smengcl commented on code in PR #11617:
URL: https://github.com/apache/ozone/pull/11617#discussion_r4308744057
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hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/scm/ScmConfig.java:
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@@ -102,6 +102,17 @@ public class ScmConfig extends ReconfigurableConfig {
)
private String ecPipelineChoosePolicyName;
+ @Config(key = "hdds.scm.block.allocation.prefer.client.local",
+ type = ConfigType.BOOLEAN,
+ defaultValue = "false",
+ tags = { ConfigTag.SCM, ConfigTag.PIPELINE, ConfigTag.PERFORMANCE },
+ description = "If true, when allocating a Ratis block for a client that
runs on a datanode host, SCM prefers "
+ + "an open pipeline that contains that datanode, so one replica is
local to the writer (like the HDFS "
+ + "first replica). Falls back to the pipeline choose policy when no
such pipeline has a usable container. "
+ + "OM reads the same key to pass the client address to SCM on every
block allocation."
+ )
+ private boolean preferClientLocalPipeline;
Review Comment:
Open question to reviewers: Should this be made the default?
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