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Apache Spark commented on SPARK-4715: ------------------------------------- User 'zsxwing' has created a pull request for this issue: https://github.com/apache/spark/pull/3575 > ShuffleMemoryManager.tryToAcquire may return a negative value > ------------------------------------------------------------- > > Key: SPARK-4715 > URL: https://issues.apache.org/jira/browse/SPARK-4715 > Project: Spark > Issue Type: Bug > Components: Spark Core > Reporter: Shixiong Zhu > > Here is a unit test to demonstrate it: > {code} > test("threads should not be granted a negative size") { > val manager = new ShuffleMemoryManager(1000L) > manager.tryToAcquire(700L) > val latch = new CountDownLatch(1) > startThread("t1") { > manager.tryToAcquire(300L) > latch.countDown() > } > latch.await() // Wait until `t1` calls `tryToAcquire` > val granted = manager.tryToAcquire(300L) > assert(0 === granted, "granted is negative") > } > {code} > It outputs "0 did not equal -200 granted is negative" -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org