gperinazzo opened a new issue #6131: Unable to upgrade bookie to 2.5.0 URL: https://github.com/apache/pulsar/issues/6131 **Describe the bug** When upgrading an existing 2.4.1 bookie cluster to 2.5.0 on kubernetes, the bookie fails to start with the following exception during initialization: `io.netty.util.internal.OutOfDirectMemoryError: failed to allocate 16777216 byte(s) of direct memory (used: 2147483648, max: 2147483648)` The node where the bookie was deployed has more than enough free memory. Rolling the bookie back to versions 2.4.1 or 2.4.2 allows the bookie to initialize successfully. **To Reproduce** Steps to reproduce the behavior: 1. Have an existing 2.4.1 bookie cluster on kuberentes 2. Update the image on the stateful set definition and set it to start in read only mode. 3. Restart one of the bookies to update the image version 4. See error on the bookie logs **Expected behavior** Upgrading a bookie should work **Additional context** [bookie.log](https://github.com/apache/pulsar/files/4104451/bookie.log)
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