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Date: Fri, 26 Aug 2016 03:32:21 +0000 (UTC)
From: "Yiqun Lin (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-10803)
 TestBalancerWithMultipleNameNodes#testBalancing2OutOf3Blockpools fails
 intermittently due to no free space available
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archived-at: Fri, 26 Aug 2016 03:32:23 -0000


     [ https://issues.apache.org/jira/browse/HDFS-10803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yiqun Lin updated HDFS-10803:
-----------------------------
    Attachment: HDFS-10803.001.patch

> TestBalancerWithMultipleNameNodes#testBalancing2OutOf3Blockpools fails intermittently due to no free space available
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-10803
>                 URL: https://issues.apache.org/jira/browse/HDFS-10803
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>         Attachments: HDFS-10803.001.patch
>
>
> The test {{TestBalancerWithMultipleNameNodes#testBalancing2OutOf3Blockpools}} fails intermittently. The stack infos(https://builds.apache.org/job/PreCommit-HDFS-Build/16534/testReport/org.apache.hadoop.hdfs.server.balancer/TestBalancerWithMultipleNameNodes/testBalancing2OutOf3Blockpools/):
> {code}
> java.io.IOException: Creating block, no free space available
> 	at org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset$BInfo.<init>(SimulatedFSDataset.java:151)
> 	at org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset.injectBlocks(SimulatedFSDataset.java:580)
> 	at org.apache.hadoop.hdfs.MiniDFSCluster.injectBlocks(MiniDFSCluster.java:2679)
> 	at org.apache.hadoop.hdfs.server.balancer.TestBalancerWithMultipleNameNodes.unevenDistribution(TestBalancerWithMultipleNameNodes.java:405)
> 	at org.apache.hadoop.hdfs.server.balancer.TestBalancerWithMultipleNameNodes.testBalancing2OutOf3Blockpools(TestBalancerWithMultipleNameNodes.java:516)
> {code}
> The error message means that the datanode's capacity has used up and there is no other space to create a new file block. 
> I looked into the code, I found the main reason seemed that the {{capacities}}  for cluster is not correctly constructed in the second cluster startup before preparing to redistribute blocks in test.
> The related code:
> {code}
>       // Here we do redistribute blocks nNameNodes times for each node,
>       // we need to adjust the capacities. Otherwise it will cause the no 
>       // free space errors sometimes.
>       final MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
>           .nnTopology(MiniDFSNNTopology.simpleFederatedTopology(nNameNodes))
>           .numDataNodes(nDataNodes)
>           .racks(racks)
>           .simulatedCapacities(newCapacities)
>           .format(false)
>           .build();
>       LOG.info("UNEVEN 11");
>         ...
>         for(int n = 0; n < nNameNodes; n++) {
>           // redistribute blocks
>           final Block[][] blocksDN = TestBalancer.distributeBlocks(
>               blocks[n], s.replication, distributionPerNN);
>     
>           for(int d = 0; d < blocksDN.length; d++)
>             cluster.injectBlocks(n, d, Arrays.asList(blocksDN[d]));
>           LOG.info("UNEVEN 13: n=" + n);
>         }
> {code}
> And that means the totalUsed value has been increased as {{nNameNodes*usedSpacePerNN}} rather than {{usedSpacePerNN}}.



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