[ACCUMULO-708] Modify ClassLoader to support different applications / multi-tenancy

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.5.0
• Component/s: start
• Labels: classloader
• Assignee: Dave Marion
• Reporter: Dave Marion
• Created: 31/Jul/12 00:05
• Updated: 02/May/13 02:30
• Resolved: 27/Mar/13 22:54

Description

I'd like to expand the current classloader to support loading classes from HDFS and different application contexts. I'll be modifying the ticket as the idea matures.

Issue Links

• breaks: ACCUMULO-943 Continuous Ingest graphs are broken by VFS extra output
• is duplicated by: ACCUMULO-350 Support loading (reloading?) jars out of hdfs
• is related to: ACCUMULO-926 Extraneous vfs output should be logged (and breaks functional tests)
• relates to: ACCUMULO-350 Support loading (reloading?) jars out of hdfs
• relates to: ACCUMULO-886 Create integration tests for new ClassLoader
• relates to: ACCUMULO-1186 create a script which can bootstrap an entire cluster to run out of hdfs

Sub-Tasks

• Make starting out HDFS easier (bootstrap): Resolved
• Remove old classloader: Resolved
• Support common use cases for loading classes from context (e.g. HDFS): Resolved
• Explore configuring vfs cache: Resolved
• Determine best default classloader hierarchy: Resolved
• Accumulo start unit test rely on ACCUMULO_HOME being set: Resolved
• Replace HDFS VFS FileSystem objects with the ones from Commons VFS: Resolved
• Classloader reloding indirection at wrong level: Resolved
• Additional debug from r1428556 breaks functional tests: Resolved
• Shutdown thread commented out: Resolved
• Can not run as multiple users: Resolved
• document running accumulo from HDFS: Resolved
• Dynamic Classloader lost jars: Resolved
• Document per table classpath: Resolved
• Can not configure iterators when per table classpath is configured: Resolved