Manoj Govindassamy created HDFS-11267:
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Summary: 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
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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