Chun-Hung Hsiao created MESOS-8481:
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Summary: Agent reboot during checkpointing may result in empty
checkpoints.
Key: MESOS-8481
URL: https://issues.apache.org/jira/browse/MESOS-8481
Project: Mesos
Issue Type: Bug
Reporter: Chun-Hung Hsiao
Assignee: Michael Park
An empty checkpoint file was created due to the following incident.
At 17:12:25, the master assigned a task to an agent:
{noformat}
I0123 17:12:25.000000 18618 master.cpp:11457] Adding task 5602 with resources
cpus(allocated: *):0.1; mem(allocated: *):128 on agent
aaf0a62f-a6eb-4c1d-80db-5fdd26fe8008-S4 at slave(1)@<agent_ip>:5051 (<agent_ip>)
I0123 17:12:25.000000 18618 master.cpp:5017] Launching task 5602 of framework
6f9b0688-38f7-4b38-bb1c-421f55e486e5-0112 (Balloon Framework OOM) at
scheduler-fbba22f7-ebbc-4864-8394-0aa558f8ffaa@<ip>:10015 with resources [...]
on agent aaf0a62f-a6eb-4c1d-80db-5fdd26fe8008-S4 at slave(1)@<agent_ip>:5051
(<agent_ip>)
{noformat}
Meanwhile, the agent is being rebooted:
{noformat}
$ last reboot
reboot system boot 3.10.0-693.11.6. Tue Jan 23 17:14 - 00:09 (06:55)
{noformat}
The agent log did not show any information about the task, possibly because
there was no fsync before reboot:
{noformat}
I0123 17:12:09.000000 17237 http.cpp:851] Authorizing principal
'dcos_checks_agent' to GET the endpoint '/metrics/snapshot'
-- Reboot --
I0123 17:15:40.000000 2689 logsink.cpp:89] Added FileSink for glog logs to:
/var/log/mesos/mesos-agent.log
{noformat}
However, the agent was checkpointing the task before reboot:
{noformat}
$ sudo stat
/var/lib/mesos/slave/meta/slaves/aaf0a62f-a6eb-4c1d-80db-5fdd26fe8008-S4/frameworks/6f9b0688-38f7-4b38-bb1c-421f55e486e5-0112/executors/5602/
File:
‘/var/lib/mesos/slave/meta/slaves/aaf0a62f-a6eb-4c1d-80db-5fdd26fe8008-S4/frameworks/6f9b0688-38f7-4b38-bb1c-421f55e486e5-0112/executors/5602/’
Size: 39 Blocks: 0 IO Block: 4096 directory
Device: ca40h/51776d Inode: 67306254 Links: 3
Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Context: system_u:object_r:unlabeled_t:s0
Access: 2018-01-24 00:23:43.237322609 +0000
Modify: 2018-01-23 17:12:25.751463030 +0000
Change: 2018-01-23 17:12:25.751463030 +0000
Birth: -
{noformat}
And since there was no fsync before reboot, all checkpoints resulted in empty
files:
{noformat}
$ sudo stat
/var/lib/mesos/slave/meta/slaves/aaf0a62f-a6eb-4c1d-80db-5fdd26fe8008-S4/frameworks/6f9b0688-38f7-4b38-bb1c-421f55e486e5-0112/framework.info
File:
‘/var/lib/mesos/slave/meta/slaves/aaf0a62f-a6eb-4c1d-80db-5fdd26fe8008-S4/frameworks/6f9b0688-38f7-4b38-bb1c-421f55e486e5-0112/framework.info’
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: ca40h/51776d Inode: 33967500 Links: 1
Access: (0600/-rw-------) Uid: ( 0/ root) Gid: ( 0/ root)
Context: system_u:object_r:unlabeled_t:s0
Access: 2018-01-23 17:15:41.485506070 +0000
Modify: 2018-01-23 17:12:25.749463047 +0000
Change: 2018-01-23 17:12:25.749463047 +0000
Birth: -
$ sudo stat
/var/lib/mesos/slave/meta/slaves/aaf0a62f-a6eb-4c1d-80db-5fdd26fe8008-S4/frameworks/6f9b0688-38f7-4b38-bb1c-421f55e486e5-0112/framework.pid
File:
‘/var/lib/mesos/slave/meta/slaves/aaf0a62f-a6eb-4c1d-80db-5fdd26fe8008-S4/frameworks/6f9b0688-38f7-4b38-bb1c-421f55e486e5-0112/framework.pid’
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: ca40h/51776d Inode: 33967495 Links: 1
Access: (0600/-rw-------) Uid: ( 0/ root) Gid: ( 0/ root)
Context: system_u:object_r:unlabeled_t:s0
Access: 2018-01-23 23:00:42.190975780 +0000
Modify: 2018-01-23 17:12:25.749463047 +0000
Change: 2018-01-23 17:12:25.749463047 +0000
Birth: -
$ sudo stat
/var/lib/mesos/slave/meta/slaves/aaf0a62f-a6eb-4c1d-80db-5fdd26fe8008-S4/frameworks/6f9b0688-38f7-4b38-bb1c-421f55e486e5-0112/executors/5602/executor.info
File:
‘/var/lib/mesos/slave/meta/slaves/aaf0a62f-a6eb-4c1d-80db-5fdd26fe8008-S4/frameworks/6f9b0688-38f7-4b38-bb1c-421f55e486e5-0112/executors/5602/executor.info’
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: ca40h/51776d Inode: 67306255 Links: 1
Access: (0600/-rw-------) Uid: ( 0/ root) Gid: ( 0/ root)
Context: system_u:object_r:unlabeled_t:s0
Access: 2018-01-23 17:12:25.751463030 +0000
Modify: 2018-01-23 17:12:25.751463030 +0000
Change: 2018-01-23 17:12:25.751463030 +0000
Birth: -
{noformat}
So were {{forked.pid}} and {{task.info}}.
As a result, the agent failed to recover after reboot:
{noformat}
E0123 17:15:41.000000 2709 slave.cpp:6800] EXIT with status 1: Failed to
perform recovery: Failed to recover framework
6f9b0688-38f7-4b38-bb1c-421f55e486e5-0112: Failed to read framework info from
'/var/lib/mesos/slave/meta/slaves/aaf0a62f-a6eb-4c1d-80db-5fdd26fe8008-S4/frameworks/6f9b0688-38f7-4b38-bb1c-421f55e486e5-0112/framework.info':
Found an empty file
{noformat}
https://github.com/apache/mesos/blob/a892a2e80255291e6cd5cb3b0e90b9a029989c99/3rdparty/stout/include/stout/protobuf.hpp#L367
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