bgaborg commented on a change in pull request #1229: HADOOP-16490. Improve
S3Guard handling of FNFEs in copy
URL: https://github.com/apache/hadoop/pull/1229#discussion_r313423481
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File path:
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java
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@@ -3177,10 +3212,29 @@ private CopyResult copyFile(String srcKey, String
dstKey, long size,
String action = "copyFile(" + srcKey + ", " + dstKey + ")";
Invoker readInvoker = readContext.getReadInvoker();
- ObjectMetadata srcom =
- once(action, srcKey,
- () ->
- getObjectMetadata(srcKey, changeTracker, readInvoker, "copy"));
+ ObjectMetadata srcom;
+ try {
+ srcom = once(action, srcKey,
+ () ->
+ getObjectMetadata(srcKey, changeTracker, readInvoker, "copy"));
+ } catch (FileNotFoundException e) {
+ // if rename fails at this point it means that the expected file was not
+ // found.
+ // The cause is believed to always be one of
+ // - File has been deleted since LIST/S3Guard list knew of it.
+ // - S3Guard is asking for a specific version and it's been removed by
+ // lifecycle rules.
+ // - there's a 404 cached in S3 load balancers
+ // We create an exception, but the text depends on the S3Guard state
+ String message = hasMetadataStore()
Review comment:
good idea to have detailed debug here!
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