private String getKeySizes() {
        final StringBuilder sb = new StringBuilder();
        final AtomicLong size = new AtomicLong();
        keyMap.forEach((k, v) -> {
            sb.append("\t");
            sb.append(k);
            sb.append(" = ");
            sb.append(v.size());
            sb.append("\n");
            size.getAndAdd(v.size());
        });
        sb.append("total = ");
        sb.append(size.get());

        return sb.toString();
    }
Forces the eviction of all pooled items associated with this key

@param key The key of the entry to evict.
stroom-pipeline/src/main/java/stroom/pipeline/cache/AbstractPoolCache.java