It was reported in [1] that 197e3393a5 led
to a performance regression in a BFG benchmark. Analysis showed that
this is caused by the exists() method in FS_POSIX, now overriding the
default implementation in FS. The default implementation of FS.exists()
uses java.io.File.exists(), while the new implementation in FS_POSIX
uses java.nio.file.Files.exists() - by simply removing the override in
FS_POSIX, performance was restored.
Profiling showed that java.nio.file.Files.exists() is substantially
slower than java.io.File.exists(), to the point where the exists() call
doubles the average cost of a call to
ObjectDirectory.insertUnpackedObject() - which the BFG uses a lot,
because it's rewriting history. Average times measured on Ubuntu were:
java.io.File.exists() - 4 microseconds
java.nio.file.Files.exists() - 60 microseconds
The loose object exists test should be using java.io.File and not FS.
ObjectDirectory uses FS.resolve() to traverse symlinks to objects but
then once inside objects all 256 sharded directories should be real
directories, and the object files should be real files, not dangling
symlinks. java.io.File.exists() is sufficient here, and faster.
Change ObjectDirectory to use File.exists() once its computed the File
handle.
This does mean JGit cannot run ObjectDirectory code on an abstract
virtual filesystem plugged into NIO2. If you really want to run JGit on
an esoteric non-standard filesystem like "in memory" you should look at
the DFS storage backend, which has fewer abstraction points to deal
with. Or write your own from scratch.
[1] https://dev.eclipse.org/mhonarc/lists/jgit-dev/msg02954.html
Change-Id: I74684dc3957ae1ca52a7097f83a6c420aa24310f
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
- add @since annotation for new API method
- silence non-externalized String warning
Change-Id: I864176ced64e9569e7f2cdf8f777720655bfc578
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
On a local filesystem the packed-refs file will be orphaned if it is
replaced by another client while the current client is reading the old
one. However, since NFS servers do not keep track of open files, instead
of orphaning the old packed-refs file, such a replacement will cause the
old file to be garbage collected instead. A stale file handle exception
will be raised on NFS servers if the file is garbage collected (deleted)
on the server while it is being read. Since we no longer have access to
the old file in these cases, the previous code would just fail. However,
in these cases, reopening the file and rereading it will succeed (since
it will reopen the new replacement file). So retrying the read is a
viable strategy to deal with stale file handles on the packed-refs file,
implement such a strategy.
Since it is possible that the packed-refs file could be replaced again
while rereading it (multiple consecutive updates can easily occur with
ref deletions), loop on stale file handle exceptions, up to 5 extra
times, trying to read the packed-refs file again, until we either read
the new file, or find that the file no longer exists. The limit of 5 is
arbitrary, and provides a safe upper bounds to prevent infinite loops
consuming resources in a potential unforeseen persistent error
condition.
Change-Id: I085c472bafa6e2f32f610a33ddc8368bb4ab1814
Signed-off-by: Martin Fick<mfick@codeaurora.org>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Add a public API to the FileUtils to determine if an IOException is a
stale NFS file handle exception. This will make it easier to detect
such errors, and interpret them consistently throughout the codebase.
This new API is a bit more lenient in its detection than the previous
detection, and should be able to detect some errors which previously
were not identified as stale file handle exceptions because they had the
word NFS in the error message. Adjust the packfile handling code to use
this new API for detection.
Change-Id: I21f80014546ba1afec7335890e5ae79e7f521412
Signed-off-by: Martin Fick<mfick@codeaurora.org>
There should be no functional change, the logic updated only to make
code simple so that compiler can understand what is going for. Removed
all @SuppressWarnings("null") annotations since they cannot be used if
"org.eclipse.jdt.core.compiler.problem.potentialNullReference" option is
set to the "error" level.
Bug: 470647
Change-Id: Ie93c249fa46e792198d362e531d5cbabaf41fdc4
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
Update target platform to Orbit M20150818205559 for Mars in order to
update com.jcraft.jsch to 0.1.53. Also update pom.xml to use Mars target
platform profile by default.
CQ: 10045
Bug: 463580
Change-Id: I1bf151fbee7b00c7bd38cf1236c9bad50e3c64bd
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
- use NIO2's Files.move() to reimplement rename()
- provide a second method accepting CopyOptions which can be used to
request atomic move.
Change-Id: Ibcf722978e65745218a1ccda45344ca295911659
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Root commits are commits with zero parents. If a commmit has no
parents it is the first commit in the repository. In general the root
commits should be unique for any given project, as the first commit
will be created at a different time, by a different user with its own
message. These root commits can be used as a "fingerprint" to
identify disjoint histories.
Change-Id: Id891dbc1f17c816cea404569578bb7635ff85cdb
The FS class and the subclasses FS_POSIX assumed in the findHook()
method that every repository has a valid gitDir. But in tests when using
in-memory-repositories this is not true and this method was generating
NPEs. Change the method to return null if no repository directory can be
determined.
Change-Id: I38a4d36dc6452b5dacae3d0dbf562b569ca3c19b
DfsGarbageCollector asks PackWriter for the set of objects packed
after the bitmap index is written out. This is now null as it was
cleared to release memory. Instead use PackBitmapIndexBuilder to
build the set as it also has the objects.
Reduce memory in PackBitmapIndexBuilder by fully discarding the
ObjectToPack instances. This was the original intent of commit
4bb523475d ("PackWriter: shed memory while creating bitmaps")
but failed as the instances were still held live here.
Switch to BlockList instead of ObjectToPack[]. This allows the
JVM to allocate many smaller arrays instead of one contiguous
array with 5.2M reference pointers. In a tight heap the smaller
allocations are more feasible.
Reduce the initial EWAHCompressedBitmaps for the 4 type maps. On
average a typical repository is 30% commits, 30% trees and 30% blobs.
These bitmaps are typically very dense. PackWriter orders objects by
commit, tree, blob when writing the file so these should always be a
very dense run of 1s with some 0s before and after. So even the 1/3rd
allocation is likely too large, but the later trim() will reduce the
internal buffer anyway.
Change-Id: If0b80a31cb00894f1485ff8f53ef7ae5a759a046
After jgit moved to Java 7 there is no need in an extra
Java7BasicAttributes class. Also all fields of Attributes can be made
final now.
Change-Id: I0be6daf7758189b0eecc4e26294bd278ed8bf7a0
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
Once bitmap creation begins the internal maps required for packing are
no longer necessary. On a repository with 5.2M objects this can save
more than 438 MiB of memory by allowing the ObjectToPack instances to
get garbage collected away.
Downside is the PackWriter cannot be used for any further opertions
except to write the bitmap index. This is an acceptable trade-off as
in practice nobody uses the PackWriter after the bitmaps are built.
Change-Id: Ibfaf84b22fa0590896a398ff659a91fcf03d7128
For construction performance each new EWAHBitmap is allocated at the
roughly worst-case size the bitmap would need if all of the words must
be literal and no run length compression is available. In practice
this is far larger than is required, wasting heap memory while the
bitmaps are computed.
Trim down each bitmap to its minimum required size. This copies the
internal array to a new smaller array, allowing the GC to reclaim the
prior larger array for reuse.
A single bitmap of 5.2M bits is only 79 KiB of memory without this
trim call but 15,000 such bitmaps is 1.1 GiB. Trimming can help fit
a larger number of bitmaps during processing.
Change-Id: I2bd19a786189db5b01c4c96f209b83de50e10c3b
The bitmap preparer only needs commit graph topology; it does not use
the message body. Allow the RevWalk to free the body after the commit
has been parsed to save memory.
Change-Id: I97d4a440c9fc313873fd224bd05b9d9e3dc575db
The WorkingTreeIterator.isEntryIgnored() should use originally requested
file mode while descending to the file tree root and checking ignore
rules. Original code asking isEntryIgnored() on a file was using
directory mode instead if the .gitignore was not located in the same
directory.
Bug: 473506
Change-Id: I9f16ba714c3ea9e6585e9c11623270dbdf4fb1df
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
In addition to honor the http_proxy variable for setting a proxy for
http JGit should also honor the https_proxy variable to set a similar
proxy for https traffic
Bug: 473365
Change-Id: I1002cb575e26cd842bf81ad751ec7c267b585ce2
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
When during Merge for a certain path OURS & BASE contains a file and
THEIRS contains a folder there was a bug in JGit leading to unnecessary
conflicts. This commit fixes it and adds a test for this situation.
Bug: 472693
Change-Id: I71fac5a6a2ef926c01adc266c6f9b3275e870129
Also-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
According to [1] leading spaces are allowed in ignore rules and trailing
spaces are allowed too if they are escaped via backslash.
[1] https://www.kernel.org/pub/software/scm/git/docs/gitignore.html
Bug: 472762
Change-Id: I5e3ae5599cb9e5d80072f38c82c20cbc9475a18a
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
Catch unexpected PatternSyntaxException and convert it to
InvalidPatternException. Log such errors, do not silently ignore them.
Bug: 463581
Change-Id: Id0936d9816769ec0cfae1898beda0f7a3c146e67
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
According to [1] backslash can escape leading special characters '#' and
'!' in ignore rules, so that they are treated literally.
[1] https://www.kernel.org/pub/software/scm/git/docs/gitignore.html
Bug: 463581
Change-Id: I4c02927413a9c63ea5dbf2954877080d902ec1b2
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
While checking if we should consider an ignore rule without '[]'
brackets as a regular expression, check if the backslash escapes one of
the glob special characters '?', '*', '[', '\\'. If not, backslash is
not a part of a regex and should be treated literally.
Bug: 463581
Change-Id: I85208c7f85246fbf6c5029ce3c8b7bb8f4dbd947
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
Rather than lazily parsing the push in this method, parse it at the
end of recvCommands(), which already contains the necessary try/catch
for handling this error. This allows later callers to avoid having to
handle this condition superfluously.
Change-Id: I5dcaf1a44bf4e321adc281e3381e7e17ac89db06
Matthias Sohn
Andrey Loskutov
Martin Fick
Christian Halstrick
Shawn Pearce
Dave Borowitz
Terry Parker
Jonathan Nieder