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https://issues.apache.org/jira/browse/HDFS-12905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16281269#comment-16281269
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Virajith Jalaparti commented on HDFS-12905:
-------------------------------------------
All operations are done under the FSNamesytem write lock.
{code}
+ public void notifyDatanodeStateChange(DatanodeDescriptor node) {
+ assert lock.hasWriteLock(): "FSNamesystem lock has to be held";
+ if (providedEnabled && node.hasStorageType(StorageType.PROVIDED)) {
+ providedDescriptor.notifyStateChange(node);
+ }
+ }
{code}
> [READ] Handle decommissioning and under-maintenance Datanodes with Provided
> storage.
> ------------------------------------------------------------------------------------
>
> Key: HDFS-12905
> URL: https://issues.apache.org/jira/browse/HDFS-12905
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Virajith Jalaparti
> Assignee: Virajith Jalaparti
> Attachments: HDFS-12905-HDFS-9806.001.patch
>
>
> {{ProvidedStorageMap}} doesn't keep track of the state of the datanodes with
> Provided storage. As a result, it can return nodes that are being
> decommissioned or under-maintenance even when live datanodes exist. This JIRA
> is to prefer live datanodes to datanodes in other states.
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