Github user eribeiro commented on a diff in the pull request: https://github.com/apache/zookeeper/pull/120#discussion_r95721046 --- Diff: src/java/main/org/apache/zookeeper/server/persistence/FileTxnSnapLog.java --- @@ -175,11 +193,20 @@ public long restore(DataTree dt, Map<Long, Integer> sessions, "No snapshot found, but there are log entries. " + "Something is broken!"); } - /* TODO: (br33d) we should either put a ConcurrentHashMap on restore() - * or use Map on save() */ - save(dt, (ConcurrentHashMap<Long, Integer>)sessions); - /* return a zxid of zero, since we the database is empty */ - return 0; + + if (suspectEmptyDB) { + /* return a zxid of -1, since we are possibly missing data */ + LOG.warn("Unexpected empty data tree, setting zxid to -1"); --- End diff -- Are we 100% sure the data tree is empty? Couldn't it be only partially complete? I mean the machine recorded up to transaction n, but lost transactions n+1, n+2, n+3, etc?
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