Github user revans2 commented on a diff in the pull request:
https://github.com/apache/storm/pull/1029#discussion_r50273025
--- Diff: storm-core/src/jvm/org/apache/storm/trident/Stream.java ---
@@ -57,6 +57,23 @@
import org.apache.storm.trident.state.StateUpdater;
import org.apache.storm.trident.util.TridentUtils;
+/**
+ * A Stream represents the core data model in Trident, and can be thought
of as a "stream" of tuples that are processed
+ * as a series of small batches. A stream is partitioned accross the nodes
in the in the cluster, and operations are
+ * applied to a stream in parallel accross each partition.
+ *
+ * There are five types of operations that can be performed on streams in
Trident
+ *
+ * 1. **Partiton-Local Operations** - Operations that are applied locally
to each partition and do not involve network
+ * transfer
+ * 2. **Repartitioning Operations** - Operations that that change how
tuples are partitioned across tasks(thus causing
--- End diff --
`Operations that *that* change` extra that
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