baeminbo commented on code in PR #17201:
URL: https://github.com/apache/beam/pull/17201#discussion_r845919183
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runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/IsmReaderImpl.java:
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@@ -370,7 +373,7 @@ boolean bloomFilterMightContain(RandomAccessData keyBytes) {
position(rawChannel, footer.getBloomFilterPosition());
bloomFilter =
ScalableBloomFilterCoder.of().decode(Channels.newInputStream(rawChannel));
- indexPerShard = new HashMap<>();
+ indexPerShard = new ConcurrentHashMap<>();
Review Comment:
Actually, any Map supporting thread-safe put/get is ok for `indexPerShard`
(e.g. `Hashtable`).
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