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https://issues.apache.org/jira/browse/HDFS-17609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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farmmamba resolved HDFS-17609.
------------------------------
Resolution: Duplicate
> [FGL] Fix lock mode in some RPC
> -------------------------------
>
> Key: HDFS-17609
> URL: https://issues.apache.org/jira/browse/HDFS-17609
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: farmmamba
> Assignee: farmmamba
> Priority: Major
> Labels: pull-request-available
>
> * FSNamesystem#getFilesBlockingDecom ： use GLOBAL mode rather than FS mode
> because of below codes:
> ```java
> for (DatanodeDescriptor dataNode :
> blockManager.getDatanodeManager().getDatanodes()) {
> }
> ```
>
> * FSNamesystem#listOpenFiles: use GLOBAL mode because it calls
> getFilesBlockingDecom method.
> * FSNamesystem#getContentSummary： use GLOBAL mode rather than FS mode
> because it calls computeFileSize method.
> * BlockManagerSafeMode#leaveSafeMode： use GLOBAL mode rather than BM mode
> because it calls startSecretManagerIfNecessary which depended upon FS lock.
> Change to GLOBAL mode is safe here.
>
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