Ji Liu created ARROW-6898:
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Summary: [Java] Fix potential memory leak in ArrowWriter and
several test classes
Key: ARROW-6898
URL: https://issues.apache.org/jira/browse/ARROW-6898
Project: Apache Arrow
Issue Type: Bug
Components: Java
Reporter: Ji Liu
Assignee: Ji Liu
ARROW-6040 fixed the problem that dictionary entries are required in IPC
streams even when empty, which only writes dictionaries when there are at least
one batch. In this way, if we write empty stream and invoke ArrowWriter#close,
the dictionaries are not closed leading to memory leak (they are closed after
the write operation), and it’s really hard to debug, this problem was found by
{{TestArrowReaderWriter#testEmptyStreamInStreamingIPC}} when I tried to close
allocator after the test.
Besides, there are several test classes have potential memory leak without
closing allocator/vector/buf etc.
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