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https://issues.apache.org/jira/browse/HDFS-14037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16751953#comment-16751953
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Takanobu Asanuma commented on HDFS-14037:
-----------------------------------------
I implemented SSLConnectionConfigurator class instead of
{{URLConnectionFactory#newSslConnConfigurator}}. Both override
{{ConnectionConfigurator#configure}}, and both {{configure()}} methods are only
called in {{URLConnectionFactory#openConnection}}. Are not they the same?
> Fix SSLFactory truststore reloader thread leak in URLConnectionFactory
> ----------------------------------------------------------------------
>
> Key: HDFS-14037
> URL: https://issues.apache.org/jira/browse/HDFS-14037
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client, webhdfs
> Reporter: Takanobu Asanuma
> Assignee: Takanobu Asanuma
> Priority: Major
> Attachments: HDFS-14037.1.patch, HDFS-14037.2.patch
>
>
> This is reported by [~yoshiata]. It is a similar issue as HADOOP-11368 and
> YARN-5309 in URLConnectionFactory.
> {quote}SSLFactory in newSslConnConfigurator and subsequently creates the
> ReloadingX509TrustManager instance which in turn starts a trust store
> reloader thread.
> However, the SSLFactory is never destroyed and hence the trust store reloader
> threads are not killed.
> {quote}
> We observed many leaked threads when we used swebhdfs via NiFi cluster.
> {noformat}
> "Truststore reloader thread" Id=221 TIMED_WAITING on null
> at java.lang.Thread.sleep(Native Method)
> at
> org.apache.hadoop.security.ssl.ReloadingX509TrustManager.run(ReloadingX509TrustManager.java:189)
> at java.lang.Thread.run(Thread.java:748)
> {noformat}
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