Github user ahgittin commented on a diff in the pull request:
https://github.com/apache/incubator-brooklyn/pull/61#discussion_r14806843
--- Diff: utils/common/src/main/java/brooklyn/util/os/Os.java ---
@@ -544,13 +545,23 @@ public static File newTempFile(Class<?> clazz, String
ext) {
/** creates a temp dir which will be deleted on exit */
public static File newTempDir(String prefix) {
- String baseName = (prefix==null ? "" : prefix + "-") +
Identifiers.makeRandomId(4);
- File tempDir = new File(tmp(), baseName);
- if (tempDir.mkdir()) {
- Os.deleteOnExitRecursively(tempDir);
- return tempDir;
+ String sanitizedPrefix = (prefix==null ? "" : prefix + "-");
+ String tmpParent = tmp();
+ for (int i = 0; i < TEMP_DIR_ATTEMPTS; i++) {
+ String baseName = sanitizedPrefix +
Identifiers.makeRandomId(4);
+ File tempDir = new File(tmpParent, baseName);
+ if (!tempDir.exists()) {
+ if (tempDir.mkdir()) {
+ Os.deleteOnExitRecursively(tempDir);
+ return tempDir;
+ } else {
+ log.warn("Attempt to create temp dir failed " +
tempDir);
+ }
+ } else {
+ log.debug("Attemp to create temp dir failed, already
exists " + tempDir);
--- End diff --
have worked through the math. it's the old "how many people in a room
until there's a better than even chance two have the same birthday" problem.
suggest the comment on the `debug` explain this, that with random id of length
4 it's not unusual to have duplicates at the 2000 members mark.
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