Tag Archives: shell replacement

Workaround: Secure DataNode Crashes

A recent Linux kernel update to workaround CVE-2017-1000366 is causing Apache Hadoop’s secure DataNode (and NFS manager) to crash on startup. (Related discussion from Red Hat and Ubuntu) If your systems are running a variant of Apache Hadoop 3.x, you can take advantage of user functions to workaround the Java Invocation API issue that causes… Read More »

Taking Control of Daemons in Apache Hadoop

One of the features in Apache Hadoop 3.x is the ability to replace how the shell scripts work without having to support a code fork. This feature makes adding support for site or OS specific features, such as resource controls around daemons, really easy. To keep things simple, let’s add Linux cgexec support for non-secure… Read More »