So do you know how to solve this issue apart from increasing the current file-max (4748198)?
2015-07-06 15:35 GMT+02:00 Stephan Ewen <se...@apache.org>: > I think the error is pretty much exactly in the stack trace: > > Caused by: java.io.FileNotFoundException: > /data/4/hadoop/tmp/flink-io-0e2460bf-964b-4883-8eee-12869b9476ab/ > 995a38a2c92536383d0057e3482999a9.000329.channel > (Too many open files in system) > > > > > On Mon, Jul 6, 2015 at 3:31 PM, Felix Neutatz <neut...@googlemail.com> > wrote: > > > Hi, > > > > I want to do some simple aggregations on 727 gz files (68 GB total) from > > HDFS. See code here: > > > > > > > https://github.com/FelixNeutatz/wikiTrends/blob/master/extraction/src/main/scala/io/sanfran/wikiTrends/extraction/flink/Stats.scala > > > > We are using a Flink-0.9 SNAPSHOT. > > > > I get the following error: > > > > Caused by: java.lang.Exception: The data preparation for task > > 'Reduce(Reduce at > > > > > org.apache.flink.api.scala.GroupedDataSet.reduce(GroupedDataSet.scala:293))' > > , caused an e > > rror: Error obtaining the sorted input: Thread 'SortMerger spilling > thread' > > terminated due to an exception: Channel to path > > '/data/4/hadoop/tmp/flink-io-0e2460bf-964b-488 > > 3-8eee-12869b9476ab/995a38a2c92536383d0057e3482999a9.000329.channel' > could > > not be opened. > > at > > > > > org.apache.flink.runtime.operators.RegularPactTask.run(RegularPactTask.java:471) > > at > > > > > org.apache.flink.runtime.operators.RegularPactTask.invoke(RegularPactTask.java:362) > > at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559) > > at java.lang.Thread.run(Thread.java:853) > > Caused by: java.lang.RuntimeException: Error obtaining the sorted input: > > Thread 'SortMerger spilling thread' terminated due to an exception: > Channel > > to path '/data/4/hado > > > > > op/tmp/flink-io-0e2460bf-964b-4883-8eee-12869b9476ab/995a38a2c92536383d0057e3482999a9.000329.channel' > > could not be opened. > > at > > > > > org.apache.flink.runtime.operators.sort.UnilateralSortMerger.getIterator(UnilateralSortMerger.java:607) > > at > > > > > org.apache.flink.runtime.operators.RegularPactTask.getInput(RegularPactTask.java:1145) > > at > > > > > org.apache.flink.runtime.operators.ReduceDriver.prepare(ReduceDriver.java:93) > > at > > > > > org.apache.flink.runtime.operators.RegularPactTask.run(RegularPactTask.java:466) > > ... 3 more > > Caused by: java.io.IOException: Thread 'SortMerger spilling thread' > > terminated due to an exception: Channel to path > > '/data/4/hadoop/tmp/flink-io-0e2460bf-964b-4883-8eee-1 > > 2869b9476ab/995a38a2c92536383d0057e3482999a9.000329.channel' could not be > > opened. > > at > > > > > org.apache.flink.runtime.operators.sort.UnilateralSortMerger$ThreadBase.run(UnilateralSortMerger.java:784) > > Caused by: java.io.IOException: Channel to path > > > > > '/data/4/hadoop/tmp/flink-io-0e2460bf-964b-4883-8eee-12869b9476ab/995a38a2c92536383d0057e3482999a9.000329.channel' > > could n > > ot be opened. > > at > > > > > org.apache.flink.runtime.io.disk.iomanager.AbstractFileIOChannel.<init>(AbstractFileIOChannel.java:61) > > at > > > > > org.apache.flink.runtime.io.disk.iomanager.AsynchronousFileIOChannel.<init>(AsynchronousFileIOChannel.java:86) > > at > > > > > org.apache.flink.runtime.io.disk.iomanager.AsynchronousBlockWriterWithCallback.<init>(AsynchronousBlockWriterWithCallback.java:42) > > at > > > > > org.apache.flink.runtime.io.disk.iomanager.AsynchronousBlockWriter.<init>(AsynchronousBlockWriter.java:44) > > at > > > > > org.apache.flink.runtime.io.disk.iomanager.IOManagerAsync.createBlockChannelWriter(IOManagerAsync.java:195) > > at > > > > > org.apache.flink.runtime.io.disk.iomanager.IOManager.createBlockChannelWriter(IOManager.java:218) > > at > > > > > org.apache.flink.runtime.operators.sort.UnilateralSortMerger$SpillingThread.go(UnilateralSortMerger.java:1318) > > at > > > > > org.apache.flink.runtime.operators.sort.UnilateralSortMerger$ThreadBase.run(UnilateralSortMerger.java:781) > > Caused by: java.io.FileNotFoundException: > > > > > /data/4/hadoop/tmp/flink-io-0e2460bf-964b-4883-8eee-12869b9476ab/995a38a2c92536383d0057e3482999a9.000329.channel > > (Too many open > > files in system) > > at java.io.RandomAccessFile.<init>(RandomAccessFile.java:252) > > at java.io.RandomAccessFile.<init>(RandomAccessFile.java:133) > > at > > > > > org.apache.flink.runtime.io.disk.iomanager.AbstractFileIOChannel.<init>(AbstractFileIOChannel.java:57) > > ... 7 more > > > > Best regards, > > Felix > > >
