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https://issues.apache.org/jira/browse/TS-4641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15512054#comment-15512054
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Miles Libbey commented on TS-4641:
----------------------------------

FWIW in 6.2, we think this caused all of our machines to crash 12 hours after 
making the setting.

> Change default for proxy.config.cache.hostdb.sync_frequency
> -----------------------------------------------------------
>
>                 Key: TS-4641
>                 URL: https://issues.apache.org/jira/browse/TS-4641
>             Project: Traffic Server
>          Issue Type: Improvement
>          Components: Configuration, Documentation, HostDB
>            Reporter: Leif Hedstrom
>            Assignee: Leif Hedstrom
>              Labels: incompatible
>             Fix For: 7.1.0
>
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> I'd like to propose that we change this setting, to 0, which means disable 
> HostDB Synchronization. This is an incompatible change, but nonetheless a 
> step in the right direction away from persistent HostDB storage. People can 
> of course still enable it.
> {code}
> diff --git a/mgmt/RecordsConfig.cc b/mgmt/RecordsConfig.cc
> index ed71b5c..7a7e1c7 100644
> --- a/mgmt/RecordsConfig.cc
> +++ b/mgmt/RecordsConfig.cc
> @@ -1078,7 +1078,7 @@ static const RecordElement RecordsConfig[] =
>    {RECT_CONFIG, "proxy.config.hostdb.timed_round_robin", RECD_INT, "0", 
> RECU_DYNAMIC, RR_NULL, RECC_NULL, NULL, RECA_NULL}
>    ,
>    //       # how often should the hostdb be synced (seconds)
> -  {RECT_CONFIG, "proxy.config.cache.hostdb.sync_frequency", RECD_INT, "120", 
> RECU_DYNAMIC, RR_NULL, RECC_NULL, NULL, RECA_NULL}
> +  {RECT_CONFIG, "proxy.config.cache.hostdb.sync_frequency", RECD_INT, "0", 
> RECU_DYNAMIC, RR_NULL, RECC_NULL, NULL, RECA_NULL}
>    ,
>    {RECT_CONFIG, "proxy.config.hostdb.host_file.path", RECD_STRING, NULL, 
> RECU_DYNAMIC, RR_NULL, RECC_NULL, NULL, RECA_NULL}
>    ,
> {code}
> Note that changing  it to 0, or changing it from 0 to something else, 
> requires restart. It's only "dynamic" if it it's not 0 (which turns off the 
> sync cont).



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