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https://issues.apache.org/jira/browse/HDFS-11251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15765882#comment-15765882
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Yiqun Lin commented on HDFS-11251:
----------------------------------
Thanks [~manojg] for the analysis. I think that's the reason of the failure
case.
{quote}
Want to look at logs to find the parallel operations on the storageDir
{quote}
Here it's the {{addVolume}} operation caused this as you can see the stack info
that [~jlowe] provided above. Hope this can help you.
{code}
org.apache.hadoop.conf.ReconfigurationException: Could not change property
dfs.datanode.data.dir from
'[DISK]file:/testptch/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/4/dfs/data/data1,[DISK]file:/testptch/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/4/dfs/data/data2,[DISK]file:/testptch/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/4/dfs/data/data4'
to
'[DISK]file:/testptch/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/4/dfs/data/data1,[DISK]file:/testptch/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/4/dfs/data/data2,[DISK]file:/testptch/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/4/dfs/data/data3,[DISK]file:/testptch/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/4/dfs/data/data4'
at
org.apache.hadoop.hdfs.server.datanode.DataNode.refreshVolumes(DataNode.java:777)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.reconfigurePropertyImpl(DataNode.java:532)
at
org.apache.hadoop.hdfs.server.datanode.TestDataNodeHotSwapVolumes.addVolumes(TestDataNodeHotSwapVolumes.java:310)
at
org.apache.hadoop.hdfs.server.datanode.TestDataNodeHotSwapVolumes.testAddVolumesDuringWrite(TestDataNodeHotSwapVolumes.java:404)
{code}
> ConcurrentModificationException during DataNode#refreshVolumes
> --------------------------------------------------------------
>
> Key: HDFS-11251
> URL: https://issues.apache.org/jira/browse/HDFS-11251
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.0.0-alpha2
> Reporter: Jason Lowe
> Assignee: Manoj Govindassamy
>
> The testAddVolumesDuringWrite case failed with a ReconfigurationException
> which appears to have been caused by a ConcurrentModificationException.
> Stacktrace details to follow.
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