Lars Volker created IMPALA-6214:
-----------------------------------
Summary: Determine and warn about stuck fragment instances
Key: IMPALA-6214
URL: https://issues.apache.org/jira/browse/IMPALA-6214
Project: IMPALA
Issue Type: Bug
Components: Backend
Reporter: Lars Volker
It would be great to have a programmatic way to determine if a fragment
instance is hung by checking if it’s producing rows periodically. A fragment
instance can appear to be not making progress because its input operator /
fragment may be hung (e.g.the probe side of a join will not be able to make
much progress until the build side is done and the build side itself could be
another chain of joins). It'd be much easier to resolve this dependency chain
programmatically to find the root of the cascade of delay.
Details of algorithm are still unclear. It may be easier to include exec node
states in query profile and analyze those, but this probably requires taking
multiple snapshots of the query profiles over time.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
