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Returns a script (string) that reconstructs the state of the
entire database at the time this function is called. The script
language is defined by the backing database engine, which is a
function of server configuration.
Returns None if the database engine does not support dumping to
script or if some other error is encountered in processing.
The SQLite3 implementation in db.py calls iterdump() [1] to generate
a script. iterdump() is the library equivalent of the `sqlite3 .dump`
shell command, and the scripts are compatible. Execute the script in
an empty SQLite3 database using the sqlite3 utility to restore a backup
of prserv.
Use case: Backup a live PR server database in a non-racy way, such
that one could snapshot the entire database after a set of bitbake
builds all using a shared server. I.e. All changes made prior to
the start of a dump_db() operation should be committed and captured
in the script. Subsequent changes made during the backup process are
not guaranteed to be captured.
Testing: ~7MB database backs up in ~1s while PR server is under load
from 32 thread bitbake builds on two separate machines.
[1] https://docs.python.org/2/library/sqlite3.html#sqlite3.Connection.iterdump
Signed-off-by: Haris Okanovic <haris.okanovic@ni.com>
Reviewed-by: Ken Sharp <ken.sharp@ni.com>
Reviewed-by: Bill Pittman <bill.pittman@ni.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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When launching the PR server daemon, the PRData __del__ function was being
called (no reason found yet) where the DB connection closed, thus following
PR updates were not getting into the DB. This patch closes the connection
explicitly, not relaying on the __del__ function execution.
Closing the connection in turn causes all WAL file transactions to be moved
into the database (checkpoint), thus effectively updating the database.
[YOCTO #8215]
Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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I keep having to dig into the archives to remember this information.
Add it as a comment to the file instead.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Ideally, we want the PR service to have minimal influence from
queued disk IO. sqlite tends to be paranoid about data loss and
locks/fsync calls. There is a "WAL mode" which changes the journalling
mechanism and would appear much better suited to our use case.
This patch therefore switches the database to use WAL mode. With this
change, write overhead appears significantly reduced.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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In the commit 'prserv: Ensure data is committed', the PR server moved to
only committing transactions to the database when the PR server is
stopped. This improves performance, but it means that if the machine
running the PR server loses power unexpectedly or if the PR server
process gets SIGKILL, the uncommitted package revision data is lost.
To fix this issue, sync the database periodically, once per 30 seconds
by default, if it has been marked as dirty. To be safe, continue to
sync the database at exit regardless of its status.
Signed-off-by: Ben Shelton <ben.shelton@ni.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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If the power were to fail, it doesn't matter to us much if the data
makes it to disk or not, we'd have other problems. However an fsync()
call on a multi build autobuilder is painful so lets avoid them.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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In exclusive mode, we need to complete the transaction for writes to make
it to the database. Therefore add sync calls to ensure this happens.
Autocommit mode is significantly (100 times) slower so caching the
data is of significant benefit.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Since we don't support using multiple servers on the same database file,
don't use the BEGIN/COMMIT syntax and allow writes to the database
to work ~100 times faster with no transaction locking.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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We only support one server using the database at a time so take an exclusive
lock and avoid later lock overhead.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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If the database is locked we will get an immediate error indicating so,
there is no retry timeout. The looping code is therefore useless, the loop
count is near instantly exceeded.
Using a time based retry means we can wait a sensible time, then gracefully
exit.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Try and avoid errors like "ERROR: database table is locked: PRMAIN_nohist"
by retrying if we see the string "is locked".
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Enabling threading for the PRServer causes a number of issues. Firstly is
the obtuse error:
sqlite3.InterfaceError: Error binding parameter 0 - probably unsupported type
which is due to the class not being derived from object. See:
http://docs.python.org/2/library/sqlite3.html#registering-an-adapter-callable
Secondly, we want to enable multithreadded access to the database so we do this
when we open it. This opens the way up to multithreading the PR server.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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[YOCTO #1126]
A local PR service will be started and stopped automatically along
with the bitbake invocation/ternimation.
This local PR service will be started only and if only when the
PRSERV_HOST is set to 'localhost' and PRSERV_PORT is set to '0'.
When started, the sqlite3 database is stored at
"${PERSISTEN_DIR}/prserv.sqlite3" or "${CACHE}/prserv.sqlite3".
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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[YOCTO #1556]
1. Added the package_arch into the index to the DB table. Because the
change in PACKAGE_ARCH will results in different checksum, and it is
better to have seperate PR value domains for differnt PACKAGE_ARCH of
the same pakcage.
2. Changed the PR service to operate in no history mode. In this mode,
the for a given query tuple (version, pkgarch, checksum), the returned
value will be the largest among all the values of the same (version,
pkgarch). This means the PR value returned can NOT be decremented.
3. Added export function. For each (version, pkgarch) tuple, only the
record with the maximum value will be exported.
4. Added import function. The record will only be imported if the
imported value is larger than the value stored in the DB with the same
(version, pkgarch, checksum) tuple.
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Added the initial implementation of the server side PR service.
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Haris Okanovic
Leonardo Sandoval
Richard Purdie
Ben Shelton
Lianhao Lu