Jira (PDB-4975) PDB will not start when sync is configured and garbage collection is disabled

Jarret Lavallee (Jira)

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Dec 3, 2020, 6:36:03 PM12/3/20

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Jarret Lavallee created an issue

PuppetDB /

PDB-4975

PDB will not start when sync is configured and garbage collection is disabled

Issue Type:	Bug
Affects Versions:	PDB 6.13.1
Assignee:	Unassigned
Components:	PuppetDB
Created:	2020/12/03 3:35 PM
Priority:	Normal
Reporter:	Jarret Lavallee

PuppetDB hangs indefinately when starting in 6.13.1 when sync is enabled and garbage collection is disabled. This looks to have been caused by https://tickets.puppetlabs.com/browse/PDB-4938.

PuppetDB stops logging and stays in maintenance mode. The last logs output are as follows.

2020-12-03T13:03:26.752-06:00 INFO [c.z.h.HikariDataSource] PDBReadPool - Start completed.

2020-12-03T13:03:26.850-06:00 INFO [c.z.h.HikariDataSource] PDBWritePool - Starting...

2020-12-03T13:03:26.851-06:00 INFO [c.z.h.HikariDataSource] PDBWritePool - Start completed.

The workaround is to enable garbage collection or disable sync. We enabled garbage collection by setting gc-interval = 20160 in database.ini

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zendesk.jira (Jira)

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Dec 3, 2020, 6:37:04 PM12/3/20

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zendesk.jira updated an issue

PuppetDB /

PDB-4975

PDB will not start when sync is configured and garbage collection is disabled

Change By:	zendesk.jira
Zendesk Ticket Count:	1
Zendesk Ticket IDs:	42226

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zendesk.jira (Jira)

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Dec 3, 2020, 6:38:04 PM12/3/20

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zendesk.jira updated an issue

PuppetDB /

PDB-4975

PDB will not start when sync is configured and garbage collection is disabled

Change By:	zendesk.jira
Labels:	jira_escalated

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Austin Blatt (Jira)

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Dec 3, 2020, 6:40:04 PM12/3/20

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Austin Blatt updated an issue

PuppetDB /

PDB-4975

PDB will not start when sync is configured and garbage collection is disabled

Change By:	Austin Blatt

This only affects {{pe-puppetdb}}.

PuppetDB hangs indefinately when starting in 6.13.1 when sync is enabled and garbage collection is disabled. This looks to have been caused by https://tickets.puppetlabs.com/browse/PDB-4938. In that ticket, in order to prevent deadlocks between initial garbage collection and initial sync on startup, we serialized the initial garbage collection and sync with a promise. When the initial garbage collection completes it delivers on a promise and the initial sync can start. If gc is disabled, the promise is never delivered and sync can never run. The startup process hangs with puppetdb in maintenance mode and nothing more in the logs.

PuppetDB stops logging and stays in maintenance mode. The last logs output are as follows.

{code}

2020-12-03T13:03:26.752-06:00 INFO [c.z.h.HikariDataSource] PDBReadPool - Start completed.
2020-12-03T13:03:26.850-06:00 INFO [c.z.h.HikariDataSource] PDBWritePool - Starting...
2020-12-03T13:03:26.851-06:00 INFO [c.z.h.HikariDataSource] PDBWritePool - Start completed.

{code}

The workaround is to enable garbage collection or disable sync. We enabled garbage collection by setting {{gc-interval = 20160}} in {{database.ini}}