[JENKINS] Lucene-Solr-master-Linux (64bit/jdk-9.0.1) - Build # 20846 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-Linux/20846/ Java: 64bit/jdk-9.0.1 -XX:+UseCompressedOops -XX:+UseConcMarkSweepGC 1 tests failed. FAILED: org.apache.solr.cloud.TestSSLRandomization.testRandomizedSslAndClientAuth Error Message: There are still nodes recoverying -

[JENKINS] Lucene-Solr-7.x-Windows (64bit/jdk1.8.0_144) - Build # 290 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Windows/290/ Java: 64bit/jdk1.8.0_144 -XX:-UseCompressedOops -XX:+UseSerialGC 2 tests failed. FAILED: junit.framework.TestSuite.org.apache.lucene.search.highlight.TokenSourcesTest Error Message: Could not remove the following files (in the

[JENKINS] Lucene-Solr-7.x-Linux (64bit/jdk-9.0.1) - Build # 754 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Linux/754/ Java: 64bit/jdk-9.0.1 -XX:-UseCompressedOops -XX:+UseSerialGC 3 tests failed. FAILED: org.apache.solr.cloud.CreateCollectionCleanupTest.testCreateCollectionCleanup Error Message: Error from server at

[JENKINS] Lucene-Solr-master-Linux (64bit/jdk-9.0.1) - Build # 20845 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-Linux/20845/ Java: 64bit/jdk-9.0.1 -XX:-UseCompressedOops -XX:+UseG1GC 1 tests failed. FAILED: junit.framework.TestSuite.org.apache.solr.analytics.facet.RangeFacetTest Error Message: Could not find collection:collection1 Stack Trace:

[JENKINS] Lucene-Solr-master-Windows (64bit/jdk-9.0.1) - Build # 7002 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-Windows/7002/ Java: 64bit/jdk-9.0.1 -XX:-UseCompressedOops -XX:+UseG1GC 6 tests failed. FAILED: junit.framework.TestSuite.org.apache.solr.cloud.TestZkChroot Error Message: Could not remove the following files (in the order of attempts):

[JENKINS] Lucene-Solr-SmokeRelease-master - Build # 881 - Still Failing

2017-11-05 Thread Apache Jenkins Server
Build: https://builds.apache.org/job/Lucene-Solr-SmokeRelease-master/881/ No tests ran. Build Log: [...truncated 28006 lines...] prepare-release-no-sign: [mkdir] Created dir: /x1/jenkins/jenkins-slave/workspace/Lucene-Solr-SmokeRelease-master/lucene/build/smokeTestRelease/dist [copy]

[jira] [Commented] (LUCENE-8034) SpanNotWeight returns wrong results due to integer overflow

2017-11-05 Thread Robert Muir (JIRA)
[ https://issues.apache.org/jira/browse/LUCENE-8034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16239839#comment-16239839 ] Robert Muir commented on LUCENE-8034: - I think you are right, I was just confused by the test. Maybe

[jira] [Comment Edited] (LUCENE-8034) SpanNotWeight returns wrong results due to integer overflow

2017-11-05 Thread Hari Menon (JIRA)
[ https://issues.apache.org/jira/browse/LUCENE-8034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16239836#comment-16239836 ] Hari Menon edited comment on LUCENE-8034 at 11/6/17 2:38 AM: - [~mikemccand]

[jira] [Commented] (LUCENE-8034) SpanNotWeight returns wrong results due to integer overflow

2017-11-05 Thread Hari Menon (JIRA)
[ https://issues.apache.org/jira/browse/LUCENE-8034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16239836#comment-16239836 ] Hari Menon commented on LUCENE-8034: [~mikemccand] That's a good question, and actually something I

[JENKINS] Lucene-Solr-7.x-Solaris (64bit/jdk1.8.0) - Build # 284 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Solaris/284/ Java: 64bit/jdk1.8.0 -XX:+UseCompressedOops -XX:+UseConcMarkSweepGC 1 tests failed. FAILED: org.apache.solr.util.UtilsToolTest.testRelativePath Error Message: expected:<14> but was:<15> Stack Trace: java.lang.AssertionError:

[JENKINS] Lucene-Solr-7.x-Linux (64bit/jdk1.8.0_144) - Build # 753 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Linux/753/ Java: 64bit/jdk1.8.0_144 -XX:-UseCompressedOops -XX:+UseParallelGC 1 tests failed. FAILED: org.apache.solr.cloud.autoscaling.AutoAddReplicasPlanActionTest.testSimple Error Message: No live SolrServers available to handle this

[jira] [Commented] (LUCENE-8034) SpanNotWeight returns wrong results due to integer overflow

2017-11-05 Thread Robert Muir (JIRA)
[ https://issues.apache.org/jira/browse/LUCENE-8034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16239792#comment-16239792 ] Robert Muir commented on LUCENE-8034: - It currently causes scores to go negative without the fix?

[jira] [Commented] (LUCENE-8034) SpanNotWeight returns wrong results due to integer overflow

2017-11-05 Thread Michael McCandless (JIRA)
[ https://issues.apache.org/jira/browse/LUCENE-8034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16239791#comment-16239791 ] Michael McCandless commented on LUCENE-8034: Patch looks good; I'll commit soon. Thanks

Re: Debugging JVM security manager issues with Lucene's tests

2017-11-05 Thread Robert Muir
Something about "stack" makes junit4 mad. try -Dargs="-Djava.security.debug=access,failure" instead: that still gives stacktrace on failures, which is usually what you want, and works fine. If its not enough, -Dargs="-Djava.security.debug=all" seems to work just fine with the junit runner too,

[JENKINS-EA] Lucene-Solr-master-Linux (64bit/jdk-10-ea+29) - Build # 20844 - Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-Linux/20844/ Java: 64bit/jdk-10-ea+29 -XX:+UseCompressedOops -XX:+UseSerialGC 4 tests failed. FAILED: junit.framework.TestSuite.org.apache.solr.client.solrj.request.TestV2Request Error Message: 1 thread leaked from SUITE scope at

Debugging JVM security manager issues with Lucene's tests

2017-11-05 Thread Michael McCandless
I'm trying to understand why the JVM security manager is preventing Lucene from finding all codecs ... and I thought I could e.g. run this: ant test -Dargs="-Djava.security.debug=access,failure,stack" -Dtestcase=TestIndexWriter That property tells the security manager to dump the stack when

[JENKINS] Lucene-Solr-7.x-Linux (64bit/jdk1.8.0_144) - Build # 752 - Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Linux/752/ Java: 64bit/jdk1.8.0_144 -XX:+UseCompressedOops -XX:+UseG1GC 2 tests failed. FAILED: org.apache.solr.cloud.LeaderFailoverAfterPartitionTest.test Error Message: Expected 2 of 3 replicas to be active but only found 1;

[JENKINS-MAVEN] Lucene-Solr-Maven-master #2129: POMs out of sync

2017-11-05 Thread Apache Jenkins Server
Build: https://builds.apache.org/job/Lucene-Solr-Maven-master/2129/ No tests ran. Build Log: [...truncated 19385 lines...] [mvn] [INFO] - [mvn] [INFO] - [mvn]

[JENKINS] Lucene-Solr-NightlyTests-master - Build # 1414 - Still unstable

2017-11-05 Thread Apache Jenkins Server
Build: https://builds.apache.org/job/Lucene-Solr-NightlyTests-master/1414/ 3 tests failed. FAILED: org.apache.solr.cloud.ChaosMonkeySafeLeaderTest.test Error Message: The Monkey ran for over 45 seconds and no jetties were stopped - this is worth investigating! Stack Trace:

[jira] [Updated] (SOLR-11608) V2 Core-Rename API fails to parse new core name

2017-11-05 Thread Jason Gerlowski (JIRA)
[ https://issues.apache.org/jira/browse/SOLR-11608?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jason Gerlowski updated SOLR-11608: --- Attachment: SOLR-11608.patch Attached a 1-line fix which adds the missing mapping to

[JENKINS] Lucene-Solr-Tests-7.x - Build # 225 - Still Unstable

2017-11-05 Thread Apache Jenkins Server
Build: https://builds.apache.org/job/Lucene-Solr-Tests-7.x/225/ 16 tests failed. FAILED: org.apache.solr.cloud.AliasIntegrationTest.test Error Message: Collection not found: testalias2 Stack Trace: org.apache.solr.common.SolrException: Collection not found: testalias2 at

[JENKINS] Lucene-Solr-master-MacOSX (64bit/jdk1.8.0) - Build # 4272 - Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-MacOSX/4272/ Java: 64bit/jdk1.8.0 -XX:-UseCompressedOops -XX:+UseSerialGC 3 tests failed. FAILED: junit.framework.TestSuite.org.apache.solr.cloud.TestTolerantUpdateProcessorRandomCloud Error Message: Could not find collection:test_col

[jira] [Updated] (SOLR-11609) Add randomWalk Stream Evaluator to support time series simulations

2017-11-05 Thread Joel Bernstein (JIRA)
[ https://issues.apache.org/jira/browse/SOLR-11609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Joel Bernstein updated SOLR-11609: -- Description: Now that we have *Monte Carlo* simulations and *Markov Chain* support it would be

[jira] [Updated] (SOLR-11609) Add randomWalk Stream Evaluator to support time series simulations

2017-11-05 Thread Joel Bernstein (JIRA)
[ https://issues.apache.org/jira/browse/SOLR-11609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Joel Bernstein updated SOLR-11609: -- Description: Now that we have Monte Carlo simulations and Markov chain support it would be

[jira] [Updated] (SOLR-11609) Add randomWalk Stream Evaluator to support time series simulations

2017-11-05 Thread Joel Bernstein (JIRA)
[ https://issues.apache.org/jira/browse/SOLR-11609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Joel Bernstein updated SOLR-11609: -- Fix Version/s: 7.2 > Add randomWalk Stream Evaluator to support time series simulations >

[jira] [Created] (SOLR-11609) Add randomWalk Stream Evaluator to support time series simulations

2017-11-05 Thread Joel Bernstein (JIRA)
Joel Bernstein created SOLR-11609: - Summary: Add randomWalk Stream Evaluator to support time series simulations Key: SOLR-11609 URL: https://issues.apache.org/jira/browse/SOLR-11609 Project: Solr

[jira] [Assigned] (SOLR-11609) Add randomWalk Stream Evaluator to support time series simulations

2017-11-05 Thread Joel Bernstein (JIRA)
[ https://issues.apache.org/jira/browse/SOLR-11609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Joel Bernstein reassigned SOLR-11609: - Assignee: Joel Bernstein > Add randomWalk Stream Evaluator to support time series

[JENKINS] Lucene-Solr-7.x-Windows (64bit/jdk1.8.0_144) - Build # 289 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Windows/289/ Java: 64bit/jdk1.8.0_144 -XX:-UseCompressedOops -XX:+UseG1GC 5 tests failed. FAILED: junit.framework.TestSuite.org.apache.lucene.store.TestHardLinkCopyDirectoryWrapper Error Message: Could not remove the following files (in

[jira] [Updated] (SOLR-11608) V2 Core-Rename API fails to parse new core name

2017-11-05 Thread Jason Gerlowski (JIRA)
[ https://issues.apache.org/jira/browse/SOLR-11608?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jason Gerlowski updated SOLR-11608: --- Attachment: repro.sh Trivial script reproducing the issue on Linux. > V2 Core-Rename API

[jira] [Created] (SOLR-11608) V2 Core-Rename API fails to parse new core name

2017-11-05 Thread Jason Gerlowski (JIRA)
Jason Gerlowski created SOLR-11608: -- Summary: V2 Core-Rename API fails to parse new core name Key: SOLR-11608 URL: https://issues.apache.org/jira/browse/SOLR-11608 Project: Solr Issue Type:

[jira] [Commented] (LUCENE-7863) Don't repeat postings (and perhaps positions) on ReverseWF, EdgeNGram, etc

2017-11-05 Thread Mikhail Khludnev (JIRA)
[ https://issues.apache.org/jira/browse/LUCENE-7863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16239673#comment-16239673 ] Mikhail Khludnev commented on LUCENE-7863: -- h2. Question What I can use to write ints

[jira] [Updated] (LUCENE-7863) Don't repeat postings (and perhaps positions) on ReverseWF, EdgeNGram, etc

2017-11-05 Thread Mikhail Khludnev (JIRA)
[ https://issues.apache.org/jira/browse/LUCENE-7863?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Mikhail Khludnev updated LUCENE-7863: - Attachment: byterefshash-bench.txt LUCENE-7863.patch

Re: Starting with Apache Lucene

2017-11-05 Thread Alexandre Rafalovitch
I have a couple. After a while you get the feel for your own. So, here is a couple of basic examples: 1.1) I created a saved filter called "All open Solr issues": project = SOLR AND status in (Open, "In Progress", Reopened) 1.2) I created a dashboard widget with HeatMap type, using that filter as

[JENKINS] Lucene-Solr-master-Linux (64bit/jdk-9.0.1) - Build # 20842 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-Linux/20842/ Java: 64bit/jdk-9.0.1 -XX:-UseCompressedOops -XX:+UseSerialGC 2 tests failed. FAILED: org.apache.lucene.search.similarities.TestBasicModelIn.testRandomScoring Error Message: score(6.1112838E8)=3.84374963E9 >

Re: Starting with Apache Lucene

2017-11-05 Thread manish kakoti
Hi Alexandre, Thank you for your valuable suggestion, Yes that is definitely a great starting point. It would very helpful if you can add the link for the old JIRA issues that you have mentioned. Regards Manish Kakoti On Sun, Nov 5, 2017 at 11:01 PM, Alexandre Rafalovitch

Re: Starting with Apache Lucene

2017-11-05 Thread Alexandre Rafalovitch
Two things I want to add that I swore were in the guide, but can't easily see them. The first is triaging old JIRA issues. It is very valuable to be able to pick up old JIRA issues (opened against Solr 1.x, 2.x, 3.x, 4.x or even 5.x) and testing them against the latest release to see if the issue

[JENKINS] Lucene-Solr-master-Windows (32bit/jdk1.8.0_144) - Build # 7001 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-Windows/7001/ Java: 32bit/jdk1.8.0_144 -server -XX:+UseSerialGC 4 tests failed. FAILED: junit.framework.TestSuite.org.apache.lucene.codecs.blockterms.TestFixedGapPostingsFormat Error Message: Could not remove the following files (in the

[JENKINS-EA] Lucene-Solr-7.x-Linux (64bit/jdk-10-ea+29) - Build # 750 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Linux/750/ Java: 64bit/jdk-10-ea+29 -XX:-UseCompressedOops -XX:+UseG1GC 2 tests failed. FAILED: org.apache.solr.cloud.LeaderFailoverAfterPartitionTest.test Error Message: Expected 2 of 3 replicas to be active but only found 1;

Re: Starting with Apache Lucene

2017-11-05 Thread manish kakoti
thanks, Shawn Heisey On Sun, Nov 5, 2017 at 8:51 PM, Shawn Heisey wrote: > On 11/4/2017 4:38 AM, manish kakoti wrote: > >> I am new to Lucene, and i am really interested to contribute to it.How >> do i actually get started with it? >> Could use some suggestions and support

Re: Starting with Apache Lucene

2017-11-05 Thread Shawn Heisey
On 11/4/2017 4:38 AM, manish kakoti wrote: I am  new to Lucene, and i am really interested to contribute to it.How do i actually get started with it? Could use some suggestions and support in order to get started with it. +1 to Erick's reply on the thread. He covers the topic pretty well.

[JENKINS] Lucene-Solr-master-Linux (64bit/jdk-9.0.1) - Build # 20841 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-Linux/20841/ Java: 64bit/jdk-9.0.1 -XX:+UseCompressedOops -XX:+UseParallelGC 2 tests failed. FAILED: org.apache.solr.cloud.autoscaling.AutoAddReplicasIntegrationTest.testSimple Error Message: Waiting for collection testSimple2 null Live

[JENKINS] Lucene-Solr-7.x-Solaris (64bit/jdk1.8.0) - Build # 283 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Solaris/283/ Java: 64bit/jdk1.8.0 -XX:+UseCompressedOops -XX:+UseConcMarkSweepGC 3 tests failed. FAILED: org.apache.solr.cloud.LeaderInitiatedRecoveryOnCommitTest.test Error Message: Timeout occured while waiting response from server at:

[JENKINS] Lucene-Solr-7.x-Linux (64bit/jdk-9.0.1) - Build # 749 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Linux/749/ Java: 64bit/jdk-9.0.1 -XX:+UseCompressedOops -XX:+UseG1GC 3 tests failed. FAILED: junit.framework.TestSuite.org.apache.solr.handler.component.DistributedQueryComponentOptimizationTest Error Message: Stack Trace:

[JENKINS] Lucene-Solr-master-Linux (64bit/jdk1.8.0_144) - Build # 20840 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-Linux/20840/ Java: 64bit/jdk1.8.0_144 -XX:+UseCompressedOops -XX:+UseParallelGC 3 tests failed. FAILED: org.apache.solr.cloud.CollectionStateFormat2Test.testZkNodeLocation Error Message: Error from server at http://127.0.0.1:33571/solr:

RE: JDK 10 b29 Early Access is available on jdk.java.net

2017-11-05 Thread Uwe Schindler
Hi Rory, hi all, after adding a call to a new „assumeWorkingMockito()“ to Solr’s tests that use Mockito (see https://issues.apache.org/jira/browse/SOLR-11606) all of our tests pass as they did with Java 9. No further problems with JDK 10. The new versioning scheme as proposed by Mark is

[JENKINS] Lucene-Solr-7.x-Linux (64bit/jdk-9.0.1) - Build # 748 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Linux/748/ Java: 64bit/jdk-9.0.1 -XX:+UseCompressedOops -XX:+UseParallelGC 1 tests failed. FAILED: org.apache.solr.cloud.HttpPartitionTest.test Error Message: Didn't see all replicas for shard shard1 in c8n_1x2 come up within 9 ms!

[JENKINS] Lucene-Solr-Tests-master - Build # 2161 - Still Unstable

2017-11-05 Thread Apache Jenkins Server
Build: https://builds.apache.org/job/Lucene-Solr-Tests-master/2161/ 11 tests failed. FAILED: org.apache.solr.cloud.FullSolrCloudDistribCmdsTest.test Error Message: Could not load collection from ZK: collection2 Stack Trace: org.apache.solr.common.SolrException: Could not load collection from

[JENKINS] Lucene-Solr-SmokeRelease-7.x - Build # 72 - Still Failing

2017-11-05 Thread Apache Jenkins Server
Build: https://builds.apache.org/job/Lucene-Solr-SmokeRelease-7.x/72/ No tests ran. Build Log: [...truncated 28018 lines...] prepare-release-no-sign: [mkdir] Created dir: /home/jenkins/jenkins-slave/workspace/Lucene-Solr-SmokeRelease-7.x/lucene/build/smokeTestRelease/dist [copy]

[JENKINS] Lucene-Solr-7.x-Windows (32bit/jdk1.8.0_144) - Build # 288 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Windows/288/ Java: 32bit/jdk1.8.0_144 -client -XX:+UseConcMarkSweepGC 5 tests failed. FAILED: org.apache.solr.core.TestLazyCores.testNoCommit Error Message: Exception during query Stack Trace: java.lang.RuntimeException: Exception during

[JENKINS] Lucene-Solr-master-Linux (64bit/jdk-9.0.1) - Build # 20839 - Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-Linux/20839/ Java: 64bit/jdk-9.0.1 -XX:-UseCompressedOops -XX:+UseSerialGC 2 tests failed. FAILED: org.apache.solr.cloud.DeleteInactiveReplicaTest.deleteInactiveReplicaTest Error Message: Error from server at

[JENKINS-EA] Lucene-Solr-7.x-Linux (64bit/jdk-10-ea+29) - Build # 747 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-7.x-Linux/747/ Java: 64bit/jdk-10-ea+29 -XX:+UseCompressedOops -XX:+UseSerialGC 2 tests failed. FAILED: org.apache.solr.cloud.CollectionsAPIAsyncDistributedZkTest.testSolrJAPICalls Error Message: Shard split did not complete. Last recorded

[JENKINS] Lucene-Solr-master-Windows (32bit/jdk1.8.0_144) - Build # 7000 - Still Unstable!

2017-11-05 Thread Policeman Jenkins Server
Build: https://jenkins.thetaphi.de/job/Lucene-Solr-master-Windows/7000/ Java: 32bit/jdk1.8.0_144 -server -XX:+UseParallelGC 5 tests failed. FAILED: org.apache.solr.cloud.CollectionsAPIDistributedZkTest.testCollectionsAPI Error Message: Error from server at