} catch (final IOException e) {
                logger.warn("Failed to migrate thumbnail images.", e);
            }
        }, "ThumbnailMigrator").start();
    }

    public void setThumbnailPathCacheSize(final int thumbnailPathCacheSize) {
        this.thumbnailPathCacheSize = thumbnailPathCacheSize;
    }

    public void setImageExtention(final String imageExtention) {