Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/119#discussion_r10506244
--- Diff: docs/configuration.md ---
@@ -375,7 +376,7 @@ Apart from these, the following properties are also
available, and may be useful
<td>spark.akka.heartbeat.interval</td>
<td>1000</td>
<td>
- This is set to a larger value to disable failure detector that comes
inbuilt akka. It can be enabled again, if you plan to use this feature (Not
recommended). A larger interval value in seconds reduces network overhead and a
smaller value ( ~ 1 s) might be more informative for akka's failure detector.
Tune this in combination of `spark.akka.heartbeat.pauses` and
`spark.akka.failure-detector.threshold` if you need to. Only positive use case
for using failure detector can be, a sensistive failure detector can help evict
rogue executors really quick. However this is usually not the case as gc pauses
and network lags are expected in a real spark cluster. Apart from that enabling
this leads to a lot of exchanges of heart beats between nodes leading to
flooding the network with those.
+ This is set to a larger value to disable failure detector that comes
inbuilt akka. It can be enabled again, if you plan to use this feature (Not
recommended). A larger interval value in seconds reduces network overhead and a
smaller value ( ~ 1 s) might be more informative for akka's failure detector.
Tune this in combination of `spark.akka.heartbeat.pauses` and
`spark.akka.failure-detector.threshold` if you need to. Only positive use case
for using failure detector can be, a sensistive failure detector can help evict
rogue executors really quick. However this is usually not the case as gc pauses
and network lags are expected in a real spark cluster. Apart from that enabling
this leads to a lot of exchanges of heart beats between nodes leading to
flooding the network with those.
--- End diff --
False change?
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