Good point, the network should be faster, so there's a high likelihood it's a concurrency bug.
----- Original message ----- > So... > > On 1 April 2013 21:03, Peter Firmstone <[email protected]> wrote: > > > I understand, better the devil you know argument, if someone wants to make > > a 2.2.1 release, I'm certainly not against it. > > > > > Fair enough. > > > > It won't take me long to track down & fix the concurrency bug, if that's > > the cause. > > I tend to agree with Greg's assessment that the tests are contrived. The > > tests make a poor attempt at determining whether the leased resource is > > still available by checking within a time window around lease expiry, it's > > subject to so many assumptions that I can't see why that determination is > > even made. > > > > Well they seem contrived but given the size of the lease times we're > dealing with and the room between them for clean expiry, I'm a little > concerned. No question, they aren't the best tests, crude for sure, but > they don't look broke as such. I'll keep looking... > > > > I don't think we can guarantee a lease will expire during a specific time > > window, most programmers will hopefully renew a lease long before it's due > > to expire. Until we make that assessment, I think we'll struggle with the > > tests. > > > > > I think the point is a lease should expire exactly to the millisecond. What > you can't guarantee is when an event gets issued against the leased object, > before of after. Nevertheless with big enough windows before expiry, it > should work so... > > > > Remember were now dealing with concurrency over network connections. The > > so called failures may just be due to timing. > > > > The network is asynchronous. > > > > > Yep, preaching to the converted. > > > > The old code appears to slow down network connections enough to make them > > less asynchronous, heck even really bad concurrency race conditions and > > obvious bugs didn't manifest during testing. > > > > > Mmmm, see my gut says that if the network is "faster" these tests should be > less likely to fail as it's more likely events are delivered in the > time-frames required, not less. > > > > Example of how old code makes network less asynchronous: > > > > 1. Thread runs, opens network connection, security check is performed. > > 2. Second thread runs, opens network connection, security check is > > performed, first thread is synchronized on a DNS check, the second > > thread waits. > > 3. Second thread will complete after first. > > > > New code: > > > > 1. Thread runs, opens network connection, security check is performed > > and returns without contention. > > 2. Second thread runs opens network connection, security check is > > performed and returns without contention. > > 3. Second thread by chance finishes communication prior to first. > > > > If we look at ClassLoader, the story is similar. > > > > Regards, > > > > Peter. > > > > Dan Creswell wrote: > > > > > I feel Bryan has a point. > > > > > > Putting out a release with just the Levels fix is better than the current > > > release which won't run at all under various circumstances. i.e. It is a > > > small step forward and in no way a backward step. > > > > > > Such a release mightn't be as much of a step forward as one also > > > featuring the concurrency work *but* the concurrency work is also > > > seemingly > > > amplifying the occurrence of preexisting concurrency problems. It can be > > > said then to perform both better and worse than previous releases. > > > > > > In essence, the small fix release is a known quantity, the new one less > > > so. We maybe ought to give users the choice as to how much unknown'ness > > > they wish to indulge in. > > > > > > > > > > > > > > > On 1 April 2013 13:10, Peter <[email protected] <mailto:[email protected]>> > > > wrote: > > > > > > The big problem is there are less concurrency bugs in the present > > > branch and there are definitely more in the previous release, they > > > just haven't presented in test in previous releases, although they > > > have in deployment. > > > > > > The issue appears to be with javaspaces / lease / transactions. > > > > > > It's also a possibility that there's just a timing issue with the > > > tests. > > > > > > I'd like to fix the tests before releasing, it's unfortunate the > > > last fix to jeri seemed to expose these new test failures. It's a > > > little like fixing rust in an old car, the more you remove, the > > > more you find. > > > > > > What I really need is more help, I don't work on this full time it > > > takes longer than a team woking on commercial software. > > > > > > Peter. > > > ----- Original message ----- > > > > I am uncomfortable with a release that has known concurrency > > > problems. I > > > > am also uncomfortable that the custom Levels serialization > > >change by > > > > Oracle [1] has broken the current release for new JVMs. I would > > > like to > > > > see a minor release which fixes that serialization problem and a > > > candidate > > > > release which gives people a chance to discovery concurrent > > > issues without > > > > risking a release that is known to be unstable. > > > > > > > > I'm happy to review a few of the classes with known concurrency > > > problems > > > > to see if I can help nail some of these bugs. Since I do not > > > know the > > > > river internals, I would only be able to spot concurrency > > > problems that > > > > exist within a class. I am not in a good position to comment on > > > > concurrency problems that might arise through the interactions > > >among > > > > classes. > > > > > > > > Bryan > > > > > > > > [1] > > > https://issues.apache.org/**jira/browse/RIVER-416<https://issues.apache.org/jira/browse/RIVER-416> > > > > > On 4/1/13 6:14 AM, "Peter Firmstone" <[email protected] > > > <mailto:[email protected]>> wrote: > > > > > > > > > The attachments will be removed from the list, so I've cc'd > > > you, anyone > > > > > who's interested, let me know I can forward the attachments. > > > They can > > > > > be opened with jvisualvm. > > > > > > > > > > The profiling isn't perfect, the test runs for about 8.5 > > > minutes, so > > > > > hotspot should have kicked in relatively early in both test > > >runs. > > > > > > > > > > I guess a significant problem is; the more I remove performance > > > > > impedances, like unnecessary DNS calls, the faster > > > multithreading and > > > > > context switching gets. > > > > > > > > > > Not only did the old policy providers create contention, but > > > it was > > > > > slower for single threaded performance (I'll have to run the > > > previous > > > > > release branch for comparison when I get some time). > > > > > > > > > > The URIGrant.implies call is now down to .228 ms per > > > invocation, down > > > > > from 1.68 ms per invocation this week, which was already quite > > > good (on > > > > > old UltraSparcII hardware), during stress tests this method is > > > called > > > > > almost 40,000 times. > > > > > > > > > > In comparison the old policy provider which required a DNS > > > call (every > > > > > time CodeSource.implies is called, functionality now replaced > > >by > > > > > URIGrant.implies), the old policy provider also cached all > > > Permission's > > > > > in highly contended PermissionCollection's, which during > > > network calls > > > > > invoked SocketPermission.implies, possibly for every > > > SocketPermission in > > > > > the PermissionCollection, DNS is also consulted by > > > > > SocketPermission.implies, while synchronized, ouch! > > > > > > > > > > URIGrant.implies is non blocking, that's right zero contention. > > > > > SocketPermission.implies DNS calls can be avoided in most > > >cases if > > > > > PermissionComparator finds an exact match or wild card. > > > > > > > > > > This is without the CombinerSecurityManager, which improves > > > security > > > > > performance by a factor of 10 (SocketPermission is only > > > checked once for > > > > > each AccessControlContext). > > > > > > > > > > PreferredClassProvider no longer creates unecessary DNS calls, > > >and > > > > > neither does SecureClassLoader, URLClassLoader or > > > PreferredClassLoader. > > > > > > > > > > So the good news is the next release will feel much faster, > > > the bad news > > > > > is that existing concurrency bugs that previously didn't > > > appear during > > > > > test runs, but likely to manifest during production are now > > > occurring > > > > > during testing. There's more good news, we fixed a number of > > > > > concurrency bugs since the last release too, I guess I have to > > > draw the > > > > > line somewhere and cut a release. > > > > > > > > > > DNS calls haven't been completely eliminated as some are still > > > > > necessary, but a multitude of unnecessary DNS calls have been > > > eliminated. > > > > > > > > > > Regards, > > > > > > > > > > Peter. > > > > > > > > > > Peter Firmstone wrote: > > > > > > They've passed more consistently in the past, they're either > > > > > > concurrency bugs or network timing related, it would be nice > > > to at > > > > > > least determine if it's the former or latter. > > > > > > > > > > > > Cheers, > > > > > > > > > > > > Peter. > > > > > > > > > > > > Tom Hobbs wrote: > > > > > > > Are these all new failures, i.e. were they working > > > before? Or are they > > > > > > > "new" failures in that the test categories have only > > > recently been > > > > > > > reactivated and the failures discovered? > > > > > > > > > > > > > > Are they a big enough blocker to stop a release? > > > > > > > > > > > > > > > > > > > > > On Sun, Mar 31, 2013 at 11:31 PM, Peter Firmstone > > > <[email protected] <mailto:[email protected]>> > > > > > > > > > > wrote: > > > > > > > > > > > > > > > > > > > > > > The following test fails 30 times in a run of 130 tests: > > > > > > > > > > > > > > > > [java] # of tests > > > passed = > > > 1 > > > > > > > > [java] # of tests > > > passed = > > > 0 > > > > > > > > [java] # of tests > > > passed = > > > 1 > > > > > > > > [java] # of tests > > > passed = > > > 1 > > > > > > > > [java] # of tests > > > passed = > > > 1 > > > > > > > > [java] # of tests > > > passed = > > > 0 > > > > > > > > [java] # of tests > > > passed = > > > 1 > > > > > > > > [java] # of tests > > > passed = > > > 1 > > > > > > > > [java] # 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> > > > > > > > > > > > > > > > > > > > 100 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Buildfile: build.xml > > > > > > > > > > > > > > > > qa.run-tests: > > > > > > > > > > > > > > > > james-brown: > > > > > > > > [delete] Deleting directory /opt/src/River_Fixed/** > > > > > > > > peterConcurrentPolicy/qa/soul > > > > > > > > [mkdir] Created dir: /opt/src/River_Fixed/** > > > > > > > > peterConcurrentPolicy/qa/soul > > > > > > > > [touch] Creating > > > > > > > > > > >/opt/src/River_Fixed/****peterConcurrentPolicy/qa/soul/*** > > > > > > > > *soul.201303312239034808 > > > > > > > > > > > > > > > > run-tests: > > > > > > > > [java] > > > > > > > > [java] > > >------------------------------****----------- > > > > > > > > [java] CONFIGURATION FILE: > > > > > > > > [java] > > > > > > > > [java] > > >/opt/src/River_Fixed/**** > > > peterConcurrentPolicy/qa/src/**** > > > > > > > > com/sun/jini/test/resources/****qaHarness.prop > > > > > > > > [java] > > > > > > > > [java] > > >------------------------------****----------- > > > > > > > > [java] SETTING UP THE TEST LIST: > > > > > > > > [java] > > > > > > > > [java] Adding test: > > > > > > > > com/sun/jini/test/spec/****javaspace/conformance/ > > > > > > > > **snapshot/****SnapshotExpirationNotifyTest.****td > > > > > > > > [java] > > > > > > > > [java] > > >------------------------------****----------- > > > > > > > > [java] GENERAL HARNESS CONFIGURATION > > >INFORMATION: > > > > > > > > [java] > > > > > > > > [java] Date started: > > > > > > > > [java] Sun Mar 31 > > >22:39:37 EST 2013 > > > > > > > > [java] Installation directory of > > >the JSK: > > > > > > > > [java] > > >com.sun.jini.jsk.home=/opt/**** > > > src/River_Fixed/** > > > > > > > > peterConcurrentPolicy > > > > > > > > [java] Installation directory of > > >the harness: > > > > > > > > [java] > > >com.sun.jini.qa.home=/opt/src/* > > > ***River_Fixed/** > > > > > > > > peterConcurrentPolicy/qa > > > > > > > > [java] Categories being tested: > > > > > > > > [java] categories=No > > >Categories > > > > > > > > [java] > > >------------------------------****----------- > > > > > > > > [java] ENVIRONMENT PROPERTIES: > > > > > > > > [java] > > > > > > > > [java] JVM information: > > > > > > > > [java] Java > > >HotSpot(TM) Server VM, > > > 20.5-b03, 32 bit VM mode > > > > > > > > [java] Sun > > >Microsystems Inc. > > > > > > > > [java] OS information: > > > > > > > > [java] SunOS, 5.10, > > >sparc > > > > > > > > [java] > > > > > > > > [java] > > >------------------------------****----------- > > > > > > > > [java] STARTING TO RUN THE TESTS > > > > > > > > [java] > > > > > > > > [java] > > > > > > > > [java] Running > > > com/sun/jini/test/spec/****javaspace/conformance/** > > > > > > > > snapshot/****SnapshotExpirationNotifyTest.****td > > > > > > > > [java] Time is Sun Mar 31 22:39:38 EST 2013 > > > > > > > > [java] Starting test in separate process > > >with > > > command: > > > > > > > > [java] /usr/jdk/jdk1.6.0_30/jre/bin/****java > > > > > > > > > > > > > > > > > > > -Djava.security.manager=org.****apache.river.api.security.**** > > > CombinerSecur > > > > > > > > ityManager > > > > > > > > > > > > > > > > -Djava.security.policy=file:/****opt/src/River_Fixed/** > > > > > > > > > > > peterConcurrentPolicy/qa/****harness/policy/defaulttest.****policy > > > > > > > > > > > > > > > > > > > -Djava.rmi.server.codebase=**htt**p://bluto:9082/qa1-** > > > javaspace-**dl.jar<h > > > > > > > > ttp://bluto:9082/qa1-**javaspace-dl.jar>-cp > > > > > > > > /opt/src/River_Fixed/ > > > > > > > > > > > > > > > > > > > **peterConcurrentPolicy/qa/**lib/**jiniharness.jar:/opt/** > > > src/**River_Fixed > > > > > > > > /** > > > > > > > > > > > > > > > > > > > peterConcurrentPolicy/qa/lib/****jinitests.jar:/opt/src/River_**** > > > > > > > > > > > > > > > > > > > Fixed/peterConcurrentPolicy/****lib/jsk-platform.jar:/opt/src/** > > > **River_Fix > > > > > > > > ed/ > > > > > > > > > > > > > > > > > > > > > >**peterConcurrentPolicy/lib/**jsk-**lib.jar:/opt/src/River_**Fixed/** > > > > > > > > > > > > > > > > > > > peterConcurrentPolicy/lib/****high-scale-lib.jar:/opt/src/**** > > > River_Fixed/* > > > > > > > > * > > > > > > > > > > > > > > > > peterConcurrentPolicy/lib/****custard-apple-1.0.2.jar -ea > > > -esa -client > > > > > > > > > > > -Djava.ext.dirs=/usr/jdk/jdk1.****6.0_30/jre/lib/ext:/usr/jdk/**** > > > > > > > > > > > > > > > > > > > packages/lib/ext:/opt/src/****River_Fixed/**** > > > peterConcurrentPolicy/qa/lib- > > > > > > > > ** > > > > > > > > > > > > > > > > > > >ext:/opt/src/River_Fixed/****peterConcurrentPolicy/lib-ext > > > > > > > > -Dcom.sun.jini.jsk.port=9080 -Dcom.sun.jini.qa.port=9081 > > > > > > > > > > > -Dcom.sun.jini.jsk.home=/opt/****src/River_Fixed/**** > > > peterConcurrentPolicy > > > > > > > > > > > > > > > > > > > -Dcom.sun.jini.qa.home=/opt/****src/River_Fixed/**** > > > peterConcurrentPolicy/q > > > > > > > > a > > > > > > > > > > > > > > > > > > >-Dcom.sun.jini.qa.harness.****harnessJar=/opt/src/River_** > > > > > > > > Fixed/peterConcurrentPolicy/****qa/lib/jiniharness.jar > > > > > > > > -Dcom.sun.jini.qa.harness.**** > > > testJar=/opt/src/River_Fixed/**** > > > > > > > > peterConcurrentPolicy/qa/lib/****jinitests.jar > > > > > > > > -Dcom.sun.jini.qa.harness.****runjiniserver=true > > > > > > > > -Dcom.sun.jini.qa.harness.****runkitserver=true > > > > > > > > -Djava.security.properties=* > > > > > > > > > > >*file:/opt/src/River_Fixed/****peterConcurrentPolicy/qa/** > > > > > > > > harness/trust/dynamic-policy.****properties > > > > > > > > -Dcom.sun.jini.qa.harness.****testhosts= > > > > > > > > > > > -Djava.util.logging.config.****file=/home/peter/logging.**** > > > properties > > > > > > > > > > > > > > > > > > > -Dcom.sun.jini.test.home=/opt/****src/River_Fixed/**** > > > peterConcurrentPolicy > > > > > > > > /qa > > > > > > > > > > > > > > > > -Dcom.sun.jini.test.port=9082 > > >-Dcom.sun.jini.qa.harness.** > > > > > > > > > > > policies=file:/opt/src/River_****Fixed/peterConcurrentPolicy/**** > > > > > > > > qa/src/com/sun/jini/test/****resources/jinitest.policy > > > > > > > > > > > -Djava.ext.dirs=/usr/jdk/jdk1.****6.0_30/jre/lib/ext:/usr/jdk/**** > > > > > > > > > > > > > > > > > > > packages/lib/ext:/opt/src/****River_Fixed/**** > > > peterConcurrentPolicy/qa/lib- > > > > > > > > ** > > > > > > > > > > > > > > > > > > >ext:/opt/src/River_Fixed/****peterConcurrentPolicy/lib-ext > > > > > > > > com.sun.jini.qa.harness.****MasterTest > > > com/sun/jini/test/spec/** > > > > > > > > > > > > > >javaspace/conformance/****snapshot/****SnapshotExpirationNotifyTest.* > > > ***td > > > > > > > > [java] > > >com.sun.jini.qa.harness.****TestException: > > > Not all > > > > > > > > listeners've > > > > > > > > got expected number of events. > > > > > > > > [java] at > > > com.sun.jini.test.spec.****javaspace.conformance.** > > > > > > > > snapshot.****SnapshotExpirationNotifyTest.****run(** > > > > > > > > SnapshotExpirationNotifyTest.****java:370) > > > > > > > > [java] at > > > > > > > > > > >com.sun.jini.qa.harness.****MasterTest.doTest(MasterTest.* > > > > > > > > *java:256) > > > > > > > > [java] at > > > > > > > > com.sun.jini.qa.harness.****MasterTest.main(MasterTest.** > > > > > > > > java:144) > > > > > > > > [java] > > > > > > > > [java] TIME: 10:42:54 PM > > > > > > > > [java] > > > > > > > > [java] Test process was destroyed and > > >returned code 1 > > > > > > > > [java] > > > > > > > > com/sun/jini/test/spec/****javaspace/conformance/**** > > > snapshot/** > > > > > > > > SnapshotExpirationNotifyTest.****td > > > > > > > > [java] Test Failed: Test Failed: > > > > > > > > com.sun.jini.qa.harness.****TestException: > > > > > > > > Not all listeners've got expected number of events. > > > > > > > > [java] > > > > > > > > [java] > > > > > > > > [java] > > >------------------------------****----------- > > > > > > > > [java] > > > > > > > > [java] SUMMARY > > >==============================****=== > > > > > > > > [java] > > > > > > > > [java] > > > > > > > > com/sun/jini/test/spec/****javaspace/conformance/**** > > > snapshot/** > > > > > > > > SnapshotExpirationNotifyTest.****td > > > > > > > > [java] Test Failed: Test Failed: > > > > > > > > com.sun.jini.qa.harness.****TestException: > > > > > > > > Not all listeners've got expected number of events. > > > > > > > > [java] > > > > > > > > [java] > > >------------------------------****----------- > > > > > > > > [java] > > > > > > > > [java] # of tests started = 1 > > > > > > > > [java] # of tests completed = 1 > > > > > > > > [java] # of tests passed = 0 > > > > > > > > [java] # of tests failed = 1 > > > > > > > > [java] > > > > > > > > [java] > > >------------------------------****----------- > > > > > > > > [java] > > > > > > > > [java] Date finished: > > > > > > > > [java] Sun Mar 31 > > >22:42:59 EST 2013 > > > > > > > > [java] Time elapsed: > > > > > > > > [java] 201 seconds > > > > > > > > [java] > > > > > > > > [java] Java Result: 1 > > > > > > > > > > > > > > > > collect-result: > > > > > > > > > > > > > > > > BUILD FAILED > > > > > > > > > > > /opt/src/River_Fixed/****peterConcurrentPolicy/build.****xml:2105: > > > The > > > > > > > > following error occurred while executing this line: > > > > > > > > > > > > > >/opt/src/River_Fixed/****peterConcurrentPolicy/qa/****build.xml:357: > > > > > > > > condition satisfied > > > > > > > > > > > > > > > > Total time: 3 minutes 30 seconds > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
