# Cannot read Prometheus exposition data: cannot read a block of data in 0.000s **URL:** \ **Category:** Percona Monitoring and Management (PMM)\ **Created:** [December 13, 2022, 12:26pm UTC](https://forums.percona.com/t/cannot-read-prometheus-exposition-data-cannot-read-a-block-of-data-in-0-000s/19097 "2022-12-13T12:26:52Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Naresh9999](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/naresh9999/32/5568_2.png) [@Naresh9999](https://forums.percona.com/u/Naresh9999)\ **Post date:** [December 13, 2022, 12:26pm UTC](https://forums.percona.com/t/cannot-read-prometheus-exposition-data-cannot-read-a-block-of-data-in-0-000s/19097/1 "2022-12-13T12:26:52Z")
Can someone please help me on the below error? Dec 13 04:17:15 test pmm-agent: #033[36mINFO#033[0m[2022-12-13T04:17:15.151-08:00] 2022-12-13T12:17:15.150Z#011error#011VictoriaMetrics/lib/promscrape/scrapework.go:355#011error when scraping “[http://127.0.0.1:42003/metrics?collect[]=auto\_increment.columns&collect[]=binlog\_size&collect[]=custom\_query.lr&collect[]=engine\_tokudb\_status&collect[]=global\_variables&collect[]=heartbeat&collect[]=info\_schema.clientstats&collect[]=info\_schema.innodb\_tablespaces&collect[]=info\_schema.tables&collect[]=info\_schema.tablestats&collect[]=info\_schema.userstats&collect[]=perf\_schema.eventsstatements&collect[]=perf\_schema.file\_instances&collect[]=perf\_schema.indexiowaits&collect[]=perf\_schema.tableiowaits](http://127.0.0.1:42003/metrics?collect%5B%5D=auto_increment.columns&collect%5B%5D=binlog_size&collect%5B%5D=custom_query.lr&collect%5B%5D=engine_tokudb_status&collect%5B%5D=global_variables&collect%5B%5D=heartbeat&collect%5B%5D=info_schema.clientstats&collect%5B%5D=info_schema.innodb_tablespaces&collect%5B%5D=info_schema.tables&collect%5B%5D=info_schema.tablestats&collect%5B%5D=info_schema.userstats&collect%5B%5D=perf_schema.eventsstatements&collect%5B%5D=perf_schema.file_instances&collect%5B%5D=perf_schema.indexiowaits&collect%5B%5D=perf_schema.tableiowaits)” from job “mysqld\_exporter\_agent\_id\_d821abf0-d2d3-4934-97e5-3be050b6e248\_lr” with labels {APP\_TYPE=“QA\_ALL\_TRACKS”,DB\_SERVICE\_TYPE=“GALERA\_CLUSTER(test/402/403)”,ENV=“C-STACK-QA”,SERVICE\_RUNNING=“MariaDB”,agent\_id=“/agent\_id/d821abf0-d2d3-4934-97e5-3be050b6e248”,agent\_type=“mysqld\_exporter”,cluster=“C-QA4”,environment=“C-STACK-QA”,instance=“/agent\_id/d821abf0-d2d3-4934-97e5-3be050b6e248”,job=“mysqld\_exporter\_agent\_id\_d821abf0-d2d3-4934-97e5-3be050b6e248\_lr”,machine\_id=“/machine\_id/4e4c02654583449ea8e09f4b826d25be”,node\_id=“/node\_id/fcce5539-0b03-4d80-94c9-8cb704afb61c”,node\_name=“test”,node\_type=“generic”,service\_id=“/service\_id/0037b4f1-1ede-465a-9eb4-75d180790b20”,service\_name=“C-QA4-401”,service\_type=“mysql”}: cannot read Prometheus exposition data: cannot read a block of data in 0.000s: the response from “[http://127.0.0.1:42003/metrics?collect[]=auto\_increment.columns&collect[]=binlog\_size&collect[]=custom\_query.lr&collect[]=engine\_tokudb\_status&collect[]=global\_variables&collect[]=heartbeat&collect[]=info\_schema.clientstats&collect[]=info\_schema.innodb\_tablespaces&collect[]=info\_schema.tables&collect[]=info\_schema.tablestats&collect[]=info\_schema.userstats&collect[]=perf\_schema.eventsstatements&collect[]=perf\_schema.file\_instances&collect[]=perf\_schema.indexiowaits&collect[]=perf\_schema.tableiowaits](http://127.0.0.1:42003/metrics?collect%5B%5D=auto_increment.columns&collect%5B%5D=binlog_size&collect%5B%5D=custom_query.lr&collect%5B%5D=engine_tokudb_status&collect%5B%5D=global_variables&collect%5B%5D=heartbeat&collect%5B%5D=info_schema.clientstats&collect%5B%5D=info_schema.innodb_tablespaces&collect%5B%5D=info_schema.tables&collect%5B%5D=info_schema.tablestats&collect%5B%5D=info_schema.userstats&collect%5B%5D=perf_schema.eventsstatements&collect%5B%5D=perf_schema.file_instances&collect%5B%5D=perf_schema.indexiowaits&collect%5B%5D=perf_schema.tableiowaits)” exceeds -promscrape.maxScrapeSize=16777216; either reduce the response size for the target or increase -promscrape.maxScrapeSize #033[36magentID#033[0m=/agent\_id/8e573894-7ea9-4ade-99e1-a8741356f128 #033[36mcomponent#033[0m=agent-process #033[36mtype#033[0m=vm\_agent ---
**Author:** ![Naresh9999](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/naresh9999/32/5568_2.png) [@Naresh9999](https://forums.percona.com/u/Naresh9999)\ **Post date:** [December 14, 2022, 3:08am UTC](https://forums.percona.com/t/cannot-read-prometheus-exposition-data-cannot-read-a-block-of-data-in-0-000s/19097/2 "2022-12-14T03:08:23Z")
Can someone please help me on this? ---
**Author:** ![Naresh9999](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/naresh9999/32/5568_2.png) [@Naresh9999](https://forums.percona.com/u/Naresh9999)\ **Post date:** [December 14, 2022, 11:55am UTC](https://forums.percona.com/t/cannot-read-prometheus-exposition-data-cannot-read-a-block-of-data-in-0-000s/19097/3 "2022-12-14T11:55:52Z")
Can someone please help me on this? ---
**Author:** ![Naresh9999](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/naresh9999/32/5568_2.png) [@Naresh9999](https://forums.percona.com/u/Naresh9999)\ **Post date:** [December 15, 2022, 4:33am UTC](https://forums.percona.com/t/cannot-read-prometheus-exposition-data-cannot-read-a-block-of-data-in-0-000s/19097/4 "2022-12-15T04:33:04Z")
Can someone please help me on this? ---
**Author:** ![Anton\_Bystrov](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/anton_bystrov/32/4880_2.png) [@Anton\_Bystrov](https://forums.percona.com/u/Anton_Bystrov)\ **Post date:** [December 20, 2022, 12:35pm UTC](https://forums.percona.com/t/cannot-read-prometheus-exposition-data-cannot-read-a-block-of-data-in-0-000s/19097/5 "2022-12-20T12:35:31Z")
Hello! Can you describe your instances and environment? ---
**Author:** ![Naresh9999](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/naresh9999/32/5568_2.png) [@Naresh9999](https://forums.percona.com/u/Naresh9999)\ **Post date:** [December 26, 2022, 6:49am UTC](https://forums.percona.com/t/cannot-read-prometheus-exposition-data-cannot-read-a-block-of-data-in-0-000s/19097/6 "2022-12-26T06:49:49Z")
Hi @Anton_Bystrov We have MariaDB 10.5 enterprise version with Galera cluster. Operating System: Centos 7 ---
**Author:** ![Anton\_Bystrov](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/anton_bystrov/32/4880_2.png) [@Anton\_Bystrov](https://forums.percona.com/u/Anton_Bystrov)\ **Post date:** [December 26, 2022, 7:30am UTC](https://forums.percona.com/t/cannot-read-prometheus-exposition-data-cannot-read-a-block-of-data-in-0-000s/19097/7 "2022-12-26T07:30:02Z")
Hello! @Naresh9999 Looks like you have too big response ( promscrape.maxScrapeSize is the maximum size of scrape response in bytes to process from Prometheus targets. By default it 16777216) May be you have a lot of databases and tables and you turn on some custom queries? ---
**Author:** ![Naresh9999](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/naresh9999/32/5568_2.png) [@Naresh9999](https://forums.percona.com/u/Naresh9999)\ **Post date:** [December 26, 2022, 6:07pm UTC](https://forums.percona.com/t/cannot-read-prometheus-exposition-data-cannot-read-a-block-of-data-in-0-000s/19097/8 "2022-12-26T18:07:03Z")
Hi @Anton_Bystrov I have enabled only the slow log and table stats report on that database, If I disable then will that resolve the issue? ---
**Author:** ![Anton\_Bystrov](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/anton_bystrov/32/4880_2.png) [@Anton\_Bystrov](https://forums.percona.com/u/Anton_Bystrov)\ **Post date:** [December 27, 2022, 6:17am UTC](https://forums.percona.com/t/cannot-read-prometheus-exposition-data-cannot-read-a-block-of-data-in-0-000s/19097/9 "2022-12-27T06:17:49Z")
How many databases and tables do you have? ---
**Author:** ![Naresh9999](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/naresh9999/32/5568_2.png) [@Naresh9999](https://forums.percona.com/u/Naresh9999)\ **Post date:** [December 27, 2022, 10:45am UTC](https://forums.percona.com/t/cannot-read-prometheus-exposition-data-cannot-read-a-block-of-data-in-0-000s/19097/10 "2022-12-27T10:45:05Z")
Hi @Anton_Bystrov I have total 121 databases and tables count around 4000.