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https://issues.apache.org/jira/browse/FLINK-30259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17706805#comment-17706805
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Ran Tao commented on FLINK-30259:
---------------------------------
Hi [~chesnay] and [~twalthr] because currently some modules such as
flink-table/table-planner are doing some efforts like technical debt or
removing of deprecated code to meet the possible and new 2.0 version. Can we
do a clean about this assert usage. WDYT?
> Use flink Preconditions Util instead of uncertain Assert keyword to do
> checking
> -------------------------------------------------------------------------------
>
> Key: FLINK-30259
> URL: https://issues.apache.org/jira/browse/FLINK-30259
> Project: Flink
> Issue Type: Improvement
> Components: Deployment / Kubernetes, Formats (JSON, Avro, Parquet,
> ORC, SequenceFile), Table SQL / Planner
> Affects Versions: 1.16.0
> Reporter: Ran Tao
> Priority: Major
>
> The code of some modules of the current Flink project uses the 'assert'
> keyword of java to do checking, which actually depends on the enablement of
> the -enableassertions (-ea) option (default is false, which means some assert
> code can not work), otherwise it may lead to unexpected behavior. In fact,
> flink already has a mature Preconditions tool, we can use it to replace
> 'assert' keyword. it is more clean and consistent with flink.
> The following is an example of some snippets (by using idea, we can find
> other places ).
> RowDataPrintFunction
> {code:java}
> @Override
> public void invoke(RowData value, Context context) {
> Object data = converter.toExternal(value);
> assert data != null;
> writer.write(data.toString());
> }
> {code}
> e.g. if assert not enable,data.toString() will cause NPE.
> KubernetesUtils
> {code:java}
> public static KubernetesConfigMap checkConfigMaps(
> List<KubernetesConfigMap> configMaps, String
> expectedConfigMapName) {
> assert (configMaps.size() == 1);
> assert (configMaps.get(0).getName().equals(expectedConfigMapName));
> return configMaps.get(0);
> }
> {code}
> e.g. if assert not enable,configMaps.get(0)will cause NPE.
> RocksDBOperationUtils
> {code:java}
> if (memoryConfig.isUsingFixedMemoryPerSlot()) {
> assert memoryConfig.getFixedMemoryPerSlot() != null;
> logger.info("Getting fixed-size shared cache for RocksDB.");
> return memoryManager.getExternalSharedMemoryResource(
> FIXED_SLOT_MEMORY_RESOURCE_ID,
> allocator,
> // if assert not enable, here will cause NPE.
> memoryConfig.getFixedMemoryPerSlot().getBytes());
> } else {
> logger.info("Getting managed memory shared cache for
> RocksDB.");
> return memoryManager.getSharedMemoryResourceForManagedMemory(
> MANAGED_MEMORY_RESOURCE_ID, allocator,
> memoryFraction);
> }
> {code}
> e.g. if assert not enable,
> RocksDBOperationUtils#memoryConfig.getFixedMemoryPerSlot().getBytes()) will
> cause NPE.
> Note: many calcite classes use assert. we will not fix these classes. we just
> fix flink classes.
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