Tianyi Wang created HDFS-13313:
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Summary: 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
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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