
writer = createWriter();
bootstrapAppendOnlyInfoFromWriter(writer);
historyUUID = loadOrGenerateHistoryUUID(writer);
Objects.requireNonNull(historyUUID, "history uuid should not be null");
historyUUID = loadHistoryUUID(writer);
indexWriter = writer;
} catch (IOException | TranslogCorruptedException e) {
throw new EngineCreationFailureException(shardId, "failed to create engine", e);
@ -275,10 +274,11 @@ public class InternalEngine extends Engine {
// steal it by calling incRef on the "stolen" reader
internalSearcherManager.maybeRefreshBlocking();
IndexSearcher acquire = internalSearcherManager.acquire();
final IndexReader previousReader = referenceToRefresh.getIndexReader();
assert previousReader instanceof ElasticsearchDirectoryReader:
"searcher's IndexReader should be an ElasticsearchDirectoryReader, but got " + previousReader;
try {
final IndexReader previousReader = referenceToRefresh.getIndexReader();
assert previousReader instanceof ElasticsearchDirectoryReader:
"searcher's IndexReader should be an ElasticsearchDirectoryReader, but got " + previousReader;
final IndexReader newReader = acquire.getIndexReader();
if (newReader == previousReader) {
// nothing has changed - both ref managers share the same instance so we can use reference equality
@ -473,7 +473,7 @@ public class InternalEngine extends Engine {
/**
* Reads the current stored history ID from the IW commit data.
*/
private String loadOrGenerateHistoryUUID(final IndexWriter writer) throws IOException {
private String loadHistoryUUID(final IndexWriter writer) throws IOException {
final String uuid = commitDataAsMap(writer).get(HISTORY_UUID_KEY);
if (uuid == null) {
throw new IllegalStateException("commit doesn't contain history uuid");