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https://issues.apache.org/jira/browse/HADOOP-13288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15340470#comment-15340470
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Mingliang Liu commented on HADOOP-13288:
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Thank you [~cmccabe] for the review and commit!
> Guard null stats key in FileSystemStorageStatistics
> ---------------------------------------------------
>
> Key: HADOOP-13288
> URL: https://issues.apache.org/jira/browse/HADOOP-13288
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs
> Affects Versions: 2.8.0, 3.0.0-alpha1
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Fix For: 2.8.0
>
> Attachments: HADOOP-13288.000.patch, HADOOP-13288.001.patch
>
>
> Currently in {{FileSystemStorageStatistics}} we simply returns data from
> {{FileSystem#Statistics}}. However there is no null key check, which leads to
> NPE problems to downstream applications. For example, we got a NPE when
> passing a null key to {{FileSystemStorageStatistics#getLong()}}, exception
> stack as following:
> {quote}
> NullPointerException
> at
> org.apache.hadoop.fs.FileSystemStorageStatistics.fetch(FileSystemStorageStatistics.java:80)
> at
> org.apache.hadoop.fs.FileSystemStorageStatistics.getLong(FileSystemStorageStatistics.java:108)
> at
> org.apache.tez.runtime.metrics.FileSystemStatisticsUpdater2.updateCounters(FileSystemStatisticsUpdater2.java:60)
> at
> org.apache.tez.runtime.metrics.TaskCounterUpdater.updateCounters(TaskCounterUpdater.java:118)
> at
> org.apache.tez.runtime.RuntimeTask.setFrameworkCounters(RuntimeTask.java:172)
> at
> org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:100)
> at
> org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:37)
> at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> {quote}
> This jira is to add null stat key check to {{FileSystemStorageStatistics}}.
> Thanks [~hitesh] for trying in Tez and reporting this.
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