Kafka 流状态目录 io 错误

Question

流运行一定时间后给出以下错误？我找不到谁负责创建 .sst 文件？

环境：

卡夫卡版本 0.10.0-cp1

Scala 2.11.8

    org.apache.kafka.streams.errors.ProcessorStateException: Error while executing flush from store agg
        at org.apache.kafka.streams.state.internals.RocksDBStore.flushInternal(RocksDBStore.java:424)
        at org.apache.kafka.streams.state.internals.RocksDBStore.flush(RocksDBStore.java:414)
        at org.apache.kafka.streams.state.internals.MeteredKeyValueStore.flush(MeteredKeyValueStore.java:165)
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:330)
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:247)
        at org.apache.kafka.streams.processor.internals.StreamThread.commitOne(StreamThread.java:446)
        at org.apache.kafka.streams.processor.internals.StreamThread.commitAll(StreamThread.java:434)
        at org.apache.kafka.streams.processor.internals.StreamThread.maybeCommit(StreamThread.java:422)
        at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:340)
        at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:218)
Caused by: org.rocksdb.RocksDBException: IO error: /tmp/kafka-streams/pos/0_0/rocksdb/agg/000008.sst: No such file or directory
        at org.rocksdb.RocksDB.flush(Native Method)
        at org.rocksdb.RocksDB.flush(RocksDB.java:1329)
        at org.apache.kafka.streams.state.internals.RocksDBStore.flushInternal(RocksDBStore.java:422)
        ... 9 more
[2016-06-24 11:13:54,910] ERROR Failed to commit StreamTask #0_0 in thread [StreamThread-1]:  (org.apache.kafka.streams.processor.internals.StreamThread:452)
org.apache.kafka.streams.errors.ProcessorStateException: Error while batch writing to store agg
        at org.apache.kafka.streams.state.internals.RocksDBStore.putAllInternal(RocksDBStore.java:324)
        at org.apache.kafka.streams.state.internals.RocksDBStore.flushCache(RocksDBStore.java:379)
        at org.apache.kafka.streams.state.internals.RocksDBStore.flush(RocksDBStore.java:411)
        at org.apache.kafka.streams.state.internals.MeteredKeyValueStore.flush(MeteredKeyValueStore.java:165)
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:330)
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:247)
        at org.apache.kafka.streams.processor.internals.StreamThread.commitOne(StreamThread.java:446)
        at org.apache.kafka.streams.processor.internals.StreamThread.commitAll(StreamThread.java:434)
        at org.apache.kafka.streams.processor.internals.StreamThread.shutdown(StreamThread.java:248)
        at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:228)
Caused by: org.rocksdb.RocksDBException: IO error: /tmp/kafka-streams/pos/0_0/rocksdb/agg/000008.sst: No such file or directory
        at org.rocksdb.RocksDB.write0(Native Method)
        at org.rocksdb.RocksDB.write(RocksDB.java:546)
        at org.apache.kafka.streams.state.internals.RocksDBStore.putAllInternal(RocksDBStore.java:322)
        ... 9 more

Answer 1

Kafka Streams 在内部使用 RocksDB 来处理操作符状态——并且 RocksDB 将一些文件写入磁盘。

是否有可能有人删除了/tmp文件夹中的内容，从而删除了您的 Kafka Streams 应用程序的状态？如果是，state.dir请使用参数配置不同的状态存储位置（请参阅http://docs.confluent.io/current/streams/developer-guide.html#optional-configuration-parameters）