pnowojski 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_r354413036
##########
File path:
flink-core/src/main/java/org/apache/flink/configuration/NettyShuffleEnvironmentOptions.java
##########
@@ -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:
On another note... what if someone wants to use compression just for
`BlockingBoundedPartitions`? Actually that could be a sane/valid default: `LZ4`
for partitions being written to disk and `NONE` for pipelined?
```
taskmanager.network.bounded-blocking-subpartition.compression: NONE/LZ4
(default LZ4?)
taskmanager.network.compression: NONE/LZ4 (defaul NONE?)
```
For example, are you sure that your motivating example for the compression
won't be slowed down in some cases if compression is enabled for all types of
partitions?
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