[ACCUMULO-4090] BatchWriter close not cleaning up all resources

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 1.7.0
• Component/s: client
• Assignee: Eric C. Newton
• Reporter: Eric C. Newton
• Created: 23/Dec/15 14:42
• Updated: 02/Nov/22 19:12
• Resolved: 02/Nov/22 19:12

Description

I'm debugging an issue with a long-running ingestor, similar to the TraceServer.

After realizing that BatchWriter close needs to be called when a MutationsRejectedException occurs (see ACCUMULO-4088), a close was added, and the client became more stable.

However, after a day, or so, the client became sluggish. When inspecting a heap dump, many TabletServerBatchWriter objects were still referenced. This server should only have two BatchWriter instances at any one time, and this server had >100.

Still debugging.

The error that initiates the issue is a SessionID not found, presumably because the session timed out. This is the cause of the MutationsRejectedException seen by the client.

Issue Links

• is related to: ACCUMULO-4088 hundreds of Timer threads