Merge branch 'minor_doc_updates' into 'master'
Minor doc updates ## What does this MR do? Adds to and clarifies some documentation. Specifically, when using `gdb` to debug you need to detach and exit when done. Next, this clarifies the type of file locking that we require. Thanks to @northrup for the details about mandatory vs. advisory file locking. Note: These were two really small changes so I combined in to one merge request. However, I left the commits separate for clarity. See merge request !4421
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## Required NFS Server features
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**File locking**: GitLab **requires** file locking which is only supported
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natively in NFS version 4. NFSv3 also supports locking as long as
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**File locking**: GitLab **requires** advisory file locking, which is only
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supported natively in NFS version 4. NFSv3 also supports locking as long as
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Linux Kernel 2.6.5+ is used. We recommend using version 4 and do not
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specifically test NFSv3.
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@ -150,6 +150,14 @@ To output a backtrace from all threads at once:
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apply all thread bt
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```
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Once you're done debugging with `gdb`, be sure to detach from the process and
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exit:
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```
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detach
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exit
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```
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## Check for blocking queries
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Sometimes the speed at which Sidekiq processes jobs can be so fast that it can
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