steveloughran commented on code in PR #3206:
URL: https://github.com/apache/parquet-java/pull/3206#discussion_r2070178775
##########
parquet-hadoop/src/main/java/org/apache/parquet/hadoop/util/HadoopPositionOutputStream.java:
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@@ -61,8 +62,13 @@ public void flush() throws IOException {
@Override
public void close() throws IOException {
+ if (closed) {
Review Comment:
safest to use an atomic bool here
```
if (closed.getAndSet(true) {
return;
}
```
streams are nominally not thread safe, but cross stream use happens. Making
close() itself thread safe is low cost and avoids problems on cleanup
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