What does "Overlapping blocks found during reloadBlock" mean? #2821

vhadianto · 2022-08-24T01:00:08Z

vhadianto
Aug 24, 2022

We have Grafana Mimir installed in a Kubernetes cluster and Prometheus sending data using the remote write functionality.

It was working fine for a while and recently I'm seeing out of order sample issues in the ingester logs and Prometheus failed to push the data to Mimir.

I saw this thread here: grafana/helm-charts#1517 and tried setting out_of_order_time_window setting to 300s.

But now I'm seeing a different warning in the ingester log:

level=warn ts=2022-08-24T00:48:58.026105186Z caller=db.go:1342 user=anonymous msg="Overlapping blocks found during reloadBlocks" detail="[mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s, blocks: 2]: <ulid: 01GB687XBCZC9RXPBX3NBRDS30, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>, <ulid: 01GB6FR277JPGMQYZ94ZZWWF60, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>"
level=warn ts=2022-08-24T00:49:58.026967239Z caller=db.go:1342 user=anonymous msg="Overlapping blocks found during reloadBlocks" detail="[mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s, blocks: 2]: <ulid: 01GB687XBCZC9RXPBX3NBRDS30, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>, <ulid: 01GB6FR277JPGMQYZ94ZZWWF60, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>"
level=warn ts=2022-08-24T00:50:58.028361965Z caller=db.go:1342 user=anonymous msg="Overlapping blocks found during reloadBlocks" detail="[mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s, blocks: 2]: <ulid: 01GB687XBCZC9RXPBX3NBRDS30, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>, <ulid: 01GB6FR277JPGMQYZ94ZZWWF60, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>"

And Prometheus is still failing to push data to Mimir:

ts=2022-08-24T00:56:39.247Z caller=main.go:535 level=info msg="Starting Prometheus Server" mode=server version="(version=2.37.0, branch=HEAD, revision=b41e0750abf5cc18d8233161560731de05199330)"
ts=2022-08-24T00:56:39.247Z caller=main.go:540 level=info build_context="(go=go1.18.4, user=root@0ebb6827e27f, date=20220714-15:13:18)"
ts=2022-08-24T00:56:39.247Z caller=main.go:541 level=info host_details="(Linux 5.4.144+ #1 SMP Wed Nov 3 09:56:10 PDT 2021 x86_64 prometheus-prometheus-remote-kube-pro-prometheus-0 (none))"
ts=2022-08-24T00:56:39.247Z caller=main.go:542 level=info fd_limits="(soft=1048576, hard=1048576)"
ts=2022-08-24T00:56:39.247Z caller=main.go:543 level=info vm_limits="(soft=unlimited, hard=unlimited)"
ts=2022-08-24T00:56:39.249Z caller=web.go:553 level=info component=web msg="Start listening for connections" address=0.0.0.0:9090
ts=2022-08-24T00:56:39.250Z caller=main.go:972 level=info msg="Starting TSDB ..."
ts=2022-08-24T00:56:39.250Z caller=repair.go:56 level=info component=tsdb msg="Found healthy block" mint=1661219713132 maxt=1661220000000 ulid=01GB4H71F114QRH8BF69MR35PM
ts=2022-08-24T00:56:39.250Z caller=repair.go:56 level=info component=tsdb msg="Found healthy block" mint=1661220000000 maxt=1661227200000 ulid=01GB4M5WJNRQRTBTTFJ4J0GRHF
ts=2022-08-24T00:56:39.250Z caller=repair.go:56 level=info component=tsdb msg="Found healthy block" mint=1661227200000 maxt=1661234400000 ulid=01GB4RMFRYFQYEJM0PWVGGFHVG
ts=2022-08-24T00:56:39.250Z caller=repair.go:56 level=info component=tsdb msg="Found healthy block" mint=1661234400000 maxt=1661241600000 ulid=01GB51FMTXTT2M90YPCJKKSXZ2
ts=2022-08-24T00:56:39.250Z caller=repair.go:56 level=info component=tsdb msg="Found healthy block" mint=1661241600000 maxt=1661248800000 ulid=01GB578AFK7QW4GVKC85J0W4H6
ts=2022-08-24T00:56:39.250Z caller=repair.go:56 level=info component=tsdb msg="Found healthy block" mint=1661248800000 maxt=1661256000000 ulid=01GB5D0Z5NE3G6Q2T6F1YB0TM8
ts=2022-08-24T00:56:39.251Z caller=repair.go:56 level=info component=tsdb msg="Found healthy block" mint=1661256000000 maxt=1661263200000 ulid=01GB5MAY8G6BAG6QQVCTDC292A
ts=2022-08-24T00:56:39.251Z caller=repair.go:56 level=info component=tsdb msg="Found healthy block" mint=1661263200001 maxt=1661270400000 ulid=01GB5WGVQ38Z26V7QN7N5CEJC7
ts=2022-08-24T00:56:39.251Z caller=repair.go:56 level=info component=tsdb msg="Found healthy block" mint=1661270400000 maxt=1661277600000 ulid=01GB63B13RVFG2B5E29SQ75GEF
ts=2022-08-24T00:56:39.251Z caller=repair.go:56 level=info component=tsdb msg="Found healthy block" mint=1661277600022 maxt=1661284800000 ulid=01GB6940PNTPWGCAVCXWKANK5Z
ts=2022-08-24T00:56:39.251Z caller=repair.go:56 level=info component=tsdb msg="Found healthy block" mint=1661284800000 maxt=1661292000000 ulid=01GB6FZVK2963BCTQB8MY6WGNN
ts=2022-08-24T00:56:39.252Z caller=tls_config.go:228 level=info component=web msg="TLS is enabled." http2=true
ts=2022-08-24T00:56:39.334Z caller=head.go:493 level=info component=tsdb msg="Replaying on-disk memory mappable chunks if any"
ts=2022-08-24T00:56:39.783Z caller=head.go:536 level=info component=tsdb msg="On-disk memory mappable chunks replay completed" duration=449.567364ms
ts=2022-08-24T00:56:39.783Z caller=head.go:542 level=info component=tsdb msg="Replaying WAL, this may take a while"
ts=2022-08-24T00:56:45.259Z caller=head.go:578 level=info component=tsdb msg="WAL checkpoint loaded"
ts=2022-08-24T00:56:45.673Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=175 maxSegment=199
ts=2022-08-24T00:56:45.989Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=176 maxSegment=199
ts=2022-08-24T00:56:46.398Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=177 maxSegment=199
ts=2022-08-24T00:56:47.035Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=178 maxSegment=199
ts=2022-08-24T00:56:47.413Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=179 maxSegment=199
ts=2022-08-24T00:56:48.030Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=180 maxSegment=199
ts=2022-08-24T00:56:48.219Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=181 maxSegment=199
ts=2022-08-24T00:56:50.705Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=182 maxSegment=199
ts=2022-08-24T00:56:51.008Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=183 maxSegment=199
ts=2022-08-24T00:56:51.470Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=184 maxSegment=199
ts=2022-08-24T00:56:52.358Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=185 maxSegment=199
ts=2022-08-24T00:56:52.438Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=186 maxSegment=199
ts=2022-08-24T00:56:52.612Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=187 maxSegment=199
ts=2022-08-24T00:56:54.830Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=188 maxSegment=199
ts=2022-08-24T00:56:55.128Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=189 maxSegment=199
ts=2022-08-24T00:56:56.141Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=190 maxSegment=199
ts=2022-08-24T00:56:58.218Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=191 maxSegment=199
ts=2022-08-24T00:56:59.290Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=192 maxSegment=199
ts=2022-08-24T00:56:59.732Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=193 maxSegment=199
ts=2022-08-24T00:57:00.068Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=194 maxSegment=199
ts=2022-08-24T00:57:01.227Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=195 maxSegment=199
ts=2022-08-24T00:57:01.702Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=196 maxSegment=199
ts=2022-08-24T00:57:02.036Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=197 maxSegment=199
ts=2022-08-24T00:57:06.415Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=198 maxSegment=199
ts=2022-08-24T00:57:06.415Z caller=head.go:613 level=info component=tsdb msg="WAL segment loaded" segment=199 maxSegment=199
ts=2022-08-24T00:57:06.415Z caller=head.go:619 level=info component=tsdb msg="WAL replay completed" checkpoint_replay_duration=5.475826416s wal_replay_duration=21.156232681s total_replay_duration=27.08171013s
ts=2022-08-24T00:57:07.555Z caller=main.go:993 level=info fs_type=EXT4_SUPER_MAGIC
ts=2022-08-24T00:57:07.555Z caller=main.go:996 level=info msg="TSDB started"
ts=2022-08-24T00:57:07.555Z caller=main.go:1177 level=info msg="Loading configuration file" filename=/etc/prometheus/config_out/prometheus.env.yaml
ts=2022-08-24T00:57:07.705Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Starting WAL watcher" queue=92c4a4
ts=2022-08-24T00:57:07.705Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Starting scraped metadata watcher"
ts=2022-08-24T00:57:07.706Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Replaying WAL" queue=92c4a4
ts=2022-08-24T00:57:07.706Z caller=kubernetes.go:326 level=info component="discovery manager scrape" discovery=kubernetes msg="Using pod service account via in-cluster config"
ts=2022-08-24T00:57:07.706Z caller=kubernetes.go:326 level=info component="discovery manager scrape" discovery=kubernetes msg="Using pod service account via in-cluster config"
ts=2022-08-24T00:57:07.707Z caller=kubernetes.go:326 level=info component="discovery manager scrape" discovery=kubernetes msg="Using pod service account via in-cluster config"
ts=2022-08-24T00:57:07.708Z caller=kubernetes.go:326 level=info component="discovery manager scrape" discovery=kubernetes msg="Using pod service account via in-cluster config"
ts=2022-08-24T00:57:07.709Z caller=kubernetes.go:326 level=info component="discovery manager scrape" discovery=kubernetes msg="Using pod service account via in-cluster config"
ts=2022-08-24T00:57:07.774Z caller=main.go:1214 level=info msg="Completed loading of configuration file" filename=/etc/prometheus/config_out/prometheus.env.yaml totalDuration=218.475358ms db_storage=2.19µs remote_storage=416.9µs web_handler=700ns query_engine=920ns scrape=397.47µs scrape_sd=3.921699ms notify=1.431µs notify_sd=2.809µs rules=63.965043ms tracing=8.45µs
ts=2022-08-24T00:57:07.774Z caller=main.go:957 level=info msg="Server is ready to receive web requests."
ts=2022-08-24T00:57:07.774Z caller=manager.go:941 level=info component="rule manager" msg="Starting rule manager..."
ts=2022-08-24T00:57:12.538Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Done replaying WAL" duration=4.832853722s
ts=2022-08-24T00:57:47.845Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Remote storage resharding" from=1 to=2
ts=2022-08-24T00:57:57.754Z caller=dedupe.go:112 component=remote level=warn remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Skipping resharding, last successful send was beyond threshold" lastSendTimestamp=1661302664 minSendTimestamp=1661302667
ts=2022-08-24T00:58:07.706Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Currently resharding, skipping."
ts=2022-08-24T00:58:17.721Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Remote storage resharding" from=2 to=31
ts=2022-08-24T00:58:27.737Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Remote storage resharding" from=31 to=58
ts=2022-08-24T00:58:37.706Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Remote storage resharding" from=58 to=200

Help anyone?

Answered by pstibrany

Aug 24, 2022

But now I'm seeing a different warning in the ingester log:

level=warn ts=2022-08-24T00:48:58.026105186Z caller=db.go:1342 user=anonymous msg="Overlapping blocks found during reloadBlocks" detail="[mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s, blocks: 2]: <ulid: 01GB687XBCZC9RXPBX3NBRDS30, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>, <ulid: 01GB6FR277JPGMQYZ94ZZWWF60, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>"
level=warn ts=2022-08-24T00:49:58.026967239Z caller=db.go:1342 user=anonymous msg="Overlapping blocks found during reloadBlocks" detail="[mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s, blocks: 2]: <ulid: 01GB687XBCZC9RXPBX3NB…

View full answer

pstibrany · 2022-08-24T07:02:57Z

pstibrany
Aug 24, 2022
Maintainer

But now I'm seeing a different warning in the ingester log:

level=warn ts=2022-08-24T00:48:58.026105186Z caller=db.go:1342 user=anonymous msg="Overlapping blocks found during reloadBlocks" detail="[mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s, blocks: 2]: <ulid: 01GB687XBCZC9RXPBX3NBRDS30, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>, <ulid: 01GB6FR277JPGMQYZ94ZZWWF60, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>"
level=warn ts=2022-08-24T00:49:58.026967239Z caller=db.go:1342 user=anonymous msg="Overlapping blocks found during reloadBlocks" detail="[mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s, blocks: 2]: <ulid: 01GB687XBCZC9RXPBX3NBRDS30, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>, <ulid: 01GB6FR277JPGMQYZ94ZZWWF60, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>"
level=warn ts=2022-08-24T00:50:58.028361965Z caller=db.go:1342 user=anonymous msg="Overlapping blocks found during reloadBlocks" detail="[mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s, blocks: 2]: <ulid: 01GB687XBCZC9RXPBX3NBRDS30, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>, <ulid: 01GB6FR277JPGMQYZ94ZZWWF60, mint: 1661277600022, maxt: 1661284800000, range: 1h59m59s>"

This is expected when using support for ingesting out of order samples. We have reduced its log level to debug, as it's not an actionable message. In future versions of Mimir (2.3 and later), it will not be logged as warning.

You can safely ignore this message.

0 replies

pstibrany · 2022-08-24T07:04:24Z

pstibrany
Aug 24, 2022
Maintainer

And Prometheus is still failing to push data to Mimir:

Why do you think that is the case? I don't see anything in the log messages indicating that.

5 replies

vhadianto Aug 24, 2022
Author

Thanks for responding.

And Prometheus is still failing to push data to Mimir:

Why do you think that is the case? I don't see anything in the log messages indicating that.

Yes you're right. My error, we do have data in Mimir but there are plenty of gaps. I believe this is because Prometheus pod (we're running it in Kubernetes) keeps crashing:

NAME                                                   READY   STATUS    RESTARTS   AGE
prometheus-prometheus-remote-kube-pro-prometheus-0     1/2     Running   263        32h

So it has restarted 263 times in the past 32 hours.

Sorry, just realised that the logs that I pasted earlier didn't show the errors. This logs probably more appropriate as it's showing the last log entries before the pod crashed:

ts=2022-08-24T10:07:48.644Z caller=kubernetes.go:326 level=info component="discovery manager scrape" discovery=kubernetes msg="Using pod service account via in-cluster config"
ts=2022-08-24T10:07:48.717Z caller=main.go:1214 level=info msg="Completed loading of configuration file" filename=/etc/prometheus/config_out/prometheus.env.yaml totalDuration=230.777031ms db_storage=2.36µs remote_storage=423.47µs web_handler=580ns query_engine=1.34µs scrape=468.06µs scrape_sd=4.1841ms notify=1.43µs notify_sd=3.13µs rules=72.532727ms tracing=9.81µs
ts=2022-08-24T10:07:48.717Z caller=main.go:957 level=info msg="Server is ready to receive web requests."
ts=2022-08-24T10:07:48.717Z caller=manager.go:941 level=info component="rule manager" msg="Starting rule manager..."
ts=2022-08-24T10:07:53.703Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Done replaying WAL" duration=5.063383179s
ts=2022-08-24T10:08:28.643Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Remote storage resharding" from=1 to=4
ts=2022-08-24T10:08:40.044Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Currently resharding, skipping."
ts=2022-08-24T10:09:02.132Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Remote storage resharding" from=4 to=19
ts=2022-08-24T10:09:19.279Z caller=dedupe.go:112 component=remote level=warn remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Skipping resharding, last successful send was beyond threshold" lastSendTimestamp=1661335742 minSendTimestamp=1661335749
ts=2022-08-24T10:09:39.428Z caller=dedupe.go:112 component=remote level=info remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Remote storage resharding" from=19 to=200
ts=2022-08-24T10:09:48.608Z caller=stdlib.go:105 level=error component=web caller="timeout waiting for SETTINGS frames from 169.254.169.252:37260" msg=
ts=2022-08-24T10:10:27.543Z caller=dedupe.go:112 component=remote level=warn remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Failed to send batch, retrying" err="Post \"https://<redacted>/api/v1/push\": context deadline exceeded"
ts=2022-08-24T10:10:44.168Z caller=stdlib.go:105 level=error component=web caller="http: TLS handshake error from 192.168.20.146:34506" msg=EOF
ts=2022-08-24T10:10:48.730Z caller=stdlib.go:105 level=error component=web caller="http: TLS handshake error from 169.254.169.252:39136" msg=EOF
ts=2022-08-24T10:11:27.800Z caller=dedupe.go:112 component=remote level=warn remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Failed to send batch, retrying" err="Post \"https://<redacted>/api/v1/push\": context deadline exceeded"
ts=2022-08-24T10:11:28.387Z caller=dedupe.go:112 component=remote level=warn remote_name=92c4a4 url=https://<redacted>/api/v1/push msg="Failed to send batch, retrying" err="Post \"https://<redacted>/api/v1/push\": dial tcp 35.236.238.30:443: i/o timeout"

Any suggestion where I should look for the frequent crashes and the timeout when sending the batch to Mimir?

pracucci Aug 24, 2022
Maintainer

Prometheus shouldn't crash in any case. If you run kubectl describe prometheus-prometheus-remote-kube-pro-prometheus-0 you should be able to look at why it restarted (e.g. OOMKilled? If so, try to give it more memory).

url=https:///api/v1/push

I noticed you're using https endpoint to write to Mimir. Can you confirm that you configured HTTPS for the Mimir ingress? If not, please switch to HTTP protocol.

vhadianto Aug 24, 2022
Author

kubectl describe pods prometheus-prometheus-remote-kube-pro-prometheus-0

Thanks for the tip. It looks like both the liveness and readiness probe failed.

I'm thinking now that this doesn't look like related to the original problem which was the out of order sample issue and the subsequent warning message that is expected. Although the timing (the start of the out of order sample issue and the probes failing) looks very suspiciously correlated, could be a true coincidence but.

I'll mark this question as answered for now, if it turns out to be related I will revisit.

Thanks for your help :)

vhadianto Aug 24, 2022
Author

I noticed you're using https endpoint to write to Mimir. Can you confirm that you configured HTTPS for the Mimir ingress? If not, please switch to HTTP protocol.

Yes we configured HTTPS for Mimir. I think the fact that we have some data pushed by Prometheus (when it was up) shows that it's configured correctly?

pracucci Aug 25, 2022
Maintainer

Yes we configured HTTPS for Mimir. I think the fact that we have some data pushed by Prometheus (when it was up) shows that it's configured correctly?

Right.

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What does "Overlapping blocks found during reloadBlock" mean? #2821

vhadianto Aug 24, 2022

Replies: 2 comments · 5 replies

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