k-raina commented on code in PR #20144:
URL: https://github.com/apache/kafka/pull/20144#discussion_r2254377927
##########
clients/src/main/java/org/apache/kafka/common/telemetry/internals/ClientTelemetryReporter.java:
##########
@@ -713,14 +716,20 @@ private Optional<Builder<?>>
createPushRequest(ClientTelemetrySubscription local
return Optional.empty();
}
- CompressionType compressionType =
ClientTelemetryUtils.preferredCompressionType(localSubscription.acceptedCompressionTypes());
+ CompressionType compressionType =
ClientTelemetryUtils.preferredCompressionType(localSubscription.acceptedCompressionTypes(),
unsupportedCompressionTypes);
ByteBuffer compressedPayload;
try {
compressedPayload = ClientTelemetryUtils.compress(payload,
compressionType);
- } catch (Throwable e) {
- log.debug("Failed to compress telemetry payload for
compression: {}, sending uncompressed data", compressionType);
- compressedPayload = ByteBuffer.wrap(payload.toByteArray());
- compressionType = CompressionType.NONE;
+ } catch (Throwable e) {
+ if (e instanceof IOException || e instanceof
NoClassDefFoundError ||
Review Comment:
For ZSTD:
```
ClientTelemetryUtils.compress() [Line 206]
└── Compression.of(ZSTD).build()
└── ZstdCompression.Builder.build() [Line 138]
└── new ZstdCompression(level)
└── throws NoClassDefFoundError:
com/github/luben/zstd/BufferPool
❌ Exception escapes - no try-catch at this level
```
```
// ZstdCompression.java - External libraries imported at the top
import com.github.luben.zstd.BufferPool; // ← These imports
import com.github.luben.zstd.RecyclingBufferPool; // ← cause problems
import com.github.luben.zstd.ZstdInputStreamNoFinalizer;
import com.github.luben.zstd.ZstdOutputStreamNoFinalizer;
```
When Java tries to load the ZstdCompression class, it immediately tries to
find all the imported classes. If the ZSTD library is missing, Java throws
NoClassDefFoundError right away - before Kafka can catch it. Similarly for
Snappy class also.
For LZ4:
```
ClientTelemetryUtils.compress() [Line 207]
└── Compression.of(LZ4).build()
└── Lz4Compression.Builder.build() [Line 138] ✅ No lz4 native library
└── compression.wrapForOutput()
└── Lz4Compression.wrapForOutput() [Line 49]
└── try {
└── new Lz4BlockOutputStream(...)
└── NoClassDefFoundError: net/jpountz/lz4/LZ4Factory
└── } catch (Throwable e) {
└── throw new KafkaException(e) ❌ Exception wrapped
└── }
```
```
// Lz4Compression.java - NO external library imports at the top
import org.apache.kafka.common.KafkaException;
import org.apache.kafka.common.record.CompressionType;
// ... only Kafka's own classes imported
```
The Lz4Compression class loads fine. External LZ4 classes are only accessed
later when actually needed during compression.wrapForOutput call.
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