Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/7943#discussion_r36873941
--- Diff:
network/shuffle/src/main/java/org/apache/spark/network/shuffle/ExternalShuffleBlockResolver.java
---
@@ -252,4 +338,118 @@ public String toString() {
.toString();
}
}
+
+ static ObjectMapper mapper = new ObjectMapper();
+
+ private static byte[] dbAppExecKey(AppExecId appExecId) throws
IOException {
+ // we stick a common prefix on all the keys so we can find them in the
DB
+ String appExecJson = mapper.writeValueAsString(appExecId);
+ String key = (APP_KEY_PREFIX + ";" + appExecJson);
--- End diff --
yeah, its used for pulling data out of leveldb. We seek to keys that start
w/ this prefix, and scan as long as the key still has the prefix.
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