dongjoon-hyun commented on code in PR #59074:
URL: https://github.com/apache/spark/pull/59074#discussion_r4136184468
##########
core/src/main/scala/org/apache/spark/internal/config/History.scala:
##########
@@ -165,18 +165,25 @@ private[spark] object History {
.bytesConf(ByteUnit.BYTE)
.createWithDefaultString("1m")
+ val EVENT_LOG_MAX_LINE_LENGTH_LIMIT: Int = 512 * 1024 * 1024
+
val EVENT_LOG_MAX_LINE_LENGTH =
ConfigBuilder("spark.history.fs.eventLog.maxLineLength")
- .doc("Maximum length of a single event log line during replay. Lines
longer than " +
- "this are skipped with a warning instead of being read into memory,
bounding the " +
- "memory replay can use when an event log is corrupt or unexpectedly
large. Setting " +
- "this to 0 or a negative value disables the limit. " +
+ .doc("Maximum UTF-8 byte length of a single event log line during
replay, excluding " +
+ "the line ending. Longer lines are skipped with a warning, bounding
the " +
+ "memory replay can use when an event log is corrupt or unexpectedly
large. Buffer " +
+ "growth, UTF-16 storage and JSON parsing can require several times
this limit in heap " +
+ "space. Buffer capacity grows in steps: reducing 256m to 200m or 150m
may not reduce " +
+ "the retained buffer; use 128m to reach a smaller capacity. Values at
or below 0, " +
+ s"or above $EVENT_LOG_MAX_LINE_LENGTH_LIMIT, use the maximum supported
limit of " +
+ s"$EVENT_LOG_MAX_LINE_LENGTH_LIMIT bytes (512 MiB). This cap avoids
JVM array-size " +
+ "limits but does not guarantee sufficient heap space. " +
"Introduced in 4.3.0; also available in 3.5.10, 4.0.5, 4.1.4 and
4.2.1; and in " +
"all versions after 4.3.0.")
.version("4.3.0")
Review Comment:
Actually, I'm not sure about that. Both different versions and `3.5.10`
sounds misleading to me. However, if there is any precedence, I don't care.
> Note that I found the backport PRs of
[SPARK-59407](https://issues.apache.org/jira/browse/SPARK-59407) fills this
.version field of this config with the version number in each branch, i.e.,
.version("4.1.4") on branch-4.1 backport, .version("3.5.10") on branch-3.5
backport.
cc @holdenk for looping the author of that backport.
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