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[FLINK-14123]Update help docs for OutOfMemoryError #278

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[FLINK-14123]Update help docs for OutOfMemoryError #278

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9 changes: 9 additions & 0 deletions gettinghelp.md
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Expand Up @@ -131,3 +131,12 @@ Hadoop version of the cluster you want to connect to (HDFS / YARN).

The easiest way to fix that is to pick a Hadoop-free Flink version and simply export the Hadoop path and
classpath from the cluster.

### I have an OutOfMemoryError

In Fink 1.9.0 and prior version, the managed memory fraction of taskmanager is controlled by `taskmanager.memory.fraction`,
and with 0.7 as the default value. This sometimes will cause OOMs due to the fact that the default value of
JVM parameter `NewRatio` is 2, which means the old generation occupied only 2/3 (0.66) of the heap memory.
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In Fink 1.9.0 and prior version, the managed memory fraction of taskmanager is controlled by `taskmanager.memory.fraction`,
and with 0.7 as the default value. This sometimes will cause OOMs due to the fact that the default value of
JVM parameter `NewRatio` is 2, which means the old generation occupied only 2/3 (0.66) of the heap memory.
In Flink 1.9.0 and prior versions, the managed memory fraction of the taskmanager is controlled by `taskmanager.memory.fraction`,
with 0.7 as the default value. This will sometimes cause OOMs because the default value of the
JVM parameter `NewRatio` is 2, which means that the old generation occupied only 2/3 (0.66) of the heap memory.


If you run into this case, please try to manually change this value to a lower value.