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https://issues.apache.org/jira/browse/HDFS-10885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15601317#comment-15601317
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Rakesh R commented on HDFS-10885:
---------------------------------
Thanks [~zhouwei], [~umamaheswararao] for the dscussions.
bq. How about we use mover id file for communicating this.
Since both the process are distributed {{/system/mover.id} based logic would
work well. Presently {{Mover tool}} is writing the host name details into this
file, this could be used for logging inside SPS to know the already running
instance.
{code}
NameNodeConnector#checkAndMarkRunning()
fsout.writeBytes(InetAddress.getLocalHost().getHostName());
{code}
bq. Anyway HSM is already depending on Xattr for storing policy ids.
Exactly, SPS has dependency with Xattr, so we could do a check during SPS
startup as well.
Adding another point to consider, dynamically enable/disable SPS without making
NN restart. Are you planning to address this use case as part of this jira.
> [SPS]: Mover tool should not be allowed to run when Storage Policy Satisfier
> is on
> ----------------------------------------------------------------------------------
>
> Key: HDFS-10885
> URL: https://issues.apache.org/jira/browse/HDFS-10885
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, namenode
> Affects Versions: HDFS-10285
> Reporter: Wei Zhou
> Assignee: Wei Zhou
> Fix For: HDFS-10285
>
> Attachments: HDFS-10800-HDFS-10885-00.patch,
> HDFS-10800-HDFS-10885-01.patch, HDFS-10800-HDFS-10885-02.patch,
> HDFS-10885-HDFS-10285.03.patch, HDFS-10885-HDFS-10285.04.patch
>
>
> These two can not work at the same time to avoid conflicts and fight with
> each other.
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