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https://issues.apache.org/jira/browse/HDFS-13313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDFS-13313:
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Labels: pull-request-available (was: )
> FSEditLogOp.toString() throws NullPointerException
> --------------------------------------------------
>
> Key: HDFS-13313
> URL: https://issues.apache.org/jira/browse/HDFS-13313
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.0.2
> Reporter: Tianyi Wang
> Priority: Minor
> Labels: pull-request-available
>
> In some subclasses of FSEditLogOp, toString() [uses dot (.) operator on some
> could-be-null
> fields|https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogOp.java#L3896].
> Those fields could be set to null by
> [resetSubFields()|https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogOp.java#L3857].
> This error can be hit by turning on debug logging: toString() is called in
> [FSEditLogAsync.logSync()|https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogAsync.java#L128]
> with debug logging and reset() is called in
> [doEditTransaction()|https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLog.java#L484]
> when the operation is executed asynchronously.
> Proposed change: Avoid "field of field" access in toString() and use
> StringBuilder.append(field) because those fields have toString() themselves,
> and it would append "null" to the string if 'field' is null.
>
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