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[Bug] event_store on_disk_data_size can overflow to EiB

Status: Open.

#4062 In pingcap/ticdc;

· tenfyzhong opened on Jan 23, 2026

maintainer: unit tests are not hermetic (missing RegionCache service, fixed ports)

severity/moderate

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#4058 In pingcap/ticdc;

· wlwilliamx opened on Jan 23, 2026

Kafka consumer OOM due to memory retention in util.EventsGroup.Resolve

severity/moderate

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#4056 In pingcap/ticdc;

· wlwilliamx opened on Jan 23, 2026

incorrect checkpointTs lag metric

component/metrics-loggingMetrics and logging component.Metrics and logging component.

severity/minor

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#4053 In pingcap/ticdc;

· wk989898 opened on Jan 22, 2026

kafka-consumer may drop replayed DML events based on HighWatermark and cause downstream inconsistency

severity/moderate

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#4051 In pingcap/ticdc;

· wlwilliamx opened on Jan 22, 2026

Changefeed remove/pause can fail due to etcd CAS conflict when persisting progress

severity/moderate

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#4049 In pingcap/ticdc;

· wlwilliamx opened on Jan 22, 2026

improve compression preformance in event store

type/enhancementThe issue or PR belongs to an enhancement.The issue or PR belongs to an enhancement.

Status: Open.

#4041 In pingcap/ticdc;

· lidezhu opened on Jan 22, 2026

Add a metric to show incremental scan progress

type/enhancementThe issue or PR belongs to an enhancement.The issue or PR belongs to an enhancement.

Status: Open.

#4037 In pingcap/ticdc;

· lidezhu opened on Jan 21, 2026

Add a test case for frequent upgrades and downgrades with massive numbers of changefeeds and tables.

type/enhancementThe issue or PR belongs to an enhancement.The issue or PR belongs to an enhancement.

Status: Open.

#4036 In pingcap/ticdc;

· lidezhu opened on Jan 21, 2026

[Limitation] TiCDC can't not handle DDL as alter table xx add column xx datetime default current_timestamp properly

affects-8.5This bug affects the 8.5.x(LTS) versions.This bug affects the 8.5.x(LTS) versions.

affects-9.0This bug affects the 9.0.x versions.This bug affects the 9.0.x versions.

severity/major

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#4007 In pingcap/ticdc;

· haiboumich opened on Jan 15, 2026

With 200,000 tables, the Sync Point got stuck when the CDC server restarted

severity/major

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#4006 In pingcap/ticdc;

· hongyunyan opened on Jan 15, 2026

optimize schema store memory usage during start when there are many tables

type/enhancementThe issue or PR belongs to an enhancement.The issue or PR belongs to an enhancement.

Status: Open.

#3987 In pingcap/ticdc;

· lidezhu opened on Jan 12, 2026