vinothchandar commented on a change in pull request #2494:
URL: https://github.com/apache/hudi/pull/2494#discussion_r584393784
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File path:
hudi-common/src/main/java/org/apache/hudi/metadata/HoodieBackedTableMetadata.java
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@@ -112,13 +113,59 @@ private void initIfNeeded() {
@Override
protected Option<HoodieRecord<HoodieMetadataPayload>>
getRecordByKeyFromMetadata(String key) {
+ // This function can be called in parallel through multiple threads. For
each thread, we determine the thread-local
+ // versions of the baseFile and logRecord readers to use.
+ // - If reuse is enabled, we use the same readers and dont close them
+ // - if reuse is disabled, we open new readers in each thread and close
them
+ HoodieFileReader localFileReader = null;
+ HoodieMetadataMergedLogRecordScanner localLogRecordScanner = null;
+ synchronized (this) {
+ if (!metadataConfig.enableReuse()) {
+ // reuse is disabled so always open new readers
+ try {
+ Pair<HoodieFileReader, HoodieMetadataMergedLogRecordScanner> readers
= openReaders();
+ localFileReader = readers.getKey();
+ localLogRecordScanner = readers.getValue();
+ } catch (IOException e) {
+ throw new HoodieIOException("Error opening readers", e);
+ }
+ } else if (baseFileReader == null && logRecordScanner == null) {
+ // reuse is enabled but we haven't opened the readers yet
+ try {
+ Pair<HoodieFileReader, HoodieMetadataMergedLogRecordScanner> readers
= openReaders();
+ localFileReader = readers.getKey();
+ localLogRecordScanner = readers.getValue();
+ // cache the readers
+ baseFileReader = localFileReader;
+ logRecordScanner = localLogRecordScanner;
+ } catch (IOException e) {
+ throw new HoodieIOException("Error opening readers", e);
+ }
+ } else {
+ // reuse the already open readers
+ ValidationUtils.checkState((baseFileReader != null || logRecordScanner
!= null), "Readers should already be open");
+ localFileReader = baseFileReader;
+ localLogRecordScanner = logRecordScanner;
+ }
+ }
Review comment:
@prashantwason and I already synced on this. Will be catching up on
reviews.
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