Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/6912#discussion_r33114226
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/ClientWrapper.scala ---
@@ -136,12 +137,62 @@ private[hive] class ClientWrapper(
// TODO: should be a def?s
// When we create this val client, the HiveConf of it (conf) is the one
associated with state.
- private val client = Hive.get(conf)
+ @GuardedBy("this")
+ private var client = Hive.get(conf)
+
+ // We use hive's conf for compatibility.
+ private val retryLimit =
conf.getIntVar(HiveConf.ConfVars.METASTORETHRIFTFAILURERETRIES)
+ private val retryDelayMillis =
shim.getMetastoreClientConnectRetryDelayMillis(conf)
+
+ /**
+ * Runs `f` with multiple retries in case the hive metastore is
temporarily unreachable.
+ */
+ private def retryLocked[A](f: => A): A = synchronized {
+ // Hive sometimes retries internally, so set a deadline to avoid
compounding delays.
+ val deadline = System.nanoTime + (retryLimit * retryDelayMillis *
1e6).toLong
+ var numTries = 0
+ var caughtException: Exception = null
+ do {
+ numTries += 1
+ try {
+ return f
+ } catch {
+ case e: Exception if causedByThrift(e) =>
+ caughtException = e
+ logWarning(
+ "HiveClientWrapper got thrift exception, destroying client and
retrying " +
+ s"(${retryLimit - numTries} tries remaining)", e)
+ Thread.sleep(retryDelayMillis)
+ try {
+ client = Hive.get(conf, true)
--- End diff --
Done
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