[jira] [Created] (HDFS-10329) Bad initialisation of StringBuffer in RequestHedgingProxyProvider.java

["Max Schaefer (JIRA)" <ji...@apache.org>]

Max Schaefer created HDFS-10329:
-----------------------------------

             Summary: Bad initialisation of StringBuffer in RequestHedgingProxyProvider.java
                 Key: HDFS-10329
                 URL: https://issues.apache.org/jira/browse/HDFS-10329
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: ha
            Reporter: Max Schaefer
            Priority: Minor


On [line 167|https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.java#L167] of {{RequestHedgingProxyProvider.java}}, a {{StringBuilder}} is initialised like this:

{code}
StringBuilder combinedInfo = new StringBuilder('[');
{code}

This won't have the (presumably) desired effect of creating a {{StringBuilder}} containing the string {{"["}}; instead, it will create a {{StringBuilder}} with capacity 91 (the character code of '['). See [here|http://what-when-how.com/Tutorial/topic-90315a/Java-Puzzlers-Traps-Pitfalls-and-Corner-Cases-69.html] for an explanation.

To fix this, pass a string literal instead of the character literal:

{code}
StringBuilder combinedInfo = new StringBuilder("[");
{code}



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