[jira] [Commented] (SPARK-23470) org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription is too slow

2018-02-20 Thread Apache Spark (JIRA) 

[ 
https://issues.apache.org/jira/browse/SPARK-23470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16370632#comment-16370632
 ] 

Apache Spark commented on SPARK-23470:
--

User 'vanzin' has created a pull request for this issue:
https://github.com/apache/spark/pull/20644

> org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription is too slow
> --
>
> Key: SPARK-23470
> URL: https://issues.apache.org/jira/browse/SPARK-23470
> Project: Spark
>  Issue Type: Bug
>  Components: Web UI
>Affects Versions: 2.3.0
>Reporter: Shixiong Zhu
>Priority: Blocker
>
> I was testing 2.3.0 RC3 and found that it's easy to hit "read timeout" when 
> accessing All Jobs page. The stack dump says it was running 
> "org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription".
> {code}
> "SparkUI-59" #59 daemon prio=5 os_prio=0 tid=0x7fc15b0a3000 nid=0x8dc 
> runnable [0x7fc0ce9f8000]
>java.lang.Thread.State: RUNNABLE
>   at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>   at java.lang.reflect.Method.invoke(Method.java:498)
>   at 
> org.apache.spark.util.kvstore.KVTypeInfo$MethodAccessor.get(KVTypeInfo.java:154)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView.compare(InMemoryStore.java:248)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView.lambda$iterator$2(InMemoryStore.java:214)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView$$Lambda$36/1834982692.compare(Unknown
>  Source)
>   at java.util.TimSort.binarySort(TimSort.java:296)
>   at java.util.TimSort.sort(TimSort.java:239)
>   at java.util.Arrays.sort(Arrays.java:1512)
>   at java.util.ArrayList.sort(ArrayList.java:1460)
>   at java.util.stream.SortedOps$RefSortingSink.end(SortedOps.java:387)
>   at java.util.stream.Sink$ChainedReference.end(Sink.java:258)
>   at 
> java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.fillBuffer(StreamSpliterators.java:210)
>   at 
> java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.doAdvance(StreamSpliterators.java:161)
>   at 
> java.util.stream.StreamSpliterators$WrappingSpliterator.tryAdvance(StreamSpliterators.java:300)
>   at java.util.Spliterators$1Adapter.hasNext(Spliterators.java:681)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryIterator.hasNext(InMemoryStore.java:278)
>   at 
> org.apache.spark.status.AppStatusStore.lastStageAttempt(AppStatusStore.scala:101)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$$anonfun$38.apply(StagePage.scala:1014)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$$anonfun$38.apply(StagePage.scala:1014)
>   at 
> org.apache.spark.status.AppStatusStore.asOption(AppStatusStore.scala:408)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$.lastStageNameAndDescription(StagePage.scala:1014)
>   at 
> org.apache.spark.ui.jobs.JobDataSource.org$apache$spark$ui$jobs$JobDataSource$$jobRow(AllJobsPage.scala:434)
>   at 
> org.apache.spark.ui.jobs.JobDataSource$$anonfun$24.apply(AllJobsPage.scala:412)
>   at 
> org.apache.spark.ui.jobs.JobDataSource$$anonfun$24.apply(AllJobsPage.scala:412)
>   at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
>   at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
>   at scala.collection.immutable.List.foreach(List.scala:381)
>   at 
> scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
>   at scala.collection.mutable.ListBuffer.foreach(ListBuffer.scala:45)
>   at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
>   at scala.collection.AbstractTraversable.map(Traversable.scala:104)
>   at org.apache.spark.ui.jobs.JobDataSource.(AllJobsPage.scala:412)
>   at org.apache.spark.ui.jobs.JobPagedTable.(AllJobsPage.scala:504)
>   at org.apache.spark.ui.jobs.AllJobsPage.jobsTable(AllJobsPage.scala:246)
>   at org.apache.spark.ui.jobs.AllJobsPage.render(AllJobsPage.scala:295)
>   at org.apache.spark.ui.WebUI$$anonfun$3.apply(WebUI.scala:98)
>   at org.apache.spark.ui.WebUI$$anonfun$3.apply(WebUI.scala:98)
>   at org.apache.spark.ui.JettyUtils$$anon$3.doGet(JettyUtils.scala:90)
>   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:848)
>   at 
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:584)
>   at 
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
>   at 
>

[jira] [Commented] (SPARK-23470) org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription is too slow

2018-02-20 Thread Marcelo Vanzin (JIRA) 

[ 
https://issues.apache.org/jira/browse/SPARK-23470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16370532#comment-16370532
 ] 

Marcelo Vanzin commented on SPARK-23470:


Sure, I'll take a look in the PM.

> org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription is too slow
> --
>
> Key: SPARK-23470
> URL: https://issues.apache.org/jira/browse/SPARK-23470
> Project: Spark
>  Issue Type: Bug
>  Components: Web UI
>Affects Versions: 2.3.0
>Reporter: Shixiong Zhu
>Priority: Blocker
>
> I was testing 2.3.0 RC3 and found that it's easy to hit "read timeout" in 
> Spark UI. The stack dump says it was running 
> "org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription".
> {code}
> "SparkUI-59" #59 daemon prio=5 os_prio=0 tid=0x7fc15b0a3000 nid=0x8dc 
> runnable [0x7fc0ce9f8000]
>java.lang.Thread.State: RUNNABLE
>   at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>   at java.lang.reflect.Method.invoke(Method.java:498)
>   at 
> org.apache.spark.util.kvstore.KVTypeInfo$MethodAccessor.get(KVTypeInfo.java:154)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView.compare(InMemoryStore.java:248)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView.lambda$iterator$2(InMemoryStore.java:214)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView$$Lambda$36/1834982692.compare(Unknown
>  Source)
>   at java.util.TimSort.binarySort(TimSort.java:296)
>   at java.util.TimSort.sort(TimSort.java:239)
>   at java.util.Arrays.sort(Arrays.java:1512)
>   at java.util.ArrayList.sort(ArrayList.java:1460)
>   at java.util.stream.SortedOps$RefSortingSink.end(SortedOps.java:387)
>   at java.util.stream.Sink$ChainedReference.end(Sink.java:258)
>   at 
> java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.fillBuffer(StreamSpliterators.java:210)
>   at 
> java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.doAdvance(StreamSpliterators.java:161)
>   at 
> java.util.stream.StreamSpliterators$WrappingSpliterator.tryAdvance(StreamSpliterators.java:300)
>   at java.util.Spliterators$1Adapter.hasNext(Spliterators.java:681)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryIterator.hasNext(InMemoryStore.java:278)
>   at 
> org.apache.spark.status.AppStatusStore.lastStageAttempt(AppStatusStore.scala:101)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$$anonfun$38.apply(StagePage.scala:1014)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$$anonfun$38.apply(StagePage.scala:1014)
>   at 
> org.apache.spark.status.AppStatusStore.asOption(AppStatusStore.scala:408)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$.lastStageNameAndDescription(StagePage.scala:1014)
>   at 
> org.apache.spark.ui.jobs.JobDataSource.org$apache$spark$ui$jobs$JobDataSource$$jobRow(AllJobsPage.scala:434)
>   at 
> org.apache.spark.ui.jobs.JobDataSource$$anonfun$24.apply(AllJobsPage.scala:412)
>   at 
> org.apache.spark.ui.jobs.JobDataSource$$anonfun$24.apply(AllJobsPage.scala:412)
>   at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
>   at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
>   at scala.collection.immutable.List.foreach(List.scala:381)
>   at 
> scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
>   at scala.collection.mutable.ListBuffer.foreach(ListBuffer.scala:45)
>   at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
>   at scala.collection.AbstractTraversable.map(Traversable.scala:104)
>   at org.apache.spark.ui.jobs.JobDataSource.(AllJobsPage.scala:412)
>   at org.apache.spark.ui.jobs.JobPagedTable.(AllJobsPage.scala:504)
>   at org.apache.spark.ui.jobs.AllJobsPage.jobsTable(AllJobsPage.scala:246)
>   at org.apache.spark.ui.jobs.AllJobsPage.render(AllJobsPage.scala:295)
>   at org.apache.spark.ui.WebUI$$anonfun$3.apply(WebUI.scala:98)
>   at org.apache.spark.ui.WebUI$$anonfun$3.apply(WebUI.scala:98)
>   at org.apache.spark.ui.JettyUtils$$anon$3.doGet(JettyUtils.scala:90)
>   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:848)
>   at 
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:584)
>   at 
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
>   at 
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
>   at 
>

[jira] [Commented] (SPARK-23470) org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription is too slow

2018-02-20 Thread Shixiong Zhu (JIRA) 

[ 
https://issues.apache.org/jira/browse/SPARK-23470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16370531#comment-16370531
 ] 

Shixiong Zhu commented on SPARK-23470:
--

[~vanzin] could you make a PR to fix it? I can help you test the patch.

> org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription is too slow
> --
>
> Key: SPARK-23470
> URL: https://issues.apache.org/jira/browse/SPARK-23470
> Project: Spark
>  Issue Type: Bug
>  Components: Web UI
>Affects Versions: 2.3.0
>Reporter: Shixiong Zhu
>Priority: Major
>
> I was testing 2.3.0 RC3 and found that it's easy to hit "read timeout" in 
> Spark UI. The stack dump says it was running 
> "org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription".
> {code}
> "SparkUI-59" #59 daemon prio=5 os_prio=0 tid=0x7fc15b0a3000 nid=0x8dc 
> runnable [0x7fc0ce9f8000]
>java.lang.Thread.State: RUNNABLE
>   at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>   at java.lang.reflect.Method.invoke(Method.java:498)
>   at 
> org.apache.spark.util.kvstore.KVTypeInfo$MethodAccessor.get(KVTypeInfo.java:154)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView.compare(InMemoryStore.java:248)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView.lambda$iterator$2(InMemoryStore.java:214)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView$$Lambda$36/1834982692.compare(Unknown
>  Source)
>   at java.util.TimSort.binarySort(TimSort.java:296)
>   at java.util.TimSort.sort(TimSort.java:239)
>   at java.util.Arrays.sort(Arrays.java:1512)
>   at java.util.ArrayList.sort(ArrayList.java:1460)
>   at java.util.stream.SortedOps$RefSortingSink.end(SortedOps.java:387)
>   at java.util.stream.Sink$ChainedReference.end(Sink.java:258)
>   at 
> java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.fillBuffer(StreamSpliterators.java:210)
>   at 
> java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.doAdvance(StreamSpliterators.java:161)
>   at 
> java.util.stream.StreamSpliterators$WrappingSpliterator.tryAdvance(StreamSpliterators.java:300)
>   at java.util.Spliterators$1Adapter.hasNext(Spliterators.java:681)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryIterator.hasNext(InMemoryStore.java:278)
>   at 
> org.apache.spark.status.AppStatusStore.lastStageAttempt(AppStatusStore.scala:101)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$$anonfun$38.apply(StagePage.scala:1014)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$$anonfun$38.apply(StagePage.scala:1014)
>   at 
> org.apache.spark.status.AppStatusStore.asOption(AppStatusStore.scala:408)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$.lastStageNameAndDescription(StagePage.scala:1014)
>   at 
> org.apache.spark.ui.jobs.JobDataSource.org$apache$spark$ui$jobs$JobDataSource$$jobRow(AllJobsPage.scala:434)
>   at 
> org.apache.spark.ui.jobs.JobDataSource$$anonfun$24.apply(AllJobsPage.scala:412)
>   at 
> org.apache.spark.ui.jobs.JobDataSource$$anonfun$24.apply(AllJobsPage.scala:412)
>   at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
>   at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
>   at scala.collection.immutable.List.foreach(List.scala:381)
>   at 
> scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
>   at scala.collection.mutable.ListBuffer.foreach(ListBuffer.scala:45)
>   at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
>   at scala.collection.AbstractTraversable.map(Traversable.scala:104)
>   at org.apache.spark.ui.jobs.JobDataSource.(AllJobsPage.scala:412)
>   at org.apache.spark.ui.jobs.JobPagedTable.(AllJobsPage.scala:504)
>   at org.apache.spark.ui.jobs.AllJobsPage.jobsTable(AllJobsPage.scala:246)
>   at org.apache.spark.ui.jobs.AllJobsPage.render(AllJobsPage.scala:295)
>   at org.apache.spark.ui.WebUI$$anonfun$3.apply(WebUI.scala:98)
>   at org.apache.spark.ui.WebUI$$anonfun$3.apply(WebUI.scala:98)
>   at org.apache.spark.ui.JettyUtils$$anon$3.doGet(JettyUtils.scala:90)
>   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:848)
>   at 
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:584)
>   at 
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
>   at 
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
>   at 
>

[jira] [Commented] (SPARK-23470) org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription is too slow

2018-02-20 Thread Marcelo Vanzin (JIRA) 

[ 
https://issues.apache.org/jira/browse/SPARK-23470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16370508#comment-16370508
 ] 

Marcelo Vanzin commented on SPARK-23470:


It should be pretty easy to make {{lastStageNameAndDescription}} faster. It 
doesn't need the last attempt, just any attempt of the stage, since the name 
and description should be the same. So it could just call 
{{store.stageAttempt(stageId, 0)}} instead of {{lastStageAttempt}}.

> org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription is too slow
> --
>
> Key: SPARK-23470
> URL: https://issues.apache.org/jira/browse/SPARK-23470
> Project: Spark
>  Issue Type: Bug
>  Components: Web UI
>Affects Versions: 2.3.0
>Reporter: Shixiong Zhu
>Priority: Major
>
> I was testing 2.3.0 RC3 and found that it's easy to hit "read timeout" in 
> Spark UI. The stack dump says it was running 
> "org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription".
> {code}
> "SparkUI-59" #59 daemon prio=5 os_prio=0 tid=0x7fc15b0a3000 nid=0x8dc 
> runnable [0x7fc0ce9f8000]
>java.lang.Thread.State: RUNNABLE
>   at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>   at java.lang.reflect.Method.invoke(Method.java:498)
>   at 
> org.apache.spark.util.kvstore.KVTypeInfo$MethodAccessor.get(KVTypeInfo.java:154)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView.compare(InMemoryStore.java:248)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView.lambda$iterator$2(InMemoryStore.java:214)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView$$Lambda$36/1834982692.compare(Unknown
>  Source)
>   at java.util.TimSort.binarySort(TimSort.java:296)
>   at java.util.TimSort.sort(TimSort.java:239)
>   at java.util.Arrays.sort(Arrays.java:1512)
>   at java.util.ArrayList.sort(ArrayList.java:1460)
>   at java.util.stream.SortedOps$RefSortingSink.end(SortedOps.java:387)
>   at java.util.stream.Sink$ChainedReference.end(Sink.java:258)
>   at 
> java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.fillBuffer(StreamSpliterators.java:210)
>   at 
> java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.doAdvance(StreamSpliterators.java:161)
>   at 
> java.util.stream.StreamSpliterators$WrappingSpliterator.tryAdvance(StreamSpliterators.java:300)
>   at java.util.Spliterators$1Adapter.hasNext(Spliterators.java:681)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryIterator.hasNext(InMemoryStore.java:278)
>   at 
> org.apache.spark.status.AppStatusStore.lastStageAttempt(AppStatusStore.scala:101)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$$anonfun$38.apply(StagePage.scala:1014)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$$anonfun$38.apply(StagePage.scala:1014)
>   at 
> org.apache.spark.status.AppStatusStore.asOption(AppStatusStore.scala:408)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$.lastStageNameAndDescription(StagePage.scala:1014)
>   at 
> org.apache.spark.ui.jobs.JobDataSource.org$apache$spark$ui$jobs$JobDataSource$$jobRow(AllJobsPage.scala:434)
>   at 
> org.apache.spark.ui.jobs.JobDataSource$$anonfun$24.apply(AllJobsPage.scala:412)
>   at 
> org.apache.spark.ui.jobs.JobDataSource$$anonfun$24.apply(AllJobsPage.scala:412)
>   at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
>   at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
>   at scala.collection.immutable.List.foreach(List.scala:381)
>   at 
> scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
>   at scala.collection.mutable.ListBuffer.foreach(ListBuffer.scala:45)
>   at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
>   at scala.collection.AbstractTraversable.map(Traversable.scala:104)
>   at org.apache.spark.ui.jobs.JobDataSource.(AllJobsPage.scala:412)
>   at org.apache.spark.ui.jobs.JobPagedTable.(AllJobsPage.scala:504)
>   at org.apache.spark.ui.jobs.AllJobsPage.jobsTable(AllJobsPage.scala:246)
>   at org.apache.spark.ui.jobs.AllJobsPage.render(AllJobsPage.scala:295)
>   at org.apache.spark.ui.WebUI$$anonfun$3.apply(WebUI.scala:98)
>   at org.apache.spark.ui.WebUI$$anonfun$3.apply(WebUI.scala:98)
>   at org.apache.spark.ui.JettyUtils$$anon$3.doGet(JettyUtils.scala:90)
>   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:848)
>   at 
>

[jira] [Commented] (SPARK-23470) org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription is too slow

2018-02-20 Thread Shixiong Zhu (JIRA) 

[ 
https://issues.apache.org/jira/browse/SPARK-23470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16370496#comment-16370496
 ] 

Shixiong Zhu commented on SPARK-23470:
--

[~vanzin] [~cloud_fan]

> org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription is too slow
> --
>
> Key: SPARK-23470
> URL: https://issues.apache.org/jira/browse/SPARK-23470
> Project: Spark
>  Issue Type: Bug
>  Components: Web UI
>Affects Versions: 2.3.0
>Reporter: Shixiong Zhu
>Priority: Major
>
> I was testing 2.3.0 RC3 and found that it's easy to hit "read timeout" in 
> Spark UI. The stack dump says it was running 
> "org.apache.spark.ui.jobs.ApiHelper.lastStageNameAndDescription".
> {code}
> "SparkUI-59" #59 daemon prio=5 os_prio=0 tid=0x7fc15b0a3000 nid=0x8dc 
> runnable [0x7fc0ce9f8000]
>java.lang.Thread.State: RUNNABLE
>   at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>   at java.lang.reflect.Method.invoke(Method.java:498)
>   at 
> org.apache.spark.util.kvstore.KVTypeInfo$MethodAccessor.get(KVTypeInfo.java:154)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView.compare(InMemoryStore.java:248)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView.lambda$iterator$2(InMemoryStore.java:214)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryView$$Lambda$36/1834982692.compare(Unknown
>  Source)
>   at java.util.TimSort.binarySort(TimSort.java:296)
>   at java.util.TimSort.sort(TimSort.java:239)
>   at java.util.Arrays.sort(Arrays.java:1512)
>   at java.util.ArrayList.sort(ArrayList.java:1460)
>   at java.util.stream.SortedOps$RefSortingSink.end(SortedOps.java:387)
>   at java.util.stream.Sink$ChainedReference.end(Sink.java:258)
>   at 
> java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.fillBuffer(StreamSpliterators.java:210)
>   at 
> java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.doAdvance(StreamSpliterators.java:161)
>   at 
> java.util.stream.StreamSpliterators$WrappingSpliterator.tryAdvance(StreamSpliterators.java:300)
>   at java.util.Spliterators$1Adapter.hasNext(Spliterators.java:681)
>   at 
> org.apache.spark.util.kvstore.InMemoryStore$InMemoryIterator.hasNext(InMemoryStore.java:278)
>   at 
> org.apache.spark.status.AppStatusStore.lastStageAttempt(AppStatusStore.scala:101)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$$anonfun$38.apply(StagePage.scala:1014)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$$anonfun$38.apply(StagePage.scala:1014)
>   at 
> org.apache.spark.status.AppStatusStore.asOption(AppStatusStore.scala:408)
>   at 
> org.apache.spark.ui.jobs.ApiHelper$.lastStageNameAndDescription(StagePage.scala:1014)
>   at 
> org.apache.spark.ui.jobs.JobDataSource.org$apache$spark$ui$jobs$JobDataSource$$jobRow(AllJobsPage.scala:434)
>   at 
> org.apache.spark.ui.jobs.JobDataSource$$anonfun$24.apply(AllJobsPage.scala:412)
>   at 
> org.apache.spark.ui.jobs.JobDataSource$$anonfun$24.apply(AllJobsPage.scala:412)
>   at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
>   at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
>   at scala.collection.immutable.List.foreach(List.scala:381)
>   at 
> scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
>   at scala.collection.mutable.ListBuffer.foreach(ListBuffer.scala:45)
>   at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
>   at scala.collection.AbstractTraversable.map(Traversable.scala:104)
>   at org.apache.spark.ui.jobs.JobDataSource.(AllJobsPage.scala:412)
>   at org.apache.spark.ui.jobs.JobPagedTable.(AllJobsPage.scala:504)
>   at org.apache.spark.ui.jobs.AllJobsPage.jobsTable(AllJobsPage.scala:246)
>   at org.apache.spark.ui.jobs.AllJobsPage.render(AllJobsPage.scala:295)
>   at org.apache.spark.ui.WebUI$$anonfun$3.apply(WebUI.scala:98)
>   at org.apache.spark.ui.WebUI$$anonfun$3.apply(WebUI.scala:98)
>   at org.apache.spark.ui.JettyUtils$$anon$3.doGet(JettyUtils.scala:90)
>   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:848)
>   at 
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:584)
>   at 
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
>   at 
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
>   at 
>