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Diffstat (limited to 'docs/configuration.md')
| -rw-r--r-- | docs/configuration.md | 36 |
1 files changed, 12 insertions, 24 deletions
diff --git a/docs/configuration.md b/docs/configuration.md index 541695c83a..c8db338cb6 100644 --- a/docs/configuration.md +++ b/docs/configuration.md @@ -903,36 +903,24 @@ Apart from these, the following properties are also available, and may be useful <td><code>spark.akka.heartbeat.pauses</code></td> <td>6000</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). Acceptable heart beat pause - in seconds for akka. This can be used to control sensitivity to gc pauses. Tune this in - combination of `spark.akka.heartbeat.interval` and `spark.akka.failure-detector.threshold` - if you need to. - </td> -</tr> -<tr> - <td><code>spark.akka.failure-detector.threshold</code></td> - <td>300.0</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). This maps to akka's - `akka.remote.transport-failure-detector.threshold`. Tune this in combination of - `spark.akka.heartbeat.pauses` and `spark.akka.heartbeat.interval` if you need to. + This is set to a larger value to disable the transport failure detector that comes built in to Akka. + It can be enabled again, if you plan to use this feature (Not recommended). Acceptable heart + beat pause in seconds for Akka. This can be used to control sensitivity to GC pauses. Tune + this along with `spark.akka.heartbeat.interval` if you need to. </td> </tr> <tr> <td><code>spark.akka.heartbeat.interval</code></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 the transport failure detector that comes built in to 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` if you need + to. A likely positive use case for using failure detector would be: a sensistive failure detector + can help evict rogue executors quickly. 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. </td> </tr> <tr> |