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https://issues.apache.org/jira/browse/IMPALA-10236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Quanlong Huang updated IMPALA-10236:
------------------------------------
Target Version: Impala 4.1 (was: Impala 4.0)
> Queries stuck if catalog topic update compression fails
> -------------------------------------------------------
>
> Key: IMPALA-10236
> URL: https://issues.apache.org/jira/browse/IMPALA-10236
> Project: IMPALA
> Issue Type: Bug
> Components: Catalog
> Affects Versions: Impala 2.12.0
> Reporter: Shant Hovsepian
> Priority: Critical
> Labels: hang, supportability
>
> If a to be compressed Catalog Object doesn't fit into a 2GB buffer, an error
> is thrown.
>
> {code:java}
> /// Compresses a serialized catalog object using LZ4 and stores it back in
> 'dst'. Stores
> /// the size of the uncompressed catalog object in the first sizeof(uint32_t)
> bytes of
> /// 'dst'. The compression fails if the uncompressed data size exceeds
> 0x7E000000 bytes.
> Status CompressCatalogObject(const uint8_t* src, uint32_t size, std::string*
> dst)
> WARN_UNUSED_RESULT;
> {code}
>
> CatalogServer::AddPendingTopicItem() calls CompressCatalogObject()
>
> {code:java}
> // Add a catalog update to pending_topic_updates_.
> extern "C"
> JNIEXPORT jboolean JNICALL
> Java_org_apache_impala_service_FeSupport_NativeAddPendingTopicItem(JNIEnv*
> env,
> jclass caller_class, jlong native_catalog_server_ptr, jstring key, jlong
> version,
> jbyteArray serialized_object, jboolean deleted) {
> std::string key_string;
> {
> JniUtfCharGuard key_str;
> if (!JniUtfCharGuard::create(env, key, &key_str).ok()) {
> return static_cast<jboolean>(false);
> }
> key_string.assign(key_str.get());
> }
> JniScopedArrayCritical obj_buf;
> if (!JniScopedArrayCritical::Create(env, serialized_object, &obj_buf)) {
> return static_cast<jboolean>(false);
> }
> reinterpret_cast<CatalogServer*>(native_catalog_server_ptr)->
> AddPendingTopicItem(std::move(key_string), version, obj_buf.get(),
> static_cast<uint32_t>(obj_buf.size()), deleted);
> return static_cast<jboolean>(true);
> }
> {code}
> However the JNI call to AddPendingTopicItem discards the return value.
> Recently the return value was maintained due to IMPALA-10076:
> {code:java}
> - if (!FeSupport.NativeAddPendingTopicItem(nativeCatalogServerPtr,
> v1Key,
> - obj.catalog_version, data, delete)) {
> + int actualSize =
> FeSupport.NativeAddPendingTopicItem(nativeCatalogServerPtr,
> + v1Key, obj.catalog_version, data, delete);
> + if (actualSize < 0) {
> LOG.error("NativeAddPendingTopicItem failed in BE. key=" + v1Key +
> ", delete="
> + delete + ", data_size=" + data.length);
> + } else if (summary != null && obj.type == HDFS_PARTITION) {
> + summary.update(true, delete, obj.hdfs_partition.partition_name,
> + obj.catalog_version, data.length, actualSize);
> }
> }
> {code}
> CatalogServiceCatalog::addCatalogObject() now produces an error message but
> the Catalog update doesn't go through.
> {code:java}
> if (topicMode_ == TopicMode.FULL || topicMode_ == TopicMode.MIXED) {
> String v1Key = CatalogServiceConstants.CATALOG_TOPIC_V1_PREFIX + key;
> byte[] data = serializer.serialize(obj);
> int actualSize =
> FeSupport.NativeAddPendingTopicItem(nativeCatalogServerPtr,
> v1Key, obj.catalog_version, data, delete);
> if (actualSize < 0) {
> LOG.error("NativeAddPendingTopicItem failed in BE. key=" + v1Key +
> ", delete="
> + delete + ", data_size=" + data.length);
> } else if (summary != null && obj.type == HDFS_PARTITION) {
> summary.update(true, delete, obj.hdfs_partition.partition_name,
> obj.catalog_version, data.length, actualSize);
> }
> }
> {code}
> Not sure what the right behavior would be, we could handle the compression
> issue and try more aggressive compression, or unblock the catalog update.
>
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