jun-he edited a comment on issue #726: Improve multi-threading in BaseRewriteManifests URL: https://github.com/apache/incubator-iceberg/issues/726#issuecomment-583285403 @aokolnychyi Here, the thread pool used in `performRewrite` seems to be a shared one (https://github.com/apache/incubator-iceberg/blob/master/core/src/main/java/org/apache/iceberg/util/ThreadPools.java#L60). If the same BaseRewriteManifests object's `apply` method was called twice at the same time, it is possible that the same WriterWrapper object was accessed by two different threads in this shared thread pool. A more complex way is to create a thread worker pool, where each worker has its own WriterWrapper inside.
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