wsry commented on a change in pull request #10375: [FLINK-14845][runtime]
Introduce data compression to reduce disk and network IO of shuffle.
URL: https://github.com/apache/flink/pull/10375#discussion_r354702467
##########
File path:
flink-core/src/main/java/org/apache/flink/configuration/NettyShuffleEnvironmentOptions.java
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@@ -54,6 +54,28 @@
.withDescription("Enable SSL support for the
taskmanager data transport. This is applicable only when the" +
" global flag for internal SSL (" +
SecurityOptions.SSL_INTERNAL_ENABLED.key() + ") is set to true");
+ /**
+ * Boolean flag indicating whether the shuffle data will be compressed
or not.
+ *
+ * <p>Note: Data is compressed per buffer (may be sliced buffer in
pipeline mode) and compression can incur extra
+ * CPU overhead so it is more effective for IO bounded scenario when
data compression ratio is high.
+ */
+ public static final ConfigOption<Boolean> DATA_COMPRESSION_ENABLED =
+ key("taskmanager.data.compression.enabled")
Review comment:
I am a little afraid that when we make it pluggable in the future, the "LZ4"
config value can be dropped and users already using compression may have to
change their configurations. Currently, the codec config option is not
documented and we can change it to any other values in the future when we make
it pluggable in the future.
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