On 2010-12-02 17:10, Claudio Martella wrote: > Hi list, > > i reported back about a possible workaround. I tried it today on our cdh > cluster but the problem persists. > I've checked the jobcachedir and the plugins/ directory is actually > unpacked correctly. > How is the content of plugins/ added to classpath? if the content of > plugins is comma-separated, then it will hit just the directory names > and not the jars. > > Any comment about this issue?
Plugins are managed by PluginRepository, which in turn uses PluginClassLoader (an extension of URLClassLoader) to load plugin descriptors and jars (and other resources) from pre-defined folders. Due to the known limitations of URLClassLoader (inability to load jars from jars) this classloader expects that plugin resources and jars will be loaded from plain directories (using java.io.File). That's why the plugins are being unpacked in the "local" deployment mode, and why they need to be unpacked also during map-reduce task setup, into a folder defined in plugin.folders. -- Best regards, Andrzej Bialecki <>< ___. ___ ___ ___ _ _ __________________________________ [__ || __|__/|__||\/| Information Retrieval, Semantic Web ___|||__|| \| || | Embedded Unix, System Integration http://www.sigram.com Contact: info at sigram dot com
