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https://issues.apache.org/jira/browse/HDFS-13836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Íñigo Goiri updated HDFS-13836:
-------------------------------
Summary: RBF: Handle the exception when the mount table znode has null
value (was: RBF: To handle the exception when the mounttable znode have null
value.)
> RBF: Handle the exception when the mount table znode has 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, HDFS-13836.005.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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