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https://issues.apache.org/jira/browse/HDFS-10803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16477571#comment-16477571
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Rushabh S Shah edited comment on HDFS-10803 at 5/16/18 3:23 PM:
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Any reason why this is just committed until branch-2.
This test failed in our internal build running head of branch-2.8
Any objections if I backport to branch-2.8 ?
was (Author: shahrs87):
Any reason why this is just committed to branch-2.
This test failed in our internal build running head of branch-2.8
Any objections if I backport to branch-2.8 ?
> 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
> Priority: Major
> Fix For: 3.1.0, 2.10.0
>
> 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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