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https://issues.apache.org/jira/browse/HDFS-8991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15359854#comment-15359854
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Mingliang Liu commented on HDFS-8991:
-------------------------------------
Thanks [~jnp] for the review and comment. For the mini-dfs cluster, the
hostname will be localhost and only one entry in the HA case.
Before this patch:
- Non-HA:
{code}
{"localhost":"BP-954094909-10.22.8.141-1467417399231"}
{code}
- HA:
{code}
{"localhost":"BP-21526920-10.22.8.141-1467417356425"}
{code}
After the patch:
- Non-HA:
{code}
{"BP-1939740699-10.22.8.141-1467416841045":{"localhost:57787":"active"}}
{code}
- HA:
{code}
{"BP-1698487347-10.22.8.141-1467417257785":{"localhost:57925":"active","localhost:57927":"standby"}}
{code}
> Provide information on BPOfferService in DN JMX
> -----------------------------------------------
>
> Key: HDFS-8991
> URL: https://issues.apache.org/jira/browse/HDFS-8991
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Haohui Mai
> Assignee: Mingliang Liu
> Attachments: HDFS-8991.000.patch, HDFS-8991.001.patch
>
>
> In cases like HDFS-7714 where the BPOfferService thread is missing, which
> require nontrivial effort to debug that which NN that the DN thinks it active
> / standby.
> It would make sense to make the information more accessible through JMX or
> Web UI.
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