BsoBird commented on code in PR #9546:
URL: https://github.com/apache/iceberg/pull/9546#discussion_r1528109766
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core/src/main/java/org/apache/iceberg/hadoop/HadoopTableOperations.java:
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@@ -149,26 +183,71 @@ public void commit(TableMetadata base, TableMetadata
metadata) {
String codecName =
metadata.property(
TableProperties.METADATA_COMPRESSION,
TableProperties.METADATA_COMPRESSION_DEFAULT);
+ // TODO:This is not compatible with the scenario where the user modifies
the metadata file
+ // compression codec arbitrarily.
+ // We can inform the user about this bug first, and fix it later.(Do not
modify the compressed
+ // format after the table is created.)
TableMetadataParser.Codec codec =
TableMetadataParser.Codec.fromName(codecName);
String fileExtension = TableMetadataParser.getFileExtension(codec);
- Path tempMetadataFile = metadataPath(UUID.randomUUID().toString() +
fileExtension);
+ Path tempMetadataFile = metadataPath(UUID.randomUUID() + fileExtension);
TableMetadataParser.write(metadata,
io().newOutputFile(tempMetadataFile.toString()));
int nextVersion = (current.first() != null ? current.first() : 0) + 1;
Path finalMetadataFile = metadataFilePath(nextVersion, codec);
FileSystem fs = getFileSystem(tempMetadataFile, conf);
-
- // this rename operation is the atomic commit operation
- renameToFinal(fs, tempMetadataFile, finalMetadataFile, nextVersion);
-
- LOG.info("Committed a new metadata file {}", finalMetadataFile);
-
- // update the best-effort version pointer
- writeVersionHint(nextVersion);
-
- deleteRemovedMetadataFiles(base, metadata);
-
- this.shouldRefresh = true;
+ boolean versionCommitSuccess = false;
+ try {
+ deleteOldVersionHint(fs, versionHintFile(), nextVersion);
+ versionCommitSuccess = commitNewVersion(fs, tempMetadataFile,
finalMetadataFile, nextVersion);
+ if (!versionCommitSuccess) {
+ // Users should clean up orphaned files after job fail.
+ // This may be too heavy. But it can stay that way for now.
+ String msg =
+ String.format(
+ "Can not write versionHint. commitVersion = %s.Is there a
problem with the file system?",
+ nextVersion);
+ throw new RuntimeException(msg);
+ } else {
+ this.shouldRefresh = versionCommitSuccess;
+ // In fact, we don't really care if the metadata cleanup/update
succeeds or not,
+ // if it fails this time, we can execute it in the next commit method
call.
+ // So we should fix the shouldRefresh flag first.
+ if (this.firstRun) {
+ this.firstRun = false;
+ }
+ LOG.info("Committed a new metadata file {}", finalMetadataFile);
+ // update the best-effort version pointer
+ boolean writeVersionHintSuccess = writeVersionHint(fs, nextVersion);
+ if (!writeVersionHintSuccess) {
+ LOG.warn(
+ "Failed to write a new versionHintFile,commit version is [{}],
is there a problem with the file system?",
+ nextVersion);
+ }
+ deleteRemovedMetadataFiles(base, metadata);
+ }
+ } catch (CommitStateUnknownException | CommitFailedException e) {
Review Comment:
@nastra Currently, we throw a CommitStateUnknownException to circumvent file
cleanup. We could also tweak it. But, I guess that's another topic.
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