Hi Tianwang Li, 偶尔一两天出现 Checkpoint 超时，看下你的任务中，是否可能存在某类 key 在这一两天会突然增多的情况。
Best, LakeShen zhisheng <[email protected]> 于2020年6月28日周日 上午10:27写道： > hi, Tianwang Li > > 看到有三个图片挂了，可以试着把图片上传到第三方的图床，然后贴个链接过来，另外： > > > 任务经常会出现反压（特别是在窗口输出的时候） > > 这个检查一下窗口下游算子的情况，比如是不是窗口输出的数据过多，而 sink 的并发还和之前的保持一致，导致处理速度跟不上，从而导致的反压。 > > > > 大部分时候checkpoint都是在1分钟内完成，偶尔会出现checkpint需要超过30分钟的（出现的频率不高，1～2天1次） > > 这种也可以看看是不是 HDFS 有时候压力比较大导致的出现毛刺现象 > > 另外建议补一下 UI 上 chekcpoint 相关的截图和日志信息，这样才能更好的定位问题。 > > > Best ！ > zhisheng > > > Tianwang Li <[email protected]> 于2020年6月28日周日 上午10:17写道： > > > 关于Flink checkpoint偶尔会比较长时间的问题。 > > > > *环境与背景：* > > 版本：flink1.10.0 > > 数据量：每秒约10万左右的记录，数据源是kafka > > 计算逻辑：滑动窗口统计，每个窗口输出的规模大概1～2千万记录。 > > 是否有反压：任务经常会出现反压（特别是在窗口输出的时候）。 > > > > *问题：* > > 大部分时候checkpoint都是在1分钟内完成，偶尔会出现checkpint需要超过30分钟的（出现的频率不高，1～2天1次）。 > > source的checkpoint消耗的时间比较长。Trigger checkpoint 到 Starting > checkpoint消耗时间比较长。 > > > > checkpoint情况大致如下： > > > > [image: image.png] > > [image: image.png] > > [image: image.png] > > > > 2020-06-24 21:09:53,369 DEBUG > > org.apache.flink.runtime.taskexecutor.TaskExecutor - Trigger > > checkpoint 316@1593004193363 for 84dce1ec8aa5a4df2d1758d6e9278693. > > > > 2020-06-24 21:09:58,327 DEBUG > > org.apache.flink.runtime.taskexecutor.TaskExecutor - Received > > heartbeat request from e88ea2f790430c9c160e540ef0546d60. > > > > 2020-06-24 21:09:59,266 DEBUG > > org.apache.flink.runtime.taskexecutor.TaskExecutor - Received > > heartbeat request from b93d7167db364dfdcbda886944f1482f. > > > > 2020-06-24 21:09:59,686 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Memory usage stats: [HEAP: 202/2573/2573 MB, NON HEAP: > > 111/114/424 MB (used/committed/max)] > > > > 2020-06-24 21:09:59,686 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Direct memory stats: Count: 17403, Total Capacity: 583911423, > > Used Memory: 583911424 > > > > 2020-06-24 21:09:59,686 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Off-heap pool stats: [Code Cache: 35/35/240 MB > > (used/committed/max)], [Metaspace: 67/69/96 MB (used/committed/max)], > > [Compressed Class Space: 8/9/88 MB (used/committed/max)] > > > > 2020-06-24 21:09:59,686 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Garbage collector stats: [PS Scavenge, GC TIME (ms): 108643, GC > > COUNT: 6981], [PS MarkSweep, GC TIME (ms): 1074, GC COUNT: 6] > > > > 2020-06-24 21:10:08,346 DEBUG > > org.apache.flink.runtime.taskexecutor.TaskExecutor - Received > > heartbeat request from e88ea2f790430c9c160e540ef0546d60. > > > > 2020-06-24 21:10:09,286 DEBUG > > org.apache.flink.runtime.taskexecutor.TaskExecutor - Received > > heartbeat request from b93d7167db364dfdcbda886944f1482f. > > > > 2020-06-24 21:10:09,686 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Memory usage stats: [HEAP: 557/2573/2573 MB, NON HEAP: > > 111/114/424 MB (used/committed/max)] > > > > 2020-06-24 21:10:09,686 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Direct memory stats: Count: 17403, Total Capacity: 583911423, > > Used Memory: 583911424 > > > > 2020-06-24 21:10:09,686 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Off-heap pool stats: [Code Cache: 35/35/240 MB > > (used/committed/max)], [Metaspace: 67/69/96 MB (used/committed/max)], > > [Compressed Class Space: 8/9/88 MB (used/committed/max)] > > > > 2020-06-24 21:10:09,686 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Garbage collector stats: [PS Scavenge, GC TIME (ms): 108643, GC > > COUNT: 6981], [PS MarkSweep, GC TIME (ms): 1074, GC COUNT: 6] > > > > > > 省略。。。。 > > > > > > 2020-06-24 21:55:39,875 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Direct memory stats: Count: 17403, Total Capacity: 583911423, > > Used Memory: 583911424 > > > > 2020-06-24 21:55:39,875 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Off-heap pool stats: [Code Cache: 35/35/240 MB > > (used/committed/max)], [Metaspace: 67/69/96 MB (used/committed/max)], > > [Compressed Class Space: 8/9/88 MB (used/committed/max)] > > > > 2020-06-24 21:55:39,876 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Garbage collector stats: [PS Scavenge, GC TIME (ms): 110520, GC > > COUNT: 7083], [PS MarkSweep, GC TIME (ms): 1074, GC COUNT: 6] > > > > 2020-06-24 21:55:41,721 DEBUG > > org.apache.flink.streaming.runtime.tasks.StreamTask - Starting > > checkpoint (316) CHECKPOINT on task Source: Custom Source -> Map -> > Filter > > -> Timestamps/Watermarks (4/10) > > > > 2020-06-24 21:55:41,721 DEBUG > > org.apache.flink.runtime.state.AbstractSnapshotStrategy - > > DefaultOperatorStateBackend snapshot (FsCheckpointStorageLocation > > {fileSystem=org.apache.flink.core.fs.SafetyNetWrapperFileSystem@4a4b11cd > , > > checkpointDirectory=hdfs://xxxxchk-316, > > sharedStateDirectory=hdfs://xxxxshared, > > taskOwnedStateDirectory=hdfs://xxxxtaskowned, > > metadataFilePath=hdfs://xxxxchk-316/_metadata, reference=(default), > > fileStateSizeThreshold=1024, writeBufferSize=4096}, synchronous part) in > > thread Thread[Source: Custom Source -> Map -> Filter -> > > Timestamps/Watermarks (4/10),5,Flink Task Threads] took 0 ms. > > > > 2020-06-24 21:55:41,721 DEBUG > > org.apache.flink.runtime.state.AbstractSnapshotStrategy - > > DefaultOperatorStateBackend snapshot (FsCheckpointStorageLocation > > {fileSystem=org.apache.flink.core.fs.SafetyNetWrapperFileSystem@4a4b11cd > , > > checkpointDirectory=hdfs://xxxxchk-316, > > sharedStateDirectory=hdfs://xxxxshared, > > taskOwnedStateDirectory=hdfs://xxxxtaskowned, > > metadataFilePath=hdfs://xxxxchk-316/_metadata, reference=(default), > > fileStateSizeThreshold=1024, writeBufferSize=4096}, synchronous part) in > > thread Thread[Source: Custom Source -> Map -> Filter -> > > Timestamps/Watermarks (4/10),5,Flink Task Threads] took 0 ms. > > > > 2020-06-24 21:55:41,721 DEBUG > > org.apache.flink.runtime.state.AbstractSnapshotStrategy - > > DefaultOperatorStateBackend snapshot (FsCheckpointStorageLocation > > {fileSystem=org.apache.flink.core.fs.SafetyNetWrapperFileSystem@4a4b11cd > , > > checkpointDirectory=hdfs://xxxxchk-316, > > sharedStateDirectory=hdfs://xxxxshared, > > taskOwnedStateDirectory=hdfs://xxxxtaskowned, > > metadataFilePath=hdfs://xxxxchk-316/_metadata, reference=(default), > > fileStateSizeThreshold=1024, writeBufferSize=4096}, synchronous part) in > > thread Thread[Source: Custom Source -> Map -> Filter -> > > Timestamps/Watermarks (4/10),5,Flink Task Threads] took 0 ms. > > > > 2020-06-24 21:55:41,721 DEBUG > > org.apache.flink.runtime.state.AbstractSnapshotStrategy - > > DefaultOperatorStateBackend snapshot (FsCheckpointStorageLocation > > {fileSystem=org.apache.flink.core.fs.SafetyNetWrapperFileSystem@4a4b11cd > , > > checkpointDirectory=hdfs://xxxxchk-316, > > sharedStateDirectory=hdfs://xxxxshared, > > taskOwnedStateDirectory=hdfs://xxxxtaskowned, > > metadataFilePath=hdfs://xxxxchk-316/_metadata, reference=(default), > > fileStateSizeThreshold=1024, writeBufferSize=4096}, synchronous part) in > > thread Thread[Source: Custom Source -> Map -> Filter -> > > Timestamps/Watermarks (4/10),5,Flink Task Threads] took 0 ms. > > > > 2020-06-24 21:55:41,721 DEBUG > > org.apache.flink.streaming.runtime.tasks.StreamTask - Finished > > synchronous checkpoints for checkpoint 316 on task Source: Custom Source > -> > > Map -> Filter -> Timestamps/Watermarks (4/10) > > > > 2020-06-24 21:55:41,721 DEBUG > > org.apache.flink.streaming.runtime.tasks.StreamTask - Source: > > Custom Source -> Map -> Filter -> Timestamps/Watermarks (4/10) - finished > > synchronous part of checkpoint 316. Alignment duration: 0 ms, snapshot > > duration 0 ms > > > > 2020-06-24 21:55:41,737 DEBUG > > org.apache.flink.runtime.state.AbstractSnapshotStrategy - > > DefaultOperatorStateBackend snapshot (FsCheckpointStorageLocation > > {fileSystem=org.apache.flink.core.fs.SafetyNetWrapperFileSystem@4a4b11cd > , > > checkpointDirectory=hdfs://xxxxchk-316, > > sharedStateDirectory=hdfs://xxxxshared, > > taskOwnedStateDirectory=hdfs://xxxxtaskowned, > > metadataFilePath=hdfs://xxxxchk-316/_metadata, reference=(default), > > fileStateSizeThreshold=1024, writeBufferSize=4096}, asynchronous part) in > > thread Thread[AsyncOperations-thread-316,5,Flink Task Threads] took 16 > ms. > > > > 2020-06-24 21:55:41,738 DEBUG > > org.apache.flink.streaming.runtime.tasks.StreamTask - Source: > > Custom Source -> Map -> Filter -> Timestamps/Watermarks (4/10) - finished > > asynchronous part of checkpoint 316. Asynchronous duration: 16 ms > > > > 2020-06-24 21:55:42,008 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Received barrier from channel 3. > > > > 2020-06-24 21:55:42,008 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Starting stream alignment for > > checkpoint 316. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Received barrier from channel 7. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Received barrier from channel 2. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Received barrier from channel 8. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Received barrier from channel 6. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Received barrier from channel 0. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Received barrier from channel 5. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Received barrier from channel 9. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Received barrier from channel 4. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Received barrier from channel 1. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Received all barriers, triggering > > checkpoint 316 at 1593004193363. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.io.CheckpointBarrierAligner - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): End of stream alignment, feeding > > buffered data back. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.streaming.runtime.tasks.StreamTask - Starting > > checkpoint (316) CHECKPOINT on task > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.runtime.state.AbstractSnapshotStrategy - > > DefaultOperatorStateBackend snapshot (FsCheckpointStorageLocation > > {fileSystem=org.apache.flink.core.fs.SafetyNetWrapperFileSystem@61164119 > , > > checkpointDirectory=hdfs://xxxxchk-316, > > sharedStateDirectory=hdfs://xxxxshared, > > taskOwnedStateDirectory=hdfs://xxxxtaskowned, > > metadataFilePath=hdfs://xxxxchk-316/_metadata, reference=(default), > > fileStateSizeThreshold=1024, writeBufferSize=4096}, synchronous part) in > > thread Thread[Window(SlidingEventTimeWindows(10800000, 300000, 0), > > EventTimeTrigger, anon$11, ScalaProcessWindowFunctionWrapper) -> Map > > (10/10),5,Flink Task Threads] took 0 ms. > > > > 2020-06-24 21:55:42,110 DEBUG > > org.apache.flink.runtime.state.AbstractSnapshotStrategy - > > DefaultOperatorStateBackend snapshot (FsCheckpointStorageLocation > > {fileSystem=org.apache.flink.core.fs.SafetyNetWrapperFileSystem@61164119 > , > > checkpointDirectory=hdfs://xxxxchk-316, > > sharedStateDirectory=hdfs://xxxxshared, > > taskOwnedStateDirectory=hdfs://xxxxtaskowned, > > metadataFilePath=hdfs://xxxxchk-316/_metadata, reference=(default), > > fileStateSizeThreshold=1024, writeBufferSize=4096}, synchronous part) in > > thread Thread[Window(SlidingEventTimeWindows(10800000, 300000, 0), > > EventTimeTrigger, anon$11, ScalaProcessWindowFunctionWrapper) -> Map > > (10/10),5,Flink Task Threads] took 0 ms. > > > > 2020-06-24 21:55:42,980 DEBUG > > org.apache.flink.runtime.state.AbstractSnapshotStrategy - > > Asynchronous incremental RocksDB snapshot (FsCheckpointStorageLocation > > {fileSystem=org.apache.flink.core.fs.SafetyNetWrapperFileSystem@61164119 > , > > checkpointDirectory=hdfs://xxxx/chk-316, > > sharedStateDirectory=hdfs://xxxx/shared, > > taskOwnedStateDirectory=hdfs://xxxx/taskowned, > > metadataFilePath=hdfs://xxxx/chk-316/_metadata, reference=(default), > > fileStateSizeThreshold=1024, writeBufferSize=4096}, synchronous part) in > > thread Thread[Window(SlidingEventTimeWindows(10800000, 300000, 0), > > EventTimeTrigger, anon$11, ScalaProcessWindowFunctionWrapper) -> Map > > (10/10),5,Flink Task Threads] took 870 ms. > > > > 2020-06-24 21:55:42,981 DEBUG > > org.apache.flink.streaming.runtime.tasks.StreamTask - Finished > > synchronous checkpoints for checkpoint 316 on task > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > > > 2020-06-24 21:55:42,981 DEBUG > > org.apache.flink.streaming.runtime.tasks.StreamTask - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) - finished > > synchronous part of checkpoint 316. Alignment duration: 101 ms, snapshot > > duration 870 ms > > > > 2020-06-24 21:55:42,981 DEBUG > > org.apache.flink.streaming.runtime.io.CachedBufferStorage - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Size of buffered data: 98304 bytes > > > > 2020-06-24 21:55:42,981 DEBUG > > org.apache.flink.streaming.runtime.io.CachedBufferStorage - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) > > (a608e8a1ab75622dc57f164bdbb86743): Finished feeding back buffered data. > > > > 2020-06-24 21:55:43,814 DEBUG > > org.apache.flink.runtime.taskexecutor.TaskExecutor - Received > > heartbeat request from e88ea2f790430c9c160e540ef0546d60. > > > > 2020-06-24 21:55:44,758 DEBUG > > org.apache.flink.runtime.taskexecutor.TaskExecutor - Received > > heartbeat request from b93d7167db364dfdcbda886944f1482f. > > > > 2020-06-24 21:55:45,714 DEBUG > > org.apache.flink.runtime.state.AbstractSnapshotStrategy - > > Asynchronous incremental RocksDB snapshot (FsCheckpointStorageLocation > > {fileSystem=org.apache.flink.core.fs.SafetyNetWrapperFileSystem@61164119 > , > > checkpointDirectory=hdfs://xxxx/chk-316, > > sharedStateDirectory=hdfs://xxxx/shared, > > taskOwnedStateDirectory=hdfs://xxxx/taskowned, > > metadataFilePath=hdfs://xxxx/chk-316/_metadata, reference=(default), > > fileStateSizeThreshold=1024, writeBufferSize=4096}, asynchronous part) in > > thread Thread[AsyncOperations-thread-316,5,Flink Task Threads] took 2733 > ms. > > > > 2020-06-24 21:55:45,715 DEBUG > > org.apache.flink.streaming.runtime.tasks.StreamTask - > > Window(SlidingEventTimeWindows(10800000, 300000, 0), EventTimeTrigger, > > anon$11, ScalaProcessWindowFunctionWrapper) -> Map (10/10) - finished > > asynchronous part of checkpoint 316. Asynchronous duration: 2734 ms > > > > 2020-06-24 21:55:49,876 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Memory usage stats: [HEAP: 220/2589/2589 MB, NON HEAP: > > 111/114/424 MB (used/committed/max)] > > > > 2020-06-24 21:55:49,876 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Direct memory stats: Count: 17414, Total Capacity: 584128352, > > Used Memory: 584128353 > > > > 2020-06-24 21:55:49,876 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Off-heap pool stats: [Code Cache: 35/35/240 MB > > (used/committed/max)], [Metaspace: 67/69/96 MB (used/committed/max)], > > [Compressed Class Space: 8/9/88 MB (used/committed/max)] > > > > 2020-06-24 21:55:49,876 INFO > org.apache.flink.runtime.taskexecutor.TaskManagerRunner > > - Garbage collector stats: [PS Scavenge, GC TIME (ms): 110525, GC > > COUNT: 7084], [PS MarkSweep, GC TIME (ms): 1074, GC COUNT: 6] > > > > > > -- > > ************************************** > > tivanli > > ************************************** > > >
