Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/9373#discussion_r44595545
--- Diff:
streaming/src/test/scala/org/apache/spark/streaming/util/WriteAheadLogSuite.scala
---
@@ -582,6 +620,9 @@ object WriteAheadLogSuite {
allowBatching: Boolean): Seq[String] = {
val wal = createWriteAheadLog(logDirectory, closeFileAfterWrite,
allowBatching)
val data = wal.readAll().asScala.map(byteBufferToString).toSeq
+ // The thread pool for parallel recovery gets killed with wal.close().
Therefore we need to
+ // eagerly compute data, otherwise the lazy computation will fail.
+ data.length
--- End diff --
Could you just change `toSeq` to `toArray`? `toArray` will drain the
Iterator at once.
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