cdc panic when eventFeedSession recive the event has empty entries

[knull-cn]

What did you do?

deploy cdc (v6.5.3)and create changefeed

What did you expect to see?

normal and no panic

What did you see instead?

panic

Versions of the cluster

DM version (run dmctl -V or dm-worker -V or dm-master -V):

(paste DM version here, and you must ensure versions of dmctl, DM-worker and DM-master are same)

Upstream MySQL/MariaDB server version:

(paste upstream MySQL/MariaDB server version here)

Downstream TiDB cluster version (execute SELECT tidb_version(); in a MySQL client):

(paste TiDB cluster version here)

How did you deploy DM: tiup or manually?

(leave TiUP or manually here)

Other interesting information (system version, hardware config, etc):

>
>

current status of DM cluster (execute query-status <task-name> in dmctl)

(paste current status of DM cluster here)

[kennytm]

Location of panic (entries.Entries.Entries is empty):

tiflow/cdc/kv/client.go

Line 1085 in 1e2f277

commitTs := entries.Entries.Entries[0].CommitTs

Potential source of empty Entries:

• https://github.com/tikv/tikv/blob/v6.5.3/components/cdc/src/delegate.rs#L689 — Lossy DDL reorg (Ignore lossy DDL change for TiCDC tidb#43227)

[fubinzh]

/severity major

[nongfushanquan]

/assign @hicqu

[seiya-annie]

/label found/gs

[ti-chi-bot]

@seiya-annie: The label(s) found/gs cannot be applied. These labels are supported: duplicate, bug-from-internal-test, bug-from-user, affects-5.3, affects-5.4, affects-6.0, affects-6.1, affects-6.2, affects-6.3, affects-6.4, affects-6.5, affects-6.6, affects-7.0, affects-7.1, affects-7.2, affects-7.3, may-affects-5.3, may-affects-5.4, may-affects-6.0, may-affects-6.1, may-affects-6.2, may-affects-6.3, may-affects-6.4, may-affects-6.5, may-affects-6.6, may-affects-7.0, may-affects-7.1, may-affects-7.2, may-affects-7.3, needs-cherry-pick-release-5.3, needs-cherry-pick-release-5.4, needs-cherry-pick-release-6.0, needs-cherry-pick-release-6.1, needs-cherry-pick-release-6.2, needs-cherry-pick-release-6.3, needs-cherry-pick-release-6.4, needs-cherry-pick-release-6.5, needs-cherry-pick-release-6.6, needs-cherry-pick-release-7.0, needs-cherry-pick-release-7.1, needs-cherry-pick-release-7.2, needs-cherry-pick-release-7.3, question, release-blocker, wontfix, require-LGT1, require-LGT3.

In response to this:

/label found/gs

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

@jebter: These labels are not set on the issue: found/gc.

In response to this:

/remove-found gc

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[jebter]

/remove-found gs

[jebter]

/found gs

[jebter]

/label affects-6.5