Rakesh R created HDFS-10720:
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Summary: Fix intermittent test failure of
TestDataNodeErasureCodingMetrics#testEcTasks
Key: HDFS-10720
URL: https://issues.apache.org/jira/browse/HDFS-10720
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Rakesh R
Assignee: Rakesh R
The test is wrongly finding out the datanode to be corrupted from the block
locations. Instead of finding out a datanode which is used in the block
locations it is simply getting a datanode from the cluster, which may not be a
datanode present in the block locations.
{code}
byte[] indices = lastBlock.getBlockIndices();
//corrupt the first block
DataNode toCorruptDn = cluster.getDataNodes().get(indices[0]);
{code}
For example, datanodes in the cluster.getDataNodes() array indexed like,
0->Dn1, 1->Dn2, 2->Dn3, 3->Dn4, 4->Dn5, 5->Dn6, 6->Dn7, 7->Dn8, 8->Dn9, 9->Dn10
Assume the datanodes which are part of block location is => Dn2, Dn3, Dn4, Dn5,
Dn6, Dn7, Dn8, Dn9, Dn10. Now, in the failed scenario, it is getting the
corrupted datanode as cluster.getDataNodes().get(0) which will be Dn1 and
corruption of this datanode will not result in ECWork and is failing the tests.
Ideally, the test should find a datanode from the block locations and corrupt
it, that will trigger ECWork.
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