klsince commented on a change in pull request #7969:
URL: https://github.com/apache/pinot/pull/7969#discussion_r778332657
##########
File path:
pinot-core/src/main/java/org/apache/pinot/core/data/manager/BaseTableDataManager.java
##########
@@ -275,53 +278,23 @@ public void addSegmentError(String segmentName,
SegmentErrorInfo segmentErrorInf
@Override
public void reloadSegment(String segmentName, IndexLoadingConfig
indexLoadingConfig, SegmentZKMetadata zkMetadata,
- SegmentMetadata localMetadata, @Nullable Schema schema, boolean
forceDownload)
+ SegmentMetadata segmentMetadata, @Nullable Schema schema, boolean
forceDownload)
throws Exception {
- File indexDir = localMetadata.getIndexDir();
- Preconditions.checkState(indexDir.isDirectory(), "Index directory: %s is
not a directory", indexDir);
-
- File parentFile = indexDir.getParentFile();
- File segmentBackupDir =
- new File(parentFile, indexDir.getName() +
CommonConstants.Segment.SEGMENT_BACKUP_DIR_SUFFIX);
-
+ File indexDir = getSegmentDataDir(segmentName);
+ // Create backup dir to make segment reloading atomic for local tier
backend.
+ LoaderUtils.createBackup(indexDir);
try {
- // First rename index directory to segment backup directory so that
original segment have all file descriptors
- // point to the segment backup directory to ensure original segment
serves queries properly
-
- // Rename index directory to segment backup directory (atomic)
- Preconditions.checkState(indexDir.renameTo(segmentBackupDir),
- "Failed to rename index directory: %s to segment backup directory:
%s", indexDir, segmentBackupDir);
-
- // Download from remote or copy from local backup directory into index
directory,
- // and then continue to load the segment from index directory.
- boolean shouldDownload = forceDownload || !hasSameCRC(zkMetadata,
localMetadata);
- if (shouldDownload && allowDownload(segmentName, zkMetadata)) {
- if (forceDownload) {
- LOGGER.info("Segment: {} of table: {} is forced to download",
segmentName, _tableNameWithType);
- } else {
- LOGGER.info("Download segment:{} of table: {} as local crc: {}
mismatches remote crc: {}", segmentName,
- _tableNameWithType, localMetadata.getCrc(), zkMetadata.getCrc());
- }
- indexDir = downloadSegment(segmentName, zkMetadata);
+ boolean shouldDownloadRawSegment = forceDownload ||
!hasSameCRC(zkMetadata, segmentMetadata);
+ if (shouldDownloadRawSegment && allowDownloadRawSegment(segmentName,
zkMetadata)) {
+ downloadRawSegmentAndProcess(segmentName, indexLoadingConfig,
zkMetadata, schema);
Review comment:
A server's `tier backend` is not peer server or deep store.
The refactoring in this PR would allow a server's tier backend to be local
disk (the default impl) or remote fs (like s3). The segment from server's tier
backend is not the raw segment from deep store or peer server, but the fully
preprocessed segment ready to serve queries or to apply incremental changes
like adding index.
When server uses remote tier backend, the `File indexDir` does not exist for
the backup/restore flow, so I added the existence check at L166 ^
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