mirrors/jgit - jgit - source @ dussan.org

Petr Hrebejk 2fbbd6d890 Fix PackInvalidException when fetch and repack run concurrently We are running several servers with jGit. We need to run repack from time to time to keep the repos performant. I.e. after push we test how many small packs are in the repo and when a threshold is reached we run the repack. After upgrading jGit version we've found that if someone does the clone at the time repack is running the clone sometimes (not always) fails because the repack removes .pack file used by the clone. Server exception and client error attached. I've tracked down the cause and it seems to be introduced between jGit 5.2 (which we upgraded from) and 5.3 and being caused by this commit: Move throw of PackInvalidException outside the catch - `afef866a44` The problem is that when the throw was inside of the try block the last catch block catched the exception and called openFailed(false) method. It is true that it called it with invalidate = false, which is wrong. The real problem though is that with the throw outside of the try block the openFail is not called at all and the fields activeWindows and activeCopyRawData are not set to 0. Which affects the later called tests like: if (++activeCopyRawData == 1 && activeWindows == 0). The fix for this is relatively simple keeping the throw outside of the try block and still having the invalid field set to true. I did exhaustive testing of the change running concurrent clones and pushes indefinitely and with the patch applied it never fails while without the patch it takes relatively short to get the error. See: https://www.eclipse.org/lists/jgit-dev/msg04014.html Bug: 569349 Change-Id: I9dbf8801c8d3131955ad7124f42b62095d96da54 Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>	3 年前
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eclipse/jgit	Fix PackInvalidException when fetch and repack run concurrently	3 年前

Petr Hrebejk 2fbbd6d890 Fix PackInvalidException when fetch and repack run concurrently

We are running several servers with jGit. We need to run repack from
time to time to keep the repos performant. I.e. after push we test how
many small packs are in the repo and when a threshold is reached we run
the repack.

After upgrading jGit version we've found that if someone does the clone
at the time repack is running the clone sometimes (not always) fails
because the repack removes .pack file used by the clone. Server
exception and client error attached.

I've tracked down the cause and it seems to be introduced between jGit
5.2 (which we upgraded from) and 5.3 and being caused by this commit:
Move throw of PackInvalidException outside the catch -
afef866a44

The problem is that when the throw was inside of the try block the last
catch block catched the exception and called openFailed(false) method.
It is true that it called it with invalidate = false, which is wrong.
The real problem though is that with the throw outside of the try block
the openFail is not called at all and the fields activeWindows and
activeCopyRawData are not set to 0. Which affects the later called tests
like: if (++activeCopyRawData == 1 && activeWindows == 0).

The fix for this is relatively simple keeping the throw outside of the
try block and still having the invalid field set to true. I did
exhaustive testing of the change running concurrent clones and pushes
indefinitely and with the patch applied it never fails while without the
patch it takes relatively short to get the error.

See: https://www.eclipse.org/lists/jgit-dev/msg04014.html

Bug: 569349
Change-Id: I9dbf8801c8d3131955ad7124f42b62095d96da54
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

3 年前

eclipse/jgit Fix PackInvalidException when fetch and repack run concurrently 3 年前