[IMPALA-9300] Add a limit on the number of nodes that can be blacklisted per query

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Backend
• Epic Color: ghx-label-5
• Assignee: Unassigned
• Reporter: Sahil Takiar
• Created: 16/Jan/20 21:03
• Updated: 16/Jan/20 21:03

Description

We currently have no limit on the number of nodes that can be blacklisted if an Exec() RPC fails.

For data transfer (TransmitData()) RPC failures, we blacklist at most one node per status update (so typically one node per query).

It would be nice to have a global limit on the number of nodes blacklisted to prevent a single query from blacklisting a large part of the cluster. This can help guard against intermittent, cluster-wide, hardware issues that might only last a few seconds. It would be nice if the max number of blacklist-able nodes is a function of the cluster size (e.g. a query cannot blacklist more than a third of the nodes in the cluster).

TBD if the value should be configurable or not.