diff options
-rw-r--r-- | core/src/main/scala/org/apache/spark/executor/TaskMetrics.scala | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/core/src/main/scala/org/apache/spark/executor/TaskMetrics.scala b/core/src/main/scala/org/apache/spark/executor/TaskMetrics.scala index 0b4892f98f..c0ce46e379 100644 --- a/core/src/main/scala/org/apache/spark/executor/TaskMetrics.scala +++ b/core/src/main/scala/org/apache/spark/executor/TaskMetrics.scala @@ -61,50 +61,53 @@ object TaskMetrics { class ShuffleReadMetrics extends Serializable { /** - * Time when shuffle finishs + * Absolute time when this task finished reading shuffle data */ var shuffleFinishTime: Long = _ /** - * Total number of blocks fetched in a shuffle (remote or local) + * Number of blocks fetched in this shuffle by this task (remote or local) */ var totalBlocksFetched: Int = _ /** - * Number of remote blocks fetched in a shuffle + * Number of remote blocks fetched in this shuffle by this task */ var remoteBlocksFetched: Int = _ /** - * Local blocks fetched in a shuffle + * Number of local blocks fetched in this shuffle by this task */ var localBlocksFetched: Int = _ /** - * Total time that is spent blocked waiting for shuffle to fetch data + * Time the task spent waiting for remote shuffle blocks. This only includes the time + * blocking on shuffle input data. For instance if block B is being fetched while the task is + * still not finished processing block A, it is not considered to be blocking on block B. */ var fetchWaitTime: Long = _ /** - * The total amount of time for all the shuffle fetches. This adds up time from overlapping - * shuffles, so can be longer than task time + * Total time spent fetching remote shuffle blocks. This aggregates the time spent fetching all + * input blocks. Since block fetches are both pipelined and parallelized, this can + * exceed fetchWaitTime and executorRunTime. */ var remoteFetchTime: Long = _ /** - * Total number of remote bytes read from a shuffle + * Total number of remote bytes read from the shuffle by this task */ var remoteBytesRead: Long = _ } class ShuffleWriteMetrics extends Serializable { /** - * Number of bytes written for a shuffle + * Number of bytes written for the shuffle by this task */ var shuffleBytesWritten: Long = _ /** - * Time spent blocking on writes to disk or buffer cache, in nanoseconds. + * Time the task spent blocking on writes to disk or buffer cache, in nanoseconds */ var shuffleWriteTime: Long = _ } |