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Date: Fri, 1 Sep 2017 03:14:01 +0000 (UTC)
From: "Weiwei Yang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13097909.1503909216000.5493.1504235641243@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-12367) Ozone: Too many open files error
 while running corona
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archived-at: Fri, 01 Sep 2017 03:14:10 -0000


    [ https://issues.apache.org/jira/browse/HDFS-12367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16149974#comment-16149974 ] 

Weiwei Yang commented on HDFS-12367:
------------------------------------

Thanks [~nandakumar131], I will do some more tests with HDFS-12382 and to verify if this issue is completely resolved. Thanks for the hint.

> Ozone: Too many open files error while running corona
> -----------------------------------------------------
>
>                 Key: HDFS-12367
>                 URL: https://issues.apache.org/jira/browse/HDFS-12367
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone, tools
>            Reporter: Weiwei Yang
>            Assignee: Mukul Kumar Singh
>
> Too many open files error keeps happening to me while using corona, I have simply setup a single node cluster and run corona to generate 1000 keys, but I keep getting following error
> {noformat}
> ./bin/hdfs corona -numOfThreads 1 -numOfVolumes 1 -numOfBuckets 1 -numOfKeys 1000
> 17/08/28 00:47:42 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
> 17/08/28 00:47:42 INFO tools.Corona: Number of Threads: 1
> 17/08/28 00:47:42 INFO tools.Corona: Mode: offline
> 17/08/28 00:47:42 INFO tools.Corona: Number of Volumes: 1.
> 17/08/28 00:47:42 INFO tools.Corona: Number of Buckets per Volume: 1.
> 17/08/28 00:47:42 INFO tools.Corona: Number of Keys per Bucket: 1000.
> 17/08/28 00:47:42 INFO rpc.OzoneRpcClient: Creating Volume: vol-0-05000, with wwei as owner and quota set to 1152921504606846976 bytes.
> 17/08/28 00:47:42 INFO tools.Corona: Starting progress bar Thread.
> ...
> ERROR tools.Corona: Exception while adding key: key-251-19293 in bucket: bucket-0-34960 of volume: vol-0-05000.
> java.io.IOException: Exception getting XceiverClient.
> 	at org.apache.hadoop.scm.XceiverClientManager.getClient(XceiverClientManager.java:156)
> 	at org.apache.hadoop.scm.XceiverClientManager.acquireClient(XceiverClientManager.java:122)
> 	at org.apache.hadoop.ozone.client.io.ChunkGroupOutputStream.getFromKsmKeyInfo(ChunkGroupOutputStream.java:289)
> 	at org.apache.hadoop.ozone.client.rpc.OzoneRpcClient.createKey(OzoneRpcClient.java:487)
> 	at org.apache.hadoop.ozone.tools.Corona$OfflineProcessor.run(Corona.java:352)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at java.lang.Thread.run(Thread.java:745)
> Caused by: com.google.common.util.concurrent.UncheckedExecutionException: java.lang.IllegalStateException: failed to create a child event loop
> 	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2234)
> 	at com.google.common.cache.LocalCache.get(LocalCache.java:3965)
> 	at com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4764)
> 	at org.apache.hadoop.scm.XceiverClientManager.getClient(XceiverClientManager.java:144)
> 	... 9 more
> Caused by: java.lang.IllegalStateException: failed to create a child event loop
> 	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:68)
> 	at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
> 	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
> 	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
> 	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:44)
> 	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:36)
> 	at org.apache.hadoop.scm.XceiverClient.connect(XceiverClient.java:76)
> 	at org.apache.hadoop.scm.XceiverClientManager$2.call(XceiverClientManager.java:151)
> 	at org.apache.hadoop.scm.XceiverClientManager$2.call(XceiverClientManager.java:145)
> 	at com.google.common.cache.LocalCache$LocalManualCache$1.load(LocalCache.java:4767)
> 	at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3568)
> 	at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2350)
> 	at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2313)
> 	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2228)
> 	... 12 more
> Caused by: io.netty.channel.ChannelException: failed to open a new selector
> 	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
> 	at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
> 	at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
> 	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64)
> 	... 25 more
> Caused by: java.io.IOException: Too many open files
> 	at sun.nio.ch.EPollArrayWrapper.epollCreate(Native Method)
> 	at sun.nio.ch.EPollArrayWrapper.<init>(EPollArrayWrapper.java:130)
> 	at sun.nio.ch.EPollSelectorImpl.<init>(EPollSelectorImpl.java:69)
> 	at sun.nio.ch.EPollSelectorProvider.openSelector(EPollSelectorProvider.java:36)
> 	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
> 	... 28 more
> {noformat}


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