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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3914) Restarting HDFS caused scan to fail
Date Wed, 01 Jul 2015 15:49:05 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14610502#comment-14610502
] 

Josh Elser commented on ACCUMULO-3914:
--------------------------------------

Thanks for the detailed explanation, Steve. It's appreciated.

I think most of the time, we've made the decision to keep retrying as long as possible in
our use of HDSF. This has helped us make a more overall "stable" product in that I definitively
know that I can kill -9 HDFS, go get lunch, restart it when I get back, and Accumulo will
happily start working again. Is the retry policy something we can do locally and not globally
(not in hdfs-site.xml)?

Maybe using an explicit policy from HDFS would simplify some of our code? What do you think
[~ecn], [~kturner]?

> Restarting HDFS caused scan to fail 
> ------------------------------------
>
>                 Key: ACCUMULO-3914
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3914
>             Project: Accumulo
>          Issue Type: Bug
>            Reporter: Keith Turner
>            Assignee: Eric Newton
>             Fix For: 1.8.0
>
>         Attachments: ACCUMULO-3914-001.patch
>
>
> I was running random walk to test 1.6.3 RC1.   I had an incorrect hdfs config.  I changed
the hdfs config and restarted hdfs while the test was running.   I would not have expected
this to cause problems, but it caused scans to fail.
> Below are client logs from RW.
> {noformat}
> 23 14:37:36,547 [randomwalk.Framework] ERROR: Error during random walk
> java.lang.Exception: Error running node Conditional.xml
>         at org.apache.accumulo.test.randomwalk.Module.visit(Module.java:344)
>         at org.apache.accumulo.test.randomwalk.Framework.run(Framework.java:63)
>         at org.apache.accumulo.test.randomwalk.Framework.main(Framework.java:122)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:606)
>         at org.apache.accumulo.start.Main$1.run(Main.java:141)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.Exception: Error running node ct.Transfer
>         at org.apache.accumulo.test.randomwalk.Module.visit(Module.java:344)
>         at org.apache.accumulo.test.randomwalk.Module$1.call(Module.java:281)
>         at org.apache.accumulo.test.randomwalk.Module$1.call(Module.java:276)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:262)
>         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:262)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>         at org.apache.accumulo.trace.instrument.TraceRunnable.run(TraceRunnable.java:47)
>         at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
>         ... 1 more
> Caused by: java.lang.RuntimeException: org.apache.accumulo.core.client.impl.AccumuloServerException:
Error on server worker0:9997
>         at org.apache.accumulo.core.client.impl.ScannerIterator.hasNext(ScannerIterator.java:187)
>         at org.apache.accumulo.core.client.IsolatedScanner$RowBufferingIterator.readRow(IsolatedScanner.java:69)
>         at org.apache.accumulo.core.client.IsolatedScanner$RowBufferingIterator.<init>(IsolatedScanner.java:148)
>         at org.apache.accumulo.core.client.IsolatedScanner.iterator(IsolatedScanner.java:236)
>         at org.apache.accumulo.test.randomwalk.conditional.Transfer.visit(Transfer.java:91)
>         ... 10 more
> Caused by: org.apache.accumulo.core.client.impl.AccumuloServerException: Error on server
worker0:9997
>         at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:287)
>         at org.apache.accumulo.core.client.impl.ScannerIterator$Reader.run(ScannerIterator.java:84)
>         at org.apache.accumulo.core.client.impl.ScannerIterator.hasNext(ScannerIterator.java:177)
>         ... 14 more
> Caused by: org.apache.thrift.TApplicationException: Internal error processing startScan
>         at org.apache.thrift.TApplicationException.read(TApplicationException.java:111)
>         at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:71)
>         at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startScan(TabletClientService.java:228)
>         at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startScan(TabletClientService.java:204)
>         at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:403)
>         at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:279)
>         ... 16 more
> {noformat}
> Below are logs from the tserver.
> {noformat}
> 2015-06-23 14:37:36,553 [thrift.ProcessFunction] ERROR: Internal error processing startScan
> org.apache.thrift.TException: java.util.concurrent.ExecutionException: java.net.ConnectException:
Call From worker0/10.1.5.184 to leader2:10000 failed on connection exception: java.net.ConnectException:
Connection refused; For more detai
> ls see:  http://wiki.apache.org/hadoop/ConnectionRefused
>         at org.apache.accumulo.server.util.RpcWrapper$1.invoke(RpcWrapper.java:51)
>         at com.sun.proxy.$Proxy17.startScan(Unknown Source)
>         at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$startScan.getResult(TabletClientService.java:2179)
>         at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Processor$startScan.getResult(TabletClientService.java:2163)
>         at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
>         at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
>         at org.apache.accumulo.server.util.TServerUtils$TimedProcessor.process(TServerUtils.java:168)
>         at org.apache.thrift.server.AbstractNonblockingServer$FrameBuffer.invoke(AbstractNonblockingServer.java:516)
>         at org.apache.accumulo.server.util.CustomNonBlockingServer$1.run(CustomNonBlockingServer.java:77)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>         at org.apache.accumulo.trace.instrument.TraceRunnable.run(TraceRunnable.java:47)
>         at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
>         at java.lang.Thread.run(Thread.java:745)
> 2015-06-23 14:37:36,556 [tserver.TabletServer] WARN : exception while scanning tablet
b;b174<
> java.net.ConnectException: Call From worker0/10.1.5.184 to leader2:10000 failed on connection
exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
>         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
>         at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
>         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>         at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
>         at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:791)
>         at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:731)
>         at org.apache.hadoop.ipc.Client.call(Client.java:1472)
>         at org.apache.hadoop.ipc.Client.call(Client.java:1399)
>         at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:232)
>         at com.sun.proxy.$Proxy15.getBlockLocations(Unknown Source)
>         at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getBlockLocations(ClientNamenodeProtocolTranslatorPB.java:254)
>         at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:606)
>         at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:187)
>         at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
>         at com.sun.proxy.$Proxy16.getBlockLocations(Unknown Source)
>         at org.apache.hadoop.hdfs.DFSClient.callGetBlockLocations(DFSClient.java:1220)
>         at org.apache.hadoop.hdfs.DFSClient.getLocatedBlocks(DFSClient.java:1210)
>         at org.apache.hadoop.hdfs.DFSClient.getLocatedBlocks(DFSClient.java:1200)
>         at org.apache.hadoop.hdfs.DFSInputStream.fetchLocatedBlocksAndGetLastBlockLength(DFSInputStream.java:271)
>         at org.apache.hadoop.hdfs.DFSInputStream.openInfo(DFSInputStream.java:238)
>         at org.apache.hadoop.hdfs.DFSInputStream.<init>(DFSInputStream.java:231)
>         at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:1498)
>         at org.apache.hadoop.hdfs.DistributedFileSystem$3.doCall(DistributedFileSystem.java:302)
>         at org.apache.hadoop.hdfs.DistributedFileSystem$3.doCall(DistributedFileSystem.java:298)
>         at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>         at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:298)
>         at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:766)
>         at org.apache.accumulo.core.file.blockfile.impl.CachableBlockFile$Reader.getBCFile(CachableBlockFile.java:263)
>         at org.apache.accumulo.core.file.blockfile.impl.CachableBlockFile$Reader.access$100(CachableBlockFile.java:144)
>         at org.apache.accumulo.core.file.blockfile.impl.CachableBlockFile$Reader$RawBlockLoader.get(CachableBlockFile.java:195)
>         at org.apache.accumulo.core.file.blockfile.impl.CachableBlockFile$Reader.getBlock(CachableBlockFile.java:320)
>         at org.apache.accumulo.core.file.blockfile.impl.CachableBlockFile$Reader.getDataBlock(CachableBlockFile.java:400)
>         at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader.getDataBlock(RFile.java:590)
>         at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader._seek(RFile.java:715)
>         at org.apache.accumulo.core.file.rfile.RFile$LocalityGroupReader.seek(RFile.java:607)
>         at org.apache.accumulo.core.iterators.system.LocalityGroupIterator.seek(LocalityGroupIterator.java:138)
>         at org.apache.accumulo.core.file.rfile.RFile$Reader.seek(RFile.java:980)
>         at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.readNext(SourceSwitchingIterator.java:135)
>         at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.seek(SourceSwitchingIterator.java:182)
>         at org.apache.accumulo.server.problems.ProblemReportingIterator.seek(ProblemReportingIterator.java:94)
>         at org.apache.accumulo.core.iterators.system.MultiIterator.seek(MultiIterator.java:105)
>         at org.apache.accumulo.core.iterators.WrappingIterator.seek(WrappingIterator.java:101)
>         at org.apache.accumulo.core.iterators.system.StatsIterator.seek(StatsIterator.java:64)
>         at org.apache.accumulo.core.iterators.WrappingIterator.seek(WrappingIterator.java:101)
>         at org.apache.accumulo.core.iterators.system.DeletingIterator.seek(DeletingIterator.java:67)
>         at org.apache.accumulo.core.iterators.WrappingIterator.seek(WrappingIterator.java:101)
>         at org.apache.accumulo.core.iterators.SkippingIterator.seek(SkippingIterator.java:42)
>         at org.apache.accumulo.core.iterators.system.ColumnFamilySkippingIterator.seek(ColumnFamilySkippingIterator.java:123)
>         at org.apache.accumulo.core.iterators.WrappingIterator.seek(WrappingIterator.java:101)
>         at org.apache.accumulo.core.iterators.Filter.seek(Filter.java:64)
>         at org.apache.accumulo.core.iterators.WrappingIterator.seek(WrappingIterator.java:101)
>         at org.apache.accumulo.core.iterators.Filter.seek(Filter.java:64)
>         at org.apache.accumulo.core.iterators.system.SynchronizedIterator.seek(SynchronizedIterator.java:56)
>         at org.apache.accumulo.core.iterators.WrappingIterator.seek(WrappingIterator.java:101)
>         at org.apache.accumulo.core.iterators.user.VersioningIterator.seek(VersioningIterator.java:81)
>         at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.readNext(SourceSwitchingIterator.java:135)
>         at org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.seek(SourceSwitchingIterator.java:182)
>         at org.apache.accumulo.tserver.Tablet.nextBatch(Tablet.java:1664)
>         at org.apache.accumulo.tserver.Tablet.access$3200(Tablet.java:174)
>         at org.apache.accumulo.tserver.Tablet$Scanner.read(Tablet.java:1804)
>         at org.apache.accumulo.tserver.TabletServer$ThriftClientHandler$NextBatchTask.run(TabletServer.java:1081)
>         at org.apache.accumulo.trace.instrument.TraceRunnable.run(TraceRunnable.java:47)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>         at org.apache.accumulo.trace.instrument.TraceRunnable.run(TraceRunnable.java:47)
>         at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: java.net.ConnectException: Connection refused
>         at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>         at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
>         at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
>         at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:530)
>         at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:494)
>         at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:607)
>         at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:705)
>         at org.apache.hadoop.ipc.Client$Connection.access$2800(Client.java:368)
>         at org.apache.hadoop.ipc.Client.getConnection(Client.java:1521)
>         at org.apache.hadoop.ipc.Client.call(Client.java:1438)
>         ... 62 more
> {noformat}



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