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https://issues.apache.org/jira/browse/HDFS-13836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16591092#comment-16591092
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yanghuafeng commented on HDFS-13836:
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>From my side, it is essential to keep the logs. We can get the specific
>information about the errors.
{quote}
For the asserts, I think we can use assertNull and assertNotNull.
{quote}
use assertNull and assertNotNull to replace assertTrue
{quote}
Should we generate the fake records in a higher level way?
{quote}
simple to use the "test" node
{quote}
We should do: String nodeName = StateStoreUtils.getRecordName(recordClass);
{quote}
done
Please review again. [~elgoiri]
> RBF: To handle the exception when the mounttable znode have null value.
> -----------------------------------------------------------------------
>
> Key: HDFS-13836
> URL: https://issues.apache.org/jira/browse/HDFS-13836
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: federation, hdfs
> Affects Versions: 3.1.0
> Reporter: yanghuafeng
> Assignee: yanghuafeng
> Priority: Major
> Fix For: 2.9.0, 3.0.0, 3.1.0, 3.2.0
>
> Attachments: HDFS-13836.001.patch, HDFS-13836.002.patch,
> HDFS-13836.003.patch, HDFS-13836.004.patch
>
>
> When we are adding the mounttable entry, the router sever is terminated.
> Some error messages show in log, as follow:
> 2018-08-20 14:18:32,404 ERROR
> org.apache.hadoop.hdfs.server.federation.store.driver.impl.StateStoreZooKeeperImpl:
> Cannot get data for 0SLASH0testzk: null.
> The reason is that router server have created the znode but not to set data
> before being terminated. But the method zkManager.getStringData(path, stat)
> will throw NPE if the path has null value in the StateStoreZooKeeperImpl,
> leading to fail in adding the same mounttable entry and deleting the existing
> znode.
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