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Diffstat (limited to 'docs/tuning.md')
| -rw-r--r-- | docs/tuning.md | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/docs/tuning.md b/docs/tuning.md index a8fe7a4532..e73ed69ffb 100644 --- a/docs/tuning.md +++ b/docs/tuning.md @@ -114,7 +114,7 @@ variety of workloads without requiring user expertise of how memory is divided i Although there are two relevant configurations, the typical user should not need to adjust them as the default values are applicable to most workloads: -* `spark.memory.fraction` expresses the size of `M` as a fraction of the total JVM heap space +* `spark.memory.fraction` expresses the size of `M` as a fraction of the (JVM heap space - 300MB) (default 0.75). The rest of the space (25%) is reserved for user data structures, internal metadata in Spark, and safeguarding against OOM errors in the case of sparse and unusually large records. |