在启动Cassandra RHEL 6.5时出现JNA链接问题

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在启动Cassandra RHEL 6.5时出现JNA链接问题

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我正试图在我的RHEL 6.5服务器上设置Cassandra。当我启动Cassandra时，会出现与JNA相关的ERROR。异常显示找不到类。但是，我在日志中看到jna jar已添加到classpath中。我尝试使用apache-cassandra-3.0.0和apache-cassandra-2.2.3，两者都出现了同样的异常。我发现jna jar可在$CASSANDRA_HOME/lib和/usr/share/java中获得。安装的jna jar版本为4.0.0。非常感谢您的任何帮助。以下是启动日志 -

INFO 05:57:57 Classpath: /home/cassandra-new/apache-cassandra-2.2.3/conf:/home/cassandra-new/apache-cassandra-2.2.3/build/classes/main:/home/cassandra-new/apache-cassandra-2.2.3/build/classes/thrift:/home/cassandra-new/apache-cassandra-2.2.3/lib/airline-0.6.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/antlr-runtime-3.5.2.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/apache-cassandra-2.2.3.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/apache-cassandra-clientutil-2.2.3.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/apache-cassandra-thrift-2.2.3.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/cassandra-driver-core-2.2.0-rc2-SNAPSHOT-20150617-shaded.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/commons-cli-1.1.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/commons-codec-1.2.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/commons-lang3-3.1.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/commons-math3-3.2.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/compress-lzf-0.8.4.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/concurrentlinkedhashmap-lru-1.4.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/crc32ex-0.1.1.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/disruptor-3.0.1.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/ecj-4.4.2.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/guava-16.0.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/high-scale-lib-1.0.6.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/jackson-core-asl-1.9.2.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/jackson-mapper-asl-1.9.2.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/jamm-0.3.0.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/javax.inject.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/jbcrypt-0.3m.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/jcl-over-slf4j-1.7.7.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/jna-4.0.0.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/joda-time-2.4.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/json-simple-1.1.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/libthrift-0.9.2.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/log4j-over-slf4j-1.7.7.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/logback-classic-1.1.3.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/logback-core-1.1.3.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/lz4-1.3.0.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/metrics-core-3.1.0.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/metrics-logback-3.1.0.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/netty-all-4.0.23.Final.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/ohc-core-0.3.4.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/ohc-core-j8-0.3.4.jar:/home/cassandra-new/apache-cassandra-2.2.3/lib/reporter-config3-3

- hellboy

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- hellboy · Accepted Answer

我浏览了CLibrary.java中的代码，并找到了以下捕获异常的代码 -

catch (UnsatisfiedLinkError e)
{
    logger.warn("JNA link failure, one or more native method will be unavailable.");
    logger.trace("JNA link failure details: {}", e.getMessage());
}

我通过更改conf/logback.xml中的日志级别为TRACE来重新启动Cassandra，以打印额外的详细信息 -

<logger name="org.apache.cassandra" level="TRACE"/>

我现在能看出真正的问题是 -

/tmp/jna-3506402/jna6068045839690239595.tmp：无法从共享对象中映射段：操作不允许

这个问题是由于/tmp文件夹上的noexec标志引起的。

然后我决定通过更改选项来更改tmp文件夹：
-Djava.io.tmpdir=/home/cassandra/tmp 这解决了问题。

我在cassandra-env.sh文件中添加了选项。添加以下声明 -

JVM_OPTS="$JVM_OPTS -Djava.io.tmpdir=/home/cassandra/tmp"