# pt-table-checksum stuck on "Waiting to check replicas for differences"

**URL:** <https://forums.percona.com/t/pt-table-checksum-stuck-on-waiting-to-check-replicas-for-differences/6034>\
**Category:** Percona Toolkit\
**Created:** [November 29, 2017, 8:08am UTC](https://forums.percona.com/t/pt-table-checksum-stuck-on-waiting-to-check-replicas-for-differences/6034 "2017-11-29T08:08:13Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Stony](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/stony/32/1201_2.png) [@Stony](https://forums.percona.com/u/Stony)\
**Post date:** [November 29, 2017, 8:08am UTC](https://forums.percona.com/t/pt-table-checksum-stuck-on-waiting-to-check-replicas-for-differences/6034/1 "2017-11-29T08:08:13Z")

</div>

When I run pt-table-checksum, it keep printing,

Waiting to check replicas for differences: 0% 00:00 remain

Waiting to check replicas for differences: 0% 00:00 remain

Waiting to check replicas for differences: 0% 00:00 remain

Waiting to check replicas for differences: 0% 00:00 remain

Waiting to check replicas for differences: 0% 00:00 remain

and I checked the log on slave, it also loop,  
171129 8:34:10 88 Query SELECT MAX(chunk) FROM `percona`.`checksums` WHERE db=‘test’ AND tbl=‘\_logs’ AND master\_crc IS NOT NULL

171129 8:34:11 88 Query SELECT MAX(chunk) FROM `percona`.`checksums` WHERE db=‘test’ AND tbl=‘\_logs’ AND master\_crc IS NOT NULL

171129 8:34:12 88 Query SELECT MAX(chunk) FROM `percona`.`checksums` WHERE db=‘test’ AND tbl=‘\_logs’ AND master\_crc IS NOT NULL

171129 8:34:13 88 Query SELECT MAX(chunk) FROM `percona`.`checksums` WHERE db=‘test’ AND tbl=‘\_logs’ AND master\_crc IS NOT NULL

171129 8:34:15 88 Query SELECT MAX(chunk) FROM `percona`.`checksums` WHERE db=‘test’ AND tbl=‘\_logs’ AND master\_crc IS NOT NULL

171129 8:34:16 88 Query SELECT MAX(chunk) FROM `percona`.`checksums` WHERE db=‘test’ AND tbl=‘\_logs’ AND master\_crc IS NOT NULL

…