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+---
+title: Common Problems and Troubleshooting
+summary: Fix common problems while using TiCDC.
+category: reference
+---
+
+# Common Problems and Troubleshooting
+
+This document includes some common problems that you might have while using TiCDC and provides appropriate solutions. It also summarizes some common operation failures and ways to fix them.
+
+## How to choose start-ts while starting a task
+
+First, you need to know that the `start-ts` of a replication task corresponds to a TSO of the upstream TiDB cluster. The replication task will start its data request from this TSO. Therefore, the `start-ts` should meet two conditions below:
+
+- The value of `start-ts` must be larger than current `tikv_gc_safe_point`, otherwise, an error would occur when creating the task.
+- While starting a task, you need to ensure that the downstream has already got all the data previous to `start-ts`. You can relax this requirement accordingly, if the replication task is for message queue or other scenarios, in which strict data consistency between upstream and downstream is not strictly required.
+
+If `start-ts` is not specified or specified as `0`, when a replication task gets started, TiCDC will get the current TSO from PD and start to replicate data from it.
+
+## When a task gets started, it prompts that some tables cannot be replicated
+
+When you use `cdc cli changefeed create` to create a replication task, TiCDC will check if the upstream tables comply with the [restrictions](/ticdc/ticdc-overview.md#restrictions). If they don't, TiCDC will prompt that `some tables are not eligible to replicate`, and will list out the ineligible tables. If you choose `Y` or `y`, TiCDC will continue creating the replication task and automatically ignore all the updates of these ineligible tables. If you choose other inputs, the replication task will not be created.