int capacity = memberCnt * 2;
File objectStoreDir = new File(TEST_OUTPUT_DIR, "object_store");
DataStore<byte[], byte[]> dataStore = getDataStore(objectStoreDir, capacity);
SerializableObjectStore<String, MemberProtos.Member> memberStore =
new SerializableObjectStore<String, MemberProtos.Member>(dataStore, new KeySerializer(), new MemberSerializer());
MemberProtos.MemberBook book = MemberDataGen.generateMemberBook(memberCnt);
for (MemberProtos.Member m : book.getMemberList()) {
memberStore.put(m.getEmail(0), m);