private String toDebugString(long state) {
    return "0x" + Integer.toHexString(System.identityHashCode(this)) + "("
        + State.getArena(state) + ":" + State.getHeader(state) + "; " + allocSize + "; "
        + State.toFlagString(State.getAllFlags(state)) + ")";
  }
Marks this buffer as eligible for proactive eviction. No need to check refCount here.
@return buffer size
llap-server/src/java/org/apache/hadoop/hive/llap/cache/LlapAllocatorBuffer.java