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Posted to issues@spark.apache.org by "Yuriy Bondaruk (JIRA)" <ji...@apache.org> on 2018/01/31 17:47:02 UTC
[jira] [Created] (SPARK-23288) Incorrect number of written records
in structured streaming
Yuriy Bondaruk created SPARK-23288:
--------------------------------------
Summary: Incorrect number of written records in structured streaming
Key: SPARK-23288
URL: https://issues.apache.org/jira/browse/SPARK-23288
Project: Spark
Issue Type: Bug
Components: Structured Streaming
Affects Versions: 2.2.0
Reporter: Yuriy Bondaruk
I'm using SparkListener.onTaskEnd() to capture input and output metrics but it seems that number of written records ('taskEnd.taskMetrics().outputMetrics().recordsWritten()') is incorrect. Here is my stream construction:
{code:java}
StreamingQuery writeStream = session
.readStream()
.schema(RecordSchema.fromClass(TestRecord.class))
.option(OPTION_KEY_DELIMITER, OPTION_VALUE_DELIMITER_TAB)
.option(OPTION_KEY_QUOTE, OPTION_VALUE_QUOTATION_OFF)
.csv(inputFolder.getRoot().toPath().toString())
.as(Encoders.bean(TestRecord.class))
.flatMap(
((FlatMapFunction<TestRecord, TestVendingRecord>) (u) -> {
List<TestVendingRecord> resultIterable = new ArrayList<>();
try {
TestVendingRecord result = transformer.convert(u);
resultIterable.add(result);
} catch (Throwable t) {
System.err.println("Ooops");
t.printStackTrace();
}
return resultIterable.iterator();
}),
Encoders.bean(TestVendingRecord.class))
.writeStream()
.outputMode(OutputMode.Append())
.format("parquet")
.option("path", outputFolder.getRoot().toPath().toString())
.option("checkpointLocation", checkpointFolder.getRoot().toPath().toString())
.start();
writeStream.processAllAvailable();
writeStream.stop();
{code}
Tested it with one good and one bad (throwing exception in transformer.convert(u)) input records and it produces following metrics:
{code:java}
(TestMain.java:onTaskEnd(73)) - -----------status--> SUCCESS
(TestMain.java:onTaskEnd(75)) - -----------recordsWritten--> 0
(TestMain.java:onTaskEnd(76)) - -----------recordsRead-----> 2
(TestMain.java:onTaskEnd(83)) - taskEnd.taskInfo().accumulables():
(TestMain.java:onTaskEnd(84)) - name = duration total (min, med, max)
(TestMain.java:onTaskEnd(85)) - value = 323
(TestMain.java:onTaskEnd(84)) - name = number of output rows
(TestMain.java:onTaskEnd(85)) - value = 2
(TestMain.java:onTaskEnd(84)) - name = duration total (min, med, max)
(TestMain.java:onTaskEnd(85)) - value = 364
(TestMain.java:onTaskEnd(84)) - name = internal.metrics.input.recordsRead
(TestMain.java:onTaskEnd(85)) - value = 2
(TestMain.java:onTaskEnd(84)) - name = internal.metrics.input.bytesRead
(TestMain.java:onTaskEnd(85)) - value = 157
(TestMain.java:onTaskEnd(84)) - name = internal.metrics.resultSerializationTime
(TestMain.java:onTaskEnd(85)) - value = 3
(TestMain.java:onTaskEnd(84)) - name = internal.metrics.resultSize
(TestMain.java:onTaskEnd(85)) - value = 2396
(TestMain.java:onTaskEnd(84)) - name = internal.metrics.executorCpuTime
(TestMain.java:onTaskEnd(85)) - value = 633807000
(TestMain.java:onTaskEnd(84)) - name = internal.metrics.executorRunTime
(TestMain.java:onTaskEnd(85)) - value = 683
(TestMain.java:onTaskEnd(84)) - name = internal.metrics.executorDeserializeCpuTime
(TestMain.java:onTaskEnd(85)) - value = 55662000
(TestMain.java:onTaskEnd(84)) - name = internal.metrics.executorDeserializeTime
(TestMain.java:onTaskEnd(85)) - value = 58
(TestMain.java:onTaskEnd(89)) - input records 2
Streaming query made progress: {
"id" : "1231f9cb-b2e8-4d10-804d-73d7826c1cb5",
"runId" : "bd23b60c-93f9-4e17-b3bc-55403edce4e7",
"name" : null,
"timestamp" : "2018-01-26T14:44:05.362Z",
"numInputRows" : 2,
"processedRowsPerSecond" : 0.8163265306122448,
"durationMs" : {
"addBatch" : 1994,
"getBatch" : 126,
"getOffset" : 52,
"queryPlanning" : 220,
"triggerExecution" : 2450,
"walCommit" : 41
},
"stateOperators" : [ ],
"sources" : [ {
"description" : "FileStreamSource[file:/var/folders/4w/zks_kfls2s3glmrj3f725p7hllyb5_/T/junit3661035412295337071]",
"startOffset" : null,
"endOffset" : {
"logOffset" : 0
},
"numInputRows" : 2,
"processedRowsPerSecond" : 0.8163265306122448
} ],
"sink" : {
"description" : "FileSink[/var/folders/4w/zks_kfls2s3glmrj3f725p7hllyb5_/T/junit3785605384928624065]"
}
}
{code}
The number of inputs is correct but the number of output records taken from taskEnd.taskMetrics().outputMetrics().recordsWritten() is zero. Accumulables (taskEnd.taskInfo().accumulables()) don't have a correct value as well - should be 1 but it shows 2 'number of output rows'.
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