Ubuntu 18.04 will be EOL before the next release, so update to the oldest available Debian version.
Also fix one incorrect return value type, a test cast, and adjust some test timeouts.
Eliminate the boilerplate of declaring this and assigning memory to it, which is the same for the vast majority of object creations.
Keep the old version of the macro as OBJ_NEW_BASE_BEGIN() for a few exceptions in the core code and (mostly) in the tests.
Each call to lockAcquireP() passed enough information to initialize the lock system. This was somewhat inefficient and as locks become more complicated it will lead to more code duplication. Since a process can only take one type of lock it makes sense to do most of the initialization up front.
Also reduce the log level of lockRelease() since it is only called at exit and the lock will be released in any case.
Bug Fixes:
* Skip writing recovery.signal by default for restores of offline backups. (Reviewed by Stefan Fercot. Reported by Marcel Borger.)
Features:
* Block incremental backup (BETA). (Reviewed by John Morris, Stephen Frost, Stefan Fercot.)
Improvements:
* Keep only one all-default group index. (Reviewed by Stefan Fercot.)
Documentation Improvements:
* Add explicit instructions for upgrading between 2.x versions. (Contributed by Christophe Courtois. Reviewed by David Steele.)
* Remove references to SSH made obsolete when TLS was introduced.
Bug Fixes:
* Remove the distinction between maps where super block size is equal to block size and maps where they are not. In practice, maps with equal blocks are now rare and most of the optimizations can be applied directly to super blocks where the blocks are equal. This fixes a bug where a map that was created with equal size blocks and then converted to differing block sizes would generate an invalid map.
* Free reads during restore to avoid running out of file handles.
Improvements:
* Store super block sizes in the block map. This allows the final block size to be removed from the block list and provides a more optimal restore and better potential for analysis.
* Always round the super block size up to the next block size. This makes the number of blocks per super block more predictable.
* Allow super block sizes to be changed at will in the map. The first case for this is to store the reduced super block size required when the last super block is short but it could be used to dynamically change the super block size to optimize compression.
* Store a block count rather than a list of blocks in a super block. Blocks must always be sequential, though there may be an offset to the first block in a super block. This saves 11-14% on space for checksum sizes 6-7.
* In the case that all the blocks for a super block are present, and there is no offset, the block size is omitted.
This allows options to be marked as beta, which will require that the --beta option be supplied to prevent accidental usage of a beta feature.
The online and command-line documentation also show warnings when options are beta.
Block sizes are incremented when the size of the map becomes as large as a single block. This is arbitrary but it appears to give a good balance of block size vs map size.
The full backup super block size is set to minimize loss of compression efficiency since most blocks in the database will likely never be modified. For diff/incr backup super blocks, a smaller size is allowable since only modified blocks are stored. The overall savings of not storing unmodified blocks offsets the small loss in compression efficiency due to the smaller super block and allows more granular fetches during restore.
As calculated this size is not correct since it does not include the parts of prior block incrementals that are required to make the current block incremental valid. At best this could be approximated and the resulting values might be very confusing.
For now, at least, exclude this metric for block incremental backups.
xxHash is significantly faster than SHA-1 so this helps reduce the overhead of the feature.
A variable number of bytes are used from the xxHash depending on the block size with a minimum of six bytes for the smallest block size. This keeps the maps smaller while still providing enough bits to detect block changes.
Small blocks sizes can lead to reduced compression efficiency, so allow multiple blocks to be compressed together in a super block. The disadvantage is that the super block must be read sequentially to retrieve blocks. However, different super block sizes can be used for different backup types, so the full backup super block sizes are large for compression efficiency and diff/incr are smaller for retrieval efficiency.
Forks may update pg_control version or WAL magic without affecting the structures that pgBackRest depends on.
This option forces pgBackRest to treat a cluster as the specified version when it cannot be automatically identified.
When restoring an offline backup on PostgreSQL >= 12, skip writing recovery.signal by default since this will error if the backup was made with wal_level=minimal. If the user explicitly sets the type option to something other than none, then write recovery.signal as usual since it is possible to do Point-In-Time-Recovery from an offline backup as long as wal_level was not minimal.
Raw encryption was already being used for block incremental. This commit adds raw compression to block incremental where possible (see da918587).
Raw compression/encryption is also added to bundling for a backup set when block incremental is enabled on the full backup. This prevents a break in backward compatibility since block incremental is not backward compatible.
Raw format saves 12 bytes of header for gzip and 4 bytes of checksum for lz4 (plus CPU overhead). This may not seem like much, but over millions of small files or incremental blocks can really add up. Even though it may be a relatively small percentage of the overall backup size it is still objectively a large amount of data.
Use raw format for protocol compression to exercise the feature.
Raw compression format will be added to bundling and block incremental in a followup commit.
It is possible for a group index to be created for an option that is later found to not meet dependencies. In this case all values would be default leading to a phantom group, which can be quite confusing.
Remove group indexes that are all default (except the final one) and make sure the key for the final all default group index is 1.
Add an explicit statement that there is nothing special to do when upgrading between 2.x versions.
Leave the previous paragraph about the default location that changed between 2.00 and 2.02, as it is more a matter of transitioning from 1.x to 2.x.
The code is not completely reflowed yet so there are some cases that uncrustify will not catch. The formatting will be improved over time.
Some block of code require special formatting so have been surrounded with the {uncrustify-off}/{uncrustify-on} markers. These exceptions should be kept to a minimum.
Add --code-format (to reformat code) and --code-format-check (to check formatting) to test.pl.
Add a CI test that will check code formatting. Code must be correctly formatted before it can be merge to integration.
Add documentation to the coding standards for code formatting.
Improvements:
* Remove support for PostgreSQL 9.0/9.1/9.2. (Reviewed by Stefan Fercot.)
* Restore errors when no backup matches the current version of PostgreSQL. (Contributed by Stefan Fercot. Reviewed by David Steele. Suggested by Soulou.)
* Add compress-level range checking for each compress-type. (Reviewed by Stefan Fercot. Suggested by gkleen, ViperRu.)
Documentation Improvements:
* Add warning about enabling "hierarchical namespace" on Azure storage. (Reviewed by Stefan Fercot. Suggested by Vojtech Galda, Pluggi, asjonos.)
* Add replacement for linefeeds in monitoring example. (Reviewed by Stefan Fercot. Suggested by rudonx, gmustdie, Ivan Shelestov.)
* Clarify target-action behavior on various PostgreSQL versions. (Contributed by Chris Bandy. Reviewed by David Steele, Anton Kurochkin, Stefan Fercot. Suggested by Anton Kurochkin, Chris Bandy.)
* Updates and clarifications to index page. (Reviewed by Stefan Fercot.)
* Add dark mode to the website. (Suggested by Stephen Frost.)
If this feature is enabled expire will fail since directories need to be deleted separately.
Ideally we would add support for this feature but for now we'll just document the issue.
The primary goal of the block incremental backup is to save space in the repository by only storing changed parts of a file rather than the entire file. This implementation is focused on restore performance more than saving space in the repository, though there may be substantial savings depending on the workload.
The repo-block option enables the feature (when repo-bundle is already enabled). The block size is determined based on the file size and age. Very old or very small files will not use block incremental.
The callbacks in iniLoad() made the downstream code more complicated than it needed to be so use an iterator model instead.
Combine the two functions that were used to load the ini data to remove code duplication. In theory it would be nice to use iniValueNext() in the config/parse module rather than loading a KeyValue store but this would mean a big change to the parser, which does not seem worthwhile at this time.
Allocating memory made these functions simpler but it meant that memory was leaking into the calling context when logging was enabled. It is not clear that this was an issue but it seems that trace level logging could result it a lot of memory usage depending on the use case.
This also makes it possible to audit allocations returned to the calling context, which will be done in a followup commit.
Also rename objToLog() to objNameToLog() since it seemed logical to name the new function objToLog().
This should make it a little clearer what the variable (VR) macros are doing since the declaration/definition cannot both be set to extern (but functions can).
Splitting the variable macros out also allows them to be changed in the future with little churn, while changing the function macro creates a large amount of churn.
This is immediately useful because it will detect any extern'd functions or variables that are not being used. It also detects functions or variables that are declared but not defined.
If a FV/VR_EXTERN macro is missing it will be detected either because of a mismatch in the declaration/definition or because a new defined symbol will appear in the nm test.
Eventually the unity build will be used to create a more optimized pgbackrest binary but that will need to wait.
It is probably not a good idea to restore the latest backup when it was not made from the current PostgreSQL version. If there is no backup after a stanza-upgrade then replicas might be built with a prior version leading to failures.
Add an error in this case if the latest backup would be used, i.e. --set or --type=time/lsn is not specified.
In particular the section about other backup solutions not supporting parallel processing was no longer accurate, so reword it.
Also update some other sections that used older nomenclature, had awkward wording, or needed clarification.
The behavior of pause depends on the hot_standby parameter and the PostgreSQL version so mention both.
This behavior has been verified on PostgreSQL 9.6–15. PostgreSQL 12 is an inflection point because the behavior of an unset recovery_target_action with hot_standby=off changed in https://git.postgresql.org/gitweb/?p=postgresql.git;h=2dedf4d9a899b36d1a8ed29be5efbd1b31a8fe85.
The copy command was converting \n to a linefeed, which the json conversion did not like. In a healthy repository there won't be any linefeeds but certain errors can contain them.
Fix by loading into a text field and then replacing the linefeed when converting to jsonb.
The prior range checking was done based on the valid values for gz. While this worked it was a subset of what is available for lz4 and zst.
Allow the range to be specified for each compress-type. Adding this functionality to the parse module would be a better solution but that is a bigger project than this fix deserves, at least for now.
Calculate a checksum of the data stored in the repository when a file is transformed (e.g. compressed). This allows resume and verify to operate without needing to decompress/decrypt the data.
This can also be used to verify more complex formats such as block incremental and allow backups from the repository without needing to decompress the data to verify the checksum.
Add some basic encrypted tests to maintain coverage. These will be expanded in a future commit.
