Confluent JDBC Source Connect在转换中提供了NullPointerException

问题描述 投票：0回答：1

这真的很奇怪。在我的数据库中，当我执行此SQL时：

select count(*) from mySchema.myTable where some_col = '2'

结果是：26000000

[当连接器配置中的QUERY设置为此并且我运行连接器时：

QUERY="select * from mySchema.myTable where some_col = '2' order by primary_key, sec_key limit 26000000"

连接器没有问题，我可以使用所有消息。

但是，当连接器配置中的QUERY设置为此并且我运行连接器时：

QUERY="select * from mySchema.myTable where some_col = '2' order by primary_key, sec_key"

连接器给我这个例外：

[2019-12-23 22:51:16,671] ERROR WorkerSourceTask{id=HIVE_JDBC_BATCH_SOURCE-0} Task threw an uncaught and unrecoverable exception (org.apache.kafka.connect.runtime.WorkerTask:177)
org.apache.kafka.connect.errors.ConnectException: Tolerance exceeded in error handler
                at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndHandleError(RetryWithToleranceOperator.java:178)
                at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execute(RetryWithToleranceOperator.java:104)
                at org.apache.kafka.connect.runtime.TransformationChain.apply(TransformationChain.java:50)
                at org.apache.kafka.connect.runtime.WorkerSourceTask.sendRecords(WorkerSourceTask.java:293)
                at org.apache.kafka.connect.runtime.WorkerSourceTask.execute(WorkerSourceTask.java:229)
                at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:175)
                at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:219)
                at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
                at java.util.concurrent.FutureTask.run(FutureTask.java:266)
                at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
                at java.lang.Thread.run(Thread.java:748)

Caused by: java.lang.NullPointerException
                at org.apache.kafka.connect.transforms.ValueToKey.applyWithSchema(ValueToKey.java:85)
                at org.apache.kafka.connect.transforms.ValueToKey.apply(ValueToKey.java:65)
                at org.apache.kafka.connect.runtime.TransformationChain.lambda$apply$0(TransformationChain.java:50)
                at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndRetry(RetryWithToleranceOperator.java:128)
                at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndHandleError(RetryWithToleranceOperator.java:162)
                ... 11 more

这里是配置：

[[2019-12-23 22：51：00,681] INFO ConnectorConfig值：

    config.action.reload = restart
    connector.class = io.confluent.connect.jdbc.JdbcSourceConnector
    errors.log.enable = false
    errors.log.include.messages = false
    errors.retry.delay.max.ms = 60000
    errors.retry.timeout = 0
    errors.tolerance = none
    header.converter = null
    key.converter = class org.apache.kafka.connect.storage.StringConverter
    name = HIVE_JDBC_BATCH_SOURCE
    tasks.max = 8
    transforms = [createKey, extractString]
    value.converter = class org.apache.kafka.connect.json.JsonConverter

[[2019-12-23 22：51：00,681] INFO EnrichedConnectorConfig值：

    config.action.reload = restart
    connector.class = io.confluent.connect.jdbc.JdbcSourceConnector
    errors.log.enable = false
    errors.log.include.messages = false
    errors.retry.delay.max.ms = 60000
    errors.retry.timeout = 0
    errors.tolerance = none
    header.converter = null
    key.converter = class org.apache.kafka.connect.storage.StringConverter
    name = HIVE_JDBC_BATCH_SOURCE
    tasks.max = 8
    transforms = [createKey, extractString]
    transforms.createKey.fields = [mySchema.primary_key]
    transforms.createKey.type = class org.apache.kafka.connect.transforms.ValueToKey
    transforms.extractString.field = mySchema.primary_key
    transforms.extractString.type = class org.apache.kafka.connect.transforms.ExtractField$Key
    value.converter = class org.apache.kafka.connect.json.JsonConverter

[[2019-12-23 22：51：00,686] INFO StringConverterConfig值：

    converter.encoding = UTF8
    converter.type = key

[[2019-12-23 22：51：00,686] INFO JsonConverterConfig值：

    converter.type = value
    schemas.cache.size = 1000
    schemas.enable = false

[[2019-12-23 22：51：00,701] INFO ProducerConfig值：

    acks = all
    batch.size = 100000
    bootstrap.servers = xxx
    buffer.memory = 33554432
    client.dns.lookup = default
    client.id = 
    compression.type = none
    connections.max.idle.ms = 540000
    delivery.timeout.ms = 2147483647
    enable.idempotence = false
    interceptor.classes = []
    key.serializer = class org.apache.kafka.common.serialization.ByteArraySerializer
    linger.ms = 10
    max.block.ms = 9223372036854775807
    max.in.flight.requests.per.connection = 1
    max.request.size = 10485760
    metadata.max.age.ms = 300000
    metric.reporters = []
    metrics.num.samples = 2
    metrics.recording.level = INFO
    metrics.sample.window.ms = 30000
    partitioner.class = class org.apache.kafka.clients.producer.internals.DefaultPartitioner
    receive.buffer.bytes = 32768
    reconnect.backoff.max.ms = 1000
    reconnect.backoff.ms = 50
    request.timeout.ms = 310000
    retries = 2147483647
    retry.backoff.ms = 100

[[2019-12-23 22：51：00,810] INFO JdbcSourceTaskConfig值：

    batch.max.rows = 100
    catalog.pattern = null
    connection.attempts = 5
    connection.backoff.ms = 60000
    connection.password = null
    connection.url = xxx
    connection.user = null
    db.timezone = UTC
    dialect.name = 
    incrementing.column.name = 
    mode = bulk
    numeric.mapping = null
    numeric.precision.mapping = false
    poll.interval.ms = 86400000
    query = select * from mySchema.myTable where some_col = '2' order by primary_key, sec_key
    quote.sql.identifiers = ALWAYS
    schema.pattern = mySchema
    table.blacklist = []
    table.poll.interval.ms = 60000
    table.types = [TABLE]
    table.whitelist = []
    tables = []
    timestamp.column.name = []
    timestamp.delay.interval.ms = 0
    topic.prefix = my_topic
    validate.non.null = false

来自数据库表的样本数据：

primary_key 2C58131FF9680D5632CB1FDC27675490

sec_key 3EE

year_cd 1

year_month 201911

content_txt 2016-10-072016-10-12MEMOREX1234500172409430291.52

连接器产生的示例消息：

{“ mySchema.primary_key”：“ 2C58131FF9680D5632CB1FDC27675490”，“ mySchema.sec_key”：“ 3EE”，“ mySchema.year_cd”：“ 1”，“ mySchema.year_month”：“ 201911”，“ mySchema.content_txt”：“ 2016-10-072016-10-12MEMOREX1234500172409430291.52“}

apache-kafka apache-kafka-connect confluent
1个回答
0
投票
我能够找到该错误（IMO，JDBC SourceConnector中的错误）

当查询具有'LIMIT子句'时，连接器生成的示例消息：

{“ mySchema.primary_key”：“ 2C58131FF9680D5632CB1FDC27675490”，“ mySchema.sec_key”：“ 3EE”，“ mySchema.year_cd”：“ 1”，“ mySchema.year_month”：“ 201911”，“ mySchema.content_txt”：“ 2016-10-072016-10-12MEMOREX1234500172409430291.52“}

当查询中没有'LIMIT子句'时，连接器生成的示例消息：

{“ primary_key”：“ 2C58131FF9680D5632CB1FDC27675490”，“ sec_key”：“ 3EE”，“ year_cd”：“ 1”，“ year_month”：“ 201911”，“ content_txt”：“ 2016-10-072016-10-12MEMOREX1234500172409430291。 52“}

当设置是这样时：transforms.extractString.field = mySchema.primary_key连接器将引发NullPointerException，因此我将设置更改为：transforms.extractString.field = primary_key它就像一个魅力。

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