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https://issues.apache.org/jira/browse/HDFS-11267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Manoj Govindassamy updated HDFS-11267:
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Attachment: HDFS-11267.01.patch
Attaching v01 patch to address the following:
1. Avoid storageDirs getting re-defined in NNStorage. The redefinition is not
needed as HDFS-11251 is anyway making the parent member variable stroageDir a
{{CopyOnWriteArrayList}}
2. Make {{Storage#storageDirs}} a private member and expose get() method for
the same.
3. Clean up all direct accessors of storageDirs with getStorageDirs() method
[~eddyxu], can you please take a look at the patch ?
> Avoid redefinition of storageDirs in NNStorage and cleanup its accessors in
> Storage
> -----------------------------------------------------------------------------------
>
> Key: HDFS-11267
> URL: https://issues.apache.org/jira/browse/HDFS-11267
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.0.0-alpha1
> Reporter: Manoj Govindassamy
> Assignee: Manoj Govindassamy
> Attachments: HDFS-11267.01.patch
>
>
> In the abstract class {{Storage}}, {{storageDirs}} is a protected variable
> and all its derived classes like {{NNStorage}}, {{JNStorage}},
> {{DataStorage}}.. are iterating over this non-thread safe variable without
> any proper locks. Any parallel modification operation like add or remove
> volume can mutate the backing storageDirs list and any iterators on this list
> around the same time can face {{ConcurrentModificationException}}. It would
> be good to make the variable private and restrict the access via getters and
> setters. Any thread safe restriction need to be done can then be placed on
> the parent class only.
> Also, {{NNStorage}} redefines parent class Storage's {{storageDirs}}, making
> it inconsistent with other derived classes. Would be cleaner if {{NNStorage}}
> can avoid re-defining it locally.
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