Bug#968055: journal uses an unsupported feature, ignoring file

[Michael Biebl]

Am 07.08.20 um 18:02 schrieb Michael Biebl:
> Am 07.08.20 um 15:22 schrieb 積丹尼 Dan Jacobson:

>> # journalctl -f
>> Journal file /var/log/journal/64f9b494837d480e9ecd81ea0cef1551/system at 5cd966d8e5d24653b114e239c300135e-00000000000e3792-0005ac0f7ccf0a84.journal uses an unsupported feature, ignoring file.
>> Use SYSTEMD_LOG_LEVEL=debug journalctl --file=/var/log/journal/64f9b494837d480e9ecd81ea0cef1551/system at 5cd966d8e5d24653b114e239c300135e-00000000000e3792-0005ac0f7ccf0a84.journal to see the details.
>>
>> # SYSTEMD_LOG_LEVEL=debug journalctl --file=/var/log/journal/64f9b494837d480e9ecd81ea0cef1551/system at 5cd966d8e5d24653b114e239c300135e-00000000000e3792-0005ac0f7ccf0a84.journal
>> Journal effective settings seal=no compress=no compress_threshold_bytes=8B
>> Journal file /var/log/journal/64f9b494837d480e9ecd81ea0cef1551/system at 5cd966d8e5d24653b114e239c300135e-00000000000e3792-0005ac0f7ccf0a84.journal has unknown incompatible flags 0xc
>> Failed to open journal file /var/log/journal/64f9b494837d480e9ecd81ea0cef1551/system at 5cd966d8e5d24653b114e239c300135e-00000000000e3792-0005ac0f7ccf0a84.journal: Protocol not supported
>> mmap cache statistics: 0 hit, 1 miss
>> Failed to open files: Protocol not supported
>>
>> Maybe this was caused by me
>> downgrading 246-2 to 245.7-1 ?
> 
> Correct. Keep in mind, that downgrades are in general not supported.

To be more specific: journald was compiled with zstd support in v246 and
this is used as default compression, apparently. Older journalctl
versions don't support zstd.
Maybe we should keep lz4 as default compression (for one additional
release cycle), even if zstd support was enabled. This way we would have
some sort of forward compatibility.

Thoughts? Anyone willing to work on this?

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