virajjasani commented on a change in pull request #754: HBASE-22978 : Online
slow response log
URL: https://github.com/apache/hbase/pull/754#discussion_r382535946
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File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
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@@ -590,6 +596,10 @@ public HRegionServer(final Configuration conf) throws
IOException {
this.abortRequested = false;
this.stopped = false;
+ // initiate online slowlog ringbuffer only for RegionServers
+ if (!(this instanceof HMaster)) {
Review comment:
If we don't initialize this and if user tries to retrieve
get_slow_responses, request can't go to `SlowLogRecorder`. We should let the
request go there and return empty response since queue is empty. And when user
realize that he is getting empty response because he has not enabled required
config, he will enable it, in fact he can enable it dynamically. Dynamic config
support is also on the way in follow up task. So, we should initialize this
object and let the object determine if queue is to be created based on config
and if so, what is the size limit of queue etc.
`HRegionServer` is not the one to decide queue creation, `SlowLogRecorder`
is the one :)
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