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https://issues.apache.org/jira/browse/ZOOKEEPER-2422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267315#comment-15267315
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Sergey Maslyakov commented on ZOOKEEPER-2422:
---------------------------------------------
Please review the changes. Existing test cases have been updated to account for
the new fields.
Sample output with the changes applied (*3.4 branch*):
{noformat}
$ echo mntr | nc localhost 2181
zk_version 3.4.9-SNAPSHOT-1741982, built on 05/02/2016 17:07 GMT
zk_avg_latency 0
zk_max_latency 0
zk_min_latency 0
zk_packets_received 1
zk_packets_sent 0
zk_num_alive_connections 1
zk_outstanding_requests 0
zk_server_state standalone
zk_znode_count 4
zk_watch_count 0
zk_ephemerals_count 0
zk_approximate_data_size 27
zk_max_memory 468189184
zk_total_memory 32505856
zk_free_memory 29894696
zk_jvm_instance_id 28517@evol-vbox
zk_jvm_start_time 1462216238928
zk_open_file_descriptor_count 25
zk_max_file_descriptor_count 1048576
{noformat}
Sample output with the changes applied (*3.5 branch*):
{noformat}
$ echo mntr | nc localhost 2181
zk_version 3.5.2-alpha-SNAPSHOT-1741982, built on 05/02/2016 17:32 GMT
zk_avg_latency 0
zk_max_latency 0
zk_min_latency 0
zk_packets_received 1
zk_packets_sent 0
zk_num_alive_connections 1
zk_outstanding_requests 0
zk_server_state standalone
zk_znode_count 5
zk_watch_count 0
zk_ephemerals_count 0
zk_approximate_data_size 44
zk_max_memory 932184064
zk_total_memory 32505856
zk_free_memory 25264352
zk_jvm_instance_id 28575@evol-vbox
zk_jvm_start_time 1462216541236
zk_open_file_descriptor_count 39
zk_max_file_descriptor_count 1048576
{noformat}
Sample output with the changes applied (*trunk*):
{noformat}
$ echo mntr | nc localhost 2181
zk_version 3.6.0-SNAPSHOT-1741987, built on 05/02/2016 18:17 GMT
zk_avg_latency 0
zk_max_latency 0
zk_min_latency 0
zk_packets_received 1
zk_packets_sent 0
zk_num_alive_connections 1
zk_outstanding_requests 0
zk_server_state standalone
zk_znode_count 5
zk_watch_count 0
zk_ephemerals_count 0
zk_approximate_data_size 44
zk_max_memory 932184064
zk_total_memory 32505856
zk_free_memory 25298232
zk_jvm_instance_id 28639@evol-vbox
zk_jvm_start_time 1462216628188
zk_open_file_descriptor_count 39
zk_max_file_descriptor_count 1048576
{noformat}
> Improve health reporting by adding heap stats
> ---------------------------------------------
>
> Key: ZOOKEEPER-2422
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2422
> Project: ZooKeeper
> Issue Type: Improvement
> Affects Versions: 3.4.8, 3.4.9, 3.5.1, 3.5.2, 3.6.0
> Reporter: Sergey Maslyakov
> Fix For: 3.4.8, 3.4.9, 3.5.1, 3.5.2, 3.6.0
>
> Attachments: zookeeper-2422-3.4.patch, zookeeper-2422-3.5.patch,
> zookeeper-2422-3.6.patch
>
>
> In order to improve remote monitoring of the ZooKeeper instance using tools
> like Icinga/NRPE, it is very desirable to expose JVM heap stats via a
> light-weight interface. The "mntr" 4lw is a good candidate for this.
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