[SPARK-18744][CORE] Remove workaround for Netty memory leak
## What changes were proposed in this pull request? We added some codes in https://github.com/apache/spark/pull/14961 because of https://github.com/netty/netty/issues/5833 Now we can remove them as it's fixed in Netty 4.0.42.Final. ## How was this patch tested? Jenkins Author: Shixiong Zhu <shixiong@databricks.com> Closes #16167 from zsxwing/remove-netty-workaround.
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@ -24,11 +24,6 @@ import com.google.common.primitives.Ints;
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*/
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public class TransportConf {
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static {
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// Set this due to Netty PR #5661 for Netty 4.0.37+ to work
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System.setProperty("io.netty.maxDirectMemory", "0");
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}
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private final String SPARK_NETWORK_IO_MODE_KEY;
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private final String SPARK_NETWORK_IO_PREFERDIRECTBUFS_KEY;
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private final String SPARK_NETWORK_IO_CONNECTIONTIMEOUT_KEY;
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