[ACCUMULO-3471] Adding a new tserver puts some tables offline for few minutes

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 1.6.1
• Component/s: tserver

Environment

Ubuntu 12.04

• Assignee: Unassigned
• Reporter: Denis Petrov
• Created: 12/Jan/15 17:17
• Updated: 16/Apr/19 18:08
• Resolved: 16/Apr/19 18:08

Description

I run an Accumulo cluster with 15 tservers with about 6000 tablets on each (disks are quite slow - each node has 2*4Tb SATA)

When a new tserver added to the cluster, the rebalancing procedure starts.

During this procedure some tablets are offline and unreachable during 5-10 minutes.
It is visible in http://monitor:50095/tables and by timeouts on client side.

The rebalancing caused by killing a tserver converges much faster then rebalancing caused by adding a tserver.

Issue Links

• relates to: ACCUMULO-1085 make the number of threads for assignment configurable