VirtualBox中的Neo4j服务器:无法创建rrd存储 [英] Neo4j server in VirtualBox: Unable to create rrd store

问题描述

我正在尝试在运行Ubuntu的Virtualbox内运行 Neo4j服务器. 服务器文件和数据库位于我的Windows主机中，并通过共享文件夹(vboxsf)访问. 不幸的是，我无法轻松地将数据传输到虚拟机中并直接在虚拟机中运行(由于虚拟磁盘上的可用空间不足.我试图对其进行扩展，但没有成功.)

I'm trying to run a Neo4j server inside my Virtualbox which is running Ubuntu. The server files and the database are located within my Windows-Host and accessed via a shared folder (vboxsf). Unfortunately I can not easily transfer the data into the virtual machine and run it there directly (due to insufficient free space on the virtual disk. I tried to enlarge it but that didn't work out.)

该数据库已由我的队友建立并使用.现在，我想访问系统上准备好的数据. (顺便说一句，我是neo4j的完整新手)我的总体设置(VM而不是本机系统)有些不同，我们无法确定实际问题是什么.

The database was set up and used by my teammate. Now I want to access the prepared data on my system. (btw, I'm a complete newbie to neo4j) My overall setup (VM instead of a native system) is a bit different and we couldn't figure out, what the actual problem is.

当我尝试通过控制台启动服务器时，得到以下信息:

When I try to start the server via the console, I get this:

don@VirtualHAL:~/Data/SharedFolder/DBs/neo4j-community-1.9$ bin/neo4j start
WARNING! You are using an unsupported Java runtime. Please use Oracle(R) Java(TM) Runtime Environment 7.
Starting Neo4j Server...WARNING: not changing user
process [7248]... waiting for server to be ready.............. Failed to start within 120 seconds.
Neo4j Server may have failed to start, please check the logs.

有关Java版本的警告可能是由于我安装了Java OpenJDK 7而引起的.(我的队友使用了该版本，没有任何其他问题).

The warning about the java version is propably caused by the fact that I installed Java OpenJDK 7. (My teammate uses the same, without any further problems).

实际上并不需要2分钟，直到显示"120秒内无法启动"消息.

It does not actually take 2 minutes until the 'Failed to start within 120 seconds' message appears.

当然，我检查了日志:

8/21/13 8:37:12 PM org.neo4j.server.modules.RESTApiModule INFO: Mounted REST API at [/db/data/]
8/21/13 8:37:12 PM org.neo4j.server.modules.ManagementApiModule INFO: Mounted management API at [/db/manage/]
8/21/d13 8:37:12 PM org.neo4j.server.rrd.RrdFactory SEVERE: Unable to open rrd store, attempting to recreate it**
8/21/13 8:37:12 PM org.neo4j.server.rrd.RrdFactory SEVERE: current RRDB is invalid, renamed it to /home/don/Data/SharedFolder/DBs/neo4j-community-1.9/data/rrd-invalid-1377110232712
8/21/13 8:37:12 PM org.neo4j.server.rrd.RrdFactory SEVERE: Unable to create new rrd store
8/21/13 8:37:12 PM org.neo4j.server.CommunityBootstrapper SEVERE: 
java.lang.RuntimeException: java.io.IOException: Invalid argument
    at org.neo4j.server.rrd.RrdFactory.createRrdb(RrdFactory.java:176)
    at org.neo4j.server.rrd.RrdFactory.recreateArchive(RrdFactory.java:204)
    at org.neo4j.server.rrd.RrdFactory.createRrdb(RrdFactory.java:159)

这是日志的(看似)相关部分. Unable to create new rrd store-这可能是什么原因? 到目前为止，搜索错误消息的任何部分都没有给我任何新信息.

This is the (seemingly) relevant part of the log. Unable to create new rrd store - What could be the cause for this? Searching for any parts of the error message didn't get me any new information so far.

推荐答案

也适用于此. Neo4j对RRD使用外部库-rrd4j.如果您查看它的源代码，就会发现它使用了内存映射文件.

Ran into this as well. Neo4j uses an external lib for RRDs - rrd4j. If you look at the source code for it, you'll see that it uses a memory mapped file.

https://github.com/fusesource/rrd4j/blob/rrd4j-2.0.7/src/main/java/org/rrd4j/core/RrdNioBackend.java

我在此联机上找不到任何内容，但我猜想用于挂载共享文件夹的Virtualbox来宾添加项不支持内存映射.我不认为这是操作系统，而是内核实现.我很想知道是否是这种情况.我的C-fu不强壮，但如果可能的话，我真的很想支持.

I can't find anything on this online, but I'm guessing that the Guest Additions for Virtualbox for mounting shared folders doesn't support memory mapping. I don't think it's an OS thing, but a kernel implementation thing. I'd love to find out if that's the case. My C-fu is not strong, but I'd really like to support this if at all possible.

是的，这是客人加法.这张票: https://www.virtualbox.org/ticket/819 -已经7岁了.从2周前开始，OSX上就在进行此活动.

Yep, it's Guest Additions. This ticket: https://www.virtualbox.org/ticket/819 - is 7 years old. There's activity on it for OSX from 2 weeks ago.

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