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https://issues.apache.org/jira/browse/HDDS-4477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lokesh Jain updated HDDS-4477:
------------------------------
Summary: Delete txnId in SCMMetadataStoreImpl may drop to 0 after SCM
restart. (was: txID in SCMMetadataStoreImpl may drop to 0 after a SCM restart.)
> Delete txnId in SCMMetadataStoreImpl may drop to 0 after SCM restart.
> ---------------------------------------------------------------------
>
> Key: HDDS-4477
> URL: https://issues.apache.org/jira/browse/HDDS-4477
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: SCM
> Affects Versions: 1.1.0
> Reporter: Glen Geng
> Assignee: Lokesh Jain
> Priority: Major
>
> *Summary*
> If SCM cleans up all the DeletedBlocksTransaction in deletedBlocksTable, then
> restart, the txID in SCMMetadataStoreImpl will drop to 0.
>
> *Detail*
> in SCMMetadataStoreImpl.java
> {code:java}
> public SCMMetadataStoreImpl(OzoneConfiguration config)
> throws IOException {
> this.configuration = config;
> start(this.configuration);
> this.txID = new AtomicLong(this.getLargestRecordedTXID());
> }
> private Long getLargestRecordedTXID() throws IOException {
> try (TableIterator<Long, ? extends KeyValue<Long, DeletedBlocksTransaction>>
> txIter = deletedBlocksTable.iterator()) {
> txIter.seekToLast();
> Long txid = txIter.key();
> if (txid != null) {
> return txid;
> }
> }
> return 0L;
> }{code}
>
> in DeletedBlockLogImpl.java
> {code:java}
> public void commitTransactions(
> List<DeleteBlockTransactionResult> transactionResults, UUID dnID) {
> ...
> scmMetadataStore.getDeletedBlocksTXTable().delete(txID);
> ...
> }{code}
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