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https://issues.apache.org/jira/browse/IMPALA-8274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Ho resolved IMPALA-8274.
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Resolution: Fixed
Fix Version/s: Impala 3.2.0
> Missing update to index into profiles vector in
> Coordinator::BackendState::ApplyExecStatusReport()
> --------------------------------------------------------------------------------------------------
>
> Key: IMPALA-8274
> URL: https://issues.apache.org/jira/browse/IMPALA-8274
> Project: IMPALA
> Issue Type: Bug
> Components: Distributed Exec
> Reporter: Michael Ho
> Assignee: Michael Ho
> Priority: Blocker
> Labels: crash
> Fix For: Impala 3.2.0
>
>
> {{idx}} isn't updated in case we skip a duplicated or stale duplicated update
> of a fragment instance. As a result, we may end up passing the wrong profile
> to {{instance_stats->Update()}}. This may lead to random crashes in
> {{Coordinator::BackendState::InstanceStats::Update}}.
> {noformat}
> int idx = 0;
> const bool has_profile = thrift_profiles.profile_trees.size() > 0;
> TRuntimeProfileTree empty_profile;
> for (const FragmentInstanceExecStatusPB& instance_exec_status :
> backend_exec_status.instance_exec_status()) {
> int64_t report_seq_no = instance_exec_status.report_seq_no();
> int instance_idx =
> GetInstanceIdx(instance_exec_status.fragment_instance_id());
> DCHECK_EQ(instance_stats_map_.count(instance_idx), 1);
> InstanceStats* instance_stats = instance_stats_map_[instance_idx];
> int64_t last_report_seq_no = instance_stats->last_report_seq_no_;
> DCHECK(instance_stats->exec_params_.instance_id ==
> ProtoToQueryId(instance_exec_status.fragment_instance_id()));
> // Ignore duplicate or out-of-order messages.
> if (report_seq_no <= last_report_seq_no) {
> VLOG_QUERY << Substitute("Ignoring stale update for query instance $0
> with "
> "seq no $1", PrintId(instance_stats->exec_params_.instance_id),
> report_seq_no);
> continue; <<--- // XXX bad
> }
> DCHECK(!instance_stats->done_);
> DCHECK(!has_profile || idx < thrift_profiles.profile_trees.size());
> const TRuntimeProfileTree& profile =
> has_profile ? thrift_profiles.profile_trees[idx++] : empty_profile;
> instance_stats->Update(instance_exec_status, profile, exec_summary,
> scan_range_progress);
> {noformat}
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