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https://issues.apache.org/jira/browse/HDFS-14172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16755160#comment-16755160
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Yiqun Lin commented on HDFS-14172:
----------------------------------
[~water], just take a quick look for this , I prefer to use the way
[~adam.antal] commented.
{code}
SectionName sectionName = SectionName.fromString(n);
if (sectionName == null) {
LOG.warn("Unrecognized section {}", n);
} else {
switch(sectionName) {
case NS_INFO:
loadNameSystemSection(in);
break;
...
}
}
{code}
It will be a safe change and can avoid the potential NPE..
> Return a default SectionName to avoid NPE
> -----------------------------------------
>
> Key: HDFS-14172
> URL: https://issues.apache.org/jira/browse/HDFS-14172
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Xiang Li
> Assignee: Xiang Li
> Priority: Minor
> Attachments: HADOOP-14172.000.patch, HADOOP-14172.001.patch
>
>
> In FSImageFormatProtobuf.SectionName#fromString(), as follows:
> {code:java}
> public static SectionName fromString(String name) {
> for (SectionName n : values) {
> if (n.name.equals(name))
> return n;
> }
> return null;
> }
> {code}
> When the code meets an unknown section from the fsimage, the function will
> return null. Callers always operates the return value with a "switch" clause,
> like FSImageFormatProtobuf.Loader#loadInternal(), as:
> {code:java}
> switch (SectionName.fromString(n))
> {code}
> NPE will be thrown here.
> For self-protection, shall we add a default section name in the enum of
> SectionName, like "UNKNOWN", to steer clear of NPE?
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