[jira] [Resolved] (RATIS-1300) NPE from SegmentedRaftLogCache#getOpenSegmentSizeInBytes

["runzhiwang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/RATIS-1300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

runzhiwang resolved RATIS-1300.
-------------------------------
    Resolution: Fixed

> NPE from SegmentedRaftLogCache#getOpenSegmentSizeInBytes
> --------------------------------------------------------
>
>                 Key: RATIS-1300
>                 URL: https://issues.apache.org/jira/browse/RATIS-1300
>             Project: Ratis
>          Issue Type: Bug
>            Reporter: Marton Elek
>            Assignee: runzhiwang
>            Priority: Blocker
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> Got this exception during Ozone tests:
> {code}
> 2021-01-28 12:29:41 WARN  HttpChannel:600 - /prom
> java.lang.NullPointerException: Cannot invoke "org.apache.ratis.server.raftlog.segmented.LogSegment.getTotalFileSize()" because "this.openSegment" is null
> 	at org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogCache.getOpenSegmentSizeInBytes(SegmentedRaftLogCache.java:402)
> 	at org.apache.ratis.server.metrics.SegmentedRaftLogMetrics.lambda$null$6(SegmentedRaftLogMetrics.java:104)
> 	at io.prometheus.client.dropwizard.DropwizardExports.fromGauge(DropwizardExports.java:62)
> 	at io.prometheus.client.dropwizard.DropwizardExports.collect(DropwizardExports.java:132)
> 	at io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.findNextElement(CollectorRegistry.java:190)
> 	at io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.nextElement(CollectorRegistry.java:223)
> 	at io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.nextElement(CollectorRegistry.java:144)
> 	at io.prometheus.client.exporter.common.TextFormat.write004(TextFormat.java:22)
> 	at org.apache.hadoop.hdds.server.http.PrometheusServlet.doGet(PrometheusServlet.java:66)
> 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
> 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
> 	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:791)
> 	at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1626)
> 	at org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter.doFilter(StaticUserWebFilter.java:110)
> 	at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
> 	at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
> 	at org.apache.hadoop.hdds.server.http.HttpServer2$QuotingInputFilter.doFilter(HttpServer2.java:1667)
> 	at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
> 	at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
> 	at org.apache.hadoop.hdds.server.http.NoCacheFilter.doFilter(NoCacheFilter.java:48)
> 	at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
> 	at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
> 	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:548)
> 	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
> 	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:602)
> 	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
> 	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
> 	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1612)
> 	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
> 	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1434)
> 	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
> 	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501)
> 	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1582)
> 	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
> 	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1349)
> 	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
> 	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146)
> 	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
> 	at org.eclipse.jetty.server.Server.handle(Server.java:516)
> 	at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383)
> 	at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:556)
> 	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375)
> 	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:273)
> 	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
> 	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
> 	at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
> 	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
> 	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
> 	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
> 	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129)
> 	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375)
> 	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:773)
> 	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:905)
> 	at java.base/java.lang.Thread.run(Thread.java:832)
> {code}
> There shouldn't be any NPE, IMHO.



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