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Don't check if directory is present to prevent races 

We do check if a directory is present and then open a dir stream on
it. Yet the file can be concurrrently deleted which is OK but we fail
with a hard exception. This change tries to open the dir directly (listing via stream)
and catches NoSuchFileEx | FNFEx.
This commit is contained in:
Simon Willnauer 2015-08-21 21:44:54 +02:00
parent 907f648a88
commit 846cf620db
1 changed files with 6 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
core/src/main/java/org/elasticsearch/gateway/MetaDataStateFormat.java
View File

@ -43,12 +43,10 @@ import org.elasticsearch.common.xcontent.XContentHelper;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.nio.file.*;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
@ -253,10 +251,9 @@ public abstract class MetaDataStateFormat<T> {
if (dataLocations != null) { // select all eligable files first
for (Path dataLocation : dataLocations) {
final Path stateDir = dataLocation.resolve(STATE_DIR_NAME);
if (!Files.isDirectory(stateDir)) {
continue;
}
// now, iterate over the current versions, and find latest one
// we don't check if the stateDir is present since it could be deleted
// after the check. Also if there is a _state file and it's not a dir something is really wrong
try (DirectoryStream<Path> paths = Files.newDirectoryStream(stateDir)) { // we don't pass a glob since we need the group part for parsing
for (Path stateFile : paths) {
final Matcher matcher = stateFilePattern.matcher(stateFile.getFileName().toString());
@ -270,6 +267,8 @@ public abstract class MetaDataStateFormat<T> {
files.add(pav);
}
}
} catch (NoSuchFileException | FileNotFoundException ex) {
// no _state directory -- move on
}
}
}