[HDFS-13262] Services should not start threads unnecessarily

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: datanode, namenode, test
• Assignee: Unassigned
• Reporter: Erik Krogen
• Created: 12/Mar/18 20:18
• Updated: 12/Mar/18 20:34

Description

There are a number of services in HDFS that start a thread even if they are disabled. Some services which may not be strictly necessary do not have a way to be disabled. This is particularly bad for the unit tests, in which the number of threads spawned by concurrent MiniDFSCluster-based tests can grow to be very large (e.g. see HDFS-12711)

Issue Links

• mentioned in: Page Loading...

Sub-Tasks

• DiskBalancer should not start a thread if it is disabled: Open
• CacheReplicationMonitor should be able to be disabled completely: Open