Question

尽管我的环境变量正确，但是我无法使用'cassandra -f'启动cassandra。我正在使用Windows 10计算机。

我遇到以下错误！

PS C:\WINDOWS\system32> cassandra -f

*---------------------------------------------------------------------* *---------------------------------------------------------------------* WARNING! Automatic page file configuration detected. It is recommended that you disable swap when running Cassandra for performance and stability reasons. *---------------------------------------------------------------------* *---------------------------------------------------------------------* Exception calling "Start" with "0" argument(s): "The system cannot find the file specified" At C:\cassandra\conf\cassandra-env.ps1:212 char:5 + $p.Start() | Out-Null + ~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : Win32Exception Exception calling "WaitForExit" with "0" argument(s): "No process is associated with this object." At C:\cassandra\conf\cassandra-env.ps1:213 char:5 + $p.WaitForExit() + ~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : InvalidOperationException You cannot call a method on a null-valued expression. At C:\cassandra\conf\cassandra-env.ps1:214 char:5 + $stderr = $p.StandardError.ReadToEnd() + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull You cannot call a method on a null-valued expression. At C:\cassandra\conf\cassandra-env.ps1:218 char:9 + if ($stderr.Contains("Error")) + ~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull You cannot call a method on a null-valued expression. At C:\cassandra\conf\cassandra-env.ps1:231 char:5 + $sa = $stderr.Split("""") + ~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull Cannot index into a null array. At C:\cassandra\conf\cassandra-env.ps1:232 char:5 + $env:JVM_VERSION = $sa[1] + ~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : NullArray You cannot call a method on a null-valued expression. At C:\cassandra\conf\cassandra-env.ps1:234 char:9 + if ($stderr.Contains("OpenJDK")) + ~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull Cannot index into a null array. At C:\cassandra\conf\cassandra-env.ps1:247 char:5 + $pa = $sa[1].Split("_") + ~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : NullArray Cannot index into a null array. At C:\cassandra\conf\cassandra-env.ps1:248 char:5 + $subVersion = $pa[1] + ~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : NullArray *---------------------------------------------------------------------* *---------------------------------------------------------------------* WARNING! Detected a power profile other than High Performance. Performance of this node will suffer. Modify conf\cassandra.env.ps1 to suppress this warning. *---------------------------------------------------------------------* *---------------------------------------------------------------------* You cannot call a method on a null-valued expression. At C:\cassandra\conf\cassandra-env.ps1:406 char:9 + if ($env:JVM_VERSION.CompareTo("1.8.0") -eq -1 -or [convert]::ToI ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull Exception calling "Start" with "0" argument(s): "The system cannot find the file specified" At C:\cassandra\bin\cassandra.ps1:251 char:9 + $p.Start() | Out-Null + ~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : Win32Exception Exception calling "WaitForExit" with "0" argument(s): "No process is associated with this object." At C:\cassandra\bin\cassandra.ps1:253 char:9 + $p.WaitForExit() + ~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : InvalidOperationException

Answer 1

这是看起来像是失败的那一行：

 if ($env:JVM_VERSION.CompareTo("1.8.0") -eq -1

当我在CentOS（Linux）机器上运行java -version时，会看到以下输出：

$ java -version
openjdk version "1.8.0_191"
OpenJDK Runtime Environment (build 1.8.0_191-b12)
OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)

如您所见，第一行的版本以“ 1.8.0_191”的特定格式返回。

关于这点，有两点：

我不知道Java 12的java -version的输出显示什么，但是我知道某些JDK供应商的格式是不同的。例如，AdoptOpenJDK部署导致Cassandra 4.0出现问题（按照此JIRA：https://issues.apache.org/jira/browse/CASSANDRA-14926）。
Cassandra版本3（及更低版本）仅适用于Java8。Cassandra 4（尚未发布）将支持Java11。AFAIK，Java 12尚未发布。

当然，我会安装较低版本的Java。如果您使用的是Cassandra 3，则应安装Java 8的最新补丁。

如果您仍然遇到问题，我将从cassandra-env.ps1文件中删除Java版本检查。不过，这样做的后果自负。

Answer 2

我在Windows 10上遇到了与Cassandra 3.11.7相同的问题，并通过正确设置JAVA_HOME解决了该问题。我发现JAVA_HOME应该指向'bin'的父对象，例如到“ C：\ Program Files \ Java \ jre1.8.0_261”，而不是“ C：\ Program Files \ Java \ jre1.8.0_261 \ bin”。这样就解决了错误“系统找不到指定的路径。”

信用：https://github.com/elastic/elasticsearch/issues/2274

Cassandra不是以cassandra -f

2 个答案: