dxichen opened a new pull request #1587:
URL: https://github.com/apache/samza/pull/1587
**Symptom**: We see the following when writing a large checkpoint to disk
```
Caused by: java.io.UTFDataFormatException
at
java.io.ObjectOutputStream$BlockDataOutputStream.writeUTF(ObjectOutputStream.java:2164)
~[?:1.8.0_282]
at
java.io.ObjectOutputStream$BlockDataOutputStream.writeUTF(ObjectOutputStream.java:2007)
~[?:1.8.0_282]
at java.io.ObjectOutputStream.writeUTF(ObjectOutputStream.java:869)
~[?:1.8.0_282]
at org.apache.samza.util.FileUtil.writeWithChecksum(FileUtil.scala:45)
~[samza-core_2.11-317.1071.9.4.jar:317.1071.9.4]
at
org.apache.samza.storage.StorageManagerUtil.writeCheckpointV2File(StorageManagerUtil.java:245)
```
**Cause**: FileUtil uses `ObjectOutputStream$BlockDataOutputStream.writeUTF`
which limits the size to 0xFFFF and throws `UTFDataFormatException` if the
length is greater
**Changes**: Chunked data larger than 0xFFFF into individual writes allowing
larger data size support, as well backwards compatibility
**Tests**: Added unit test for backward compatibility and large message
testing
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