The compactor combines several pack files together by including all objects contained in each pack file into the same output pack. If an object appears multiple times, it is only included once in the result. Because the new pack is constructed by enumerating the indexes of the source packs, it is quicker than doing a full repack of the repository, however the result is not nearly as space efficient as new delta compression is disabled.
This method is suitable for quickly combining several packs together after receiving a number of small fetch or push operations into a repository, allowing the system to maintain reasonable read performance without expending a lot of time repacking the entire repository.
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionadd
(DfsPackFile pack) Add a pack to be compacted.add
(DfsReftable table) Add a reftable to be compacted.autoAdd()
Automatically select pack and reftables to be included, and add them.void
Compact the pack files together.exclude
(DfsPackFile pack) Exclude objects from the compacted pack.exclude
(ObjectIdSet set) Exclude objects from the compacted pack.Get new packs created by this compaction.Get statistics corresponding to thegetNewPacks()
.Get all of the source packs that fed into this compaction.Set configuration to write a reftable.
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Constructor Details
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DfsPackCompactor
Initialize a pack compactor.- Parameters:
repository
- repository objects to be packed will be read from.
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Method Details
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setReftableConfig
Set configuration to write a reftable.- Parameters:
cfg
- configuration to write a reftable. Reftable compacting is disabled (default) whencfg
isnull
.- Returns:
this
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add
Add a pack to be compacted.All of the objects in this pack will be copied into the resulting pack. The resulting pack will order objects according to the source pack's own description ordering (which is based on creation date), and then by the order the objects appear in the source pack.
- Parameters:
pack
- a pack to combine into the resulting pack.- Returns:
this
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add
Add a reftable to be compacted.- Parameters:
table
- a reftable to combine.- Returns:
this
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autoAdd
Automatically select pack and reftables to be included, and add them.Packs are selected based on size, smaller packs get included while bigger ones are omitted.
- Returns:
this
- Throws:
IOException
- existing packs cannot be read.
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exclude
Exclude objects from the compacted pack.- Parameters:
set
- objects to not include.- Returns:
this
.
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exclude
Exclude objects from the compacted pack.- Parameters:
pack
- objects to not include.- Returns:
this
.- Throws:
IOException
- pack index cannot be loaded.
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compact
Compact the pack files together.- Parameters:
pm
- progress monitor to receive updates on as packing may take a while, depending on the size of the repository.- Throws:
IOException
- the packs cannot be compacted.
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getSourcePacks
Get all of the source packs that fed into this compaction.- Returns:
- all of the source packs that fed into this compaction.
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getNewPacks
Get new packs created by this compaction.- Returns:
- new packs created by this compaction.
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getNewPackStatistics
Get statistics corresponding to thegetNewPacks()
. May be null if statistics are not available.- Returns:
- statistics corresponding to the
getNewPacks()
.
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