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Make FsBlobContainer Listing Resilient to Concurrent Modifications (#49142) (#49176) 

* Make FsBlobContainer Listing Resilient to Concurrent Modifications

If we list out files in a folder via the lazily computed directory
stream, we have to deal with concurrent deletes when reading the file
attributes since we don't have a lock on the directory in any way.

Closes #37581
This commit is contained in:
Armin Braun 2019-11-15 21:14:53 +01:00 committed by GitHub
parent 57f57227ac
commit 2886d4c6dd
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1 changed files with 7 additions and 1 deletions
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8
server/src/main/java/org/elasticsearch/common/blobstore/fs/FsBlobContainer.java
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@ -97,7 +97,13 @@ public class FsBlobContainer extends AbstractBlobContainer {
blobNamePrefix = blobNamePrefix == null ? "" : blobNamePrefix;
try (DirectoryStream<Path> stream = Files.newDirectoryStream(path, blobNamePrefix + "*")) {
for (Path file : stream) {
final BasicFileAttributes attrs = Files.readAttributes(file, BasicFileAttributes.class);
final BasicFileAttributes attrs;
try {
attrs = Files.readAttributes(file, BasicFileAttributes.class);
} catch (FileNotFoundException | NoSuchFileException e) {
// The file was concurrently deleted between listing files and trying to get its attributes so we skip it here
continue;
}
if (attrs.isRegularFile()) {
builder.put(file.getFileName().toString(), new PlainBlobMetaData(file.getFileName().toString(), attrs.size()));
}