See 
<https://builds.apache.org/job/beam_Release_NightlySnapshot/426/display/redirect?page=changes>

Changes:

[klk] Rename PCollections to PCollectionTranslation

[klk] Rename PTransforms to PTransformTranslation

[klk] Rename ParDos to ParDoTranslation

[klk] Rename WindowIntoTranslator to WindowIntoTranslation

[klk] Rename ReadTranslator to ReadTranslation

[klk] Rename Coders to CoderTranslation

[klk] Rename WindowingStrategies to WindowingStrategyTranslation

[klk] Rename Triggers to TriggerTranslation

[klk] Do not ever shrink allowed lateness

[klk] Adds large key tests to GroupByKeyTest

[dhalperi] Initial implementation of SpannerIO.Write

[dhalperi] Minor style, compilation, javadoc fixups

[dhalperi] Fix spanner dependency management

[dhalperi] Delete SpannerCSVLoader

[dhalperi] Refine Spanner API tests

[dhalperi] SpannerIO.Write cleanup and style fixes

[robertwb] Automatically generate Python proto and grpc files.

[robertwb] Remove auto-generated proto and grpc files.

[robertwb] A couple of worker fixes.

[robertwb] Adding a snippet for metrics

------------------------------------------
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2017-05-25T07:02:42.827 [INFO] --- maven-install-plugin:2.5.2:install 
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2017-05-25T07:02:57.691 [INFO] Reactor Summary:
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2017-05-25T07:02:57.691 [INFO] Apache Beam :: Parent 
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2017-05-25T07:02:57.691 [INFO] BUILD FAILURE
2017-05-25T07:02:57.691 [INFO] 
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2017-05-25T07:02:57.691 [INFO] Total time: 01:25 min
2017-05-25T07:02:57.691 [INFO] Finished at: 2017-05-25T07:02:57+00:00
2017-05-25T07:02:57.947 [INFO] Final Memory: 61M/676M
2017-05-25T07:02:57.947 [INFO] 
------------------------------------------------------------------------
Waiting for Jenkins to finish collecting data
2017-05-25T07:03:00.282 [ERROR] Plugin 
org.apache.maven.plugins:maven-compiler-plugin:3.6.1 or one of its dependencies 
could not be resolved: Failed to read artifact descriptor for 
org.apache.maven.plugins:maven-compiler-plugin:jar:3.6.1: Could not transfer 
artifact org.apache.maven.plugins:maven-compiler-plugin:pom:3.6.1 from/to 
central (https://repo.maven.apache.org/maven2): Connection reset -> [Help 1]
org.apache.maven.plugin.PluginResolutionException: Plugin 
org.apache.maven.plugins:maven-compiler-plugin:3.6.1 or one of its dependencies 
could not be resolved: Failed to read artifact descriptor for 
org.apache.maven.plugins:maven-compiler-plugin:jar:3.6.1
        at 
org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:117)
        at 
org.apache.maven.plugin.internal.DefaultMavenPluginManager.getPluginDescriptor(DefaultMavenPluginManager.java:179)
        at 
org.apache.maven.plugin.internal.DefaultMavenPluginManager.getMojoDescriptor(DefaultMavenPluginManager.java:298)
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.getMojoDescriptor(DefaultBuildPluginManager.java:241)
        at 
org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.setupMojoExecution(DefaultLifecycleExecutionPlanCalculator.java:169)
        at 
org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.setupMojoExecutions(DefaultLifecycleExecutionPlanCalculator.java:155)
        at 
org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateExecutionPlan(DefaultLifecycleExecutionPlanCalculator.java:131)
        at 
org.apache.maven.lifecycle.internal.DefaultLifecycleExecutionPlanCalculator.calculateExecutionPlan(DefaultLifecycleExecutionPlanCalculator.java:145)
        at 
org.apache.maven.lifecycle.internal.builder.BuilderCommon.resolveBuildPlan(BuilderCommon.java:96)
        at 
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:109)
        at 
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
        at 
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
        at 
org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
        at 
org.jvnet.hudson.maven3.launcher.Maven33Launcher.main(Maven33Launcher.java:129)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:330)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:238)
        at jenkins.maven3.agent.Maven33Main.launch(Maven33Main.java:176)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at hudson.maven.Maven3Builder.call(Maven3Builder.java:139)
        at hudson.maven.Maven3Builder.call(Maven3Builder.java:70)
        at hudson.remoting.UserRequest.perform(UserRequest.java:153)
        at hudson.remoting.UserRequest.perform(UserRequest.java:50)
        at hudson.remoting.Request$2.run(Request.java:336)
        at 
hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.eclipse.aether.resolution.ArtifactDescriptorException: Failed to 
read artifact descriptor for 
org.apache.maven.plugins:maven-compiler-plugin:jar:3.6.1
        at 
org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:302)
        at 
org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor(DefaultArtifactDescriptorReader.java:218)
        at 
org.eclipse.aether.internal.impl.DefaultRepositorySystem.readArtifactDescriptor(DefaultRepositorySystem.java:287)
        at 
org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:103)
        ... 37 more
Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Could not 
transfer artifact org.apache.maven.plugins:maven-compiler-plugin:pom:3.6.1 
from/to central (https://repo.maven.apache.org/maven2): Connection reset
        at 
org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:444)
        at 
org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:246)
        at 
org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:223)
        at 
org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom(DefaultArtifactDescriptorReader.java:287)
        ... 40 more
Caused by: org.eclipse.aether.transfer.ArtifactTransferException: Could not 
transfer artifact org.apache.maven.plugins:maven-compiler-plugin:pom:3.6.1 
from/to central (https://repo.maven.apache.org/maven2): Connection reset
        at 
org.eclipse.aether.connector.basic.ArtifactTransportListener.transferFailed(ArtifactTransportListener.java:43)
        at 
org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run(BasicRepositoryConnector.java:355)
        at 
org.eclipse.aether.util.concurrency.RunnableErrorForwarder$1.run(RunnableErrorForwarder.java:67)
        at 
org.eclipse.aether.connector.basic.BasicRepositoryConnector$DirectExecutor.execute(BasicRepositoryConnector.java:581)
        at 
org.eclipse.aether.connector.basic.BasicRepositoryConnector.get(BasicRepositoryConnector.java:249)
        at 
org.eclipse.aether.internal.impl.DefaultArtifactResolver.performDownloads(DefaultArtifactResolver.java:520)
        at 
org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:421)
        ... 43 more
Caused by: org.apache.maven.wagon.TransferFailedException: Connection reset
        at 
org.apache.maven.wagon.providers.http.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:1066)
        at 
org.apache.maven.wagon.providers.http.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:960)
        at 
org.apache.maven.wagon.StreamWagon.getInputStream(StreamWagon.java:116)
        at org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:88)
        at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
        at 
org.eclipse.aether.transport.wagon.WagonTransporter$GetTaskRunner.run(WagonTransporter.java:560)
        at 
org.eclipse.aether.transport.wagon.WagonTransporter.execute(WagonTransporter.java:427)
        at 
org.eclipse.aether.transport.wagon.WagonTransporter.get(WagonTransporter.java:404)
        at 
org.eclipse.aether.connector.basic.BasicRepositoryConnector$GetTaskRunner.runTask(BasicRepositoryConnector.java:447)
        at 
org.eclipse.aether.connector.basic.BasicRepositoryConnector$TaskRunner.run(BasicRepositoryConnector.java:350)
        ... 48 more
Caused by: java.net.SocketException: Connection reset
        at java.net.SocketInputStream.read(SocketInputStream.java:210)
        at java.net.SocketInputStream.read(SocketInputStream.java:141)
        at sun.security.ssl.InputRecord.readFully(InputRecord.java:465)
        at sun.security.ssl.InputRecord.read(InputRecord.java:503)
        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:973)
        at sun.security.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:930)
        at sun.security.ssl.AppInputStream.read(AppInputStream.java:105)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:136)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:152)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:270)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:140)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:57)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:260)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:161)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:153)
        at 
org.apache.maven.wagon.providers.http.httpclient.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:271)
        at 
org.apache.maven.wagon.providers.http.httpclient.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:123)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.execchain.MainClientExec.execute(MainClientExec.java:254)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.execchain.ProtocolExec.execute(ProtocolExec.java:195)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.execchain.RetryExec.execute(RetryExec.java:86)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
        at 
org.apache.maven.wagon.providers.http.AbstractHttpClientWagon.execute(AbstractHttpClientWagon.java:832)
        at 
org.apache.maven.wagon.providers.http.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:983)
        ... 57 more
2017-05-25T07:03:00.284 [ERROR] 
2017-05-25T07:03:00.284 [ERROR] Re-run Maven using the -X switch to enable full 
debug logging.
2017-05-25T07:03:00.284 [ERROR] 
2017-05-25T07:03:00.284 [ERROR] For more information about the errors and 
possible solutions, please read the following articles:
2017-05-25T07:03:00.284 [ERROR] [Help 1] 
http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException
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