[jira] [Work started] (HIVE-20888) TxnHandler: sort() called on immutable lists

["Igor Kryvenko (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-20888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-20888 started by Igor Kryvenko.
--------------------------------------------
> TxnHandler: sort() called on immutable lists
> --------------------------------------------
>
>                 Key: HIVE-20888
>                 URL: https://issues.apache.org/jira/browse/HIVE-20888
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>            Reporter: Gopal V
>            Assignee: Igor Kryvenko
>            Priority: Major
>
> {code}
>         } else {
>           assert (!rqst.isSetSrcTxnToWriteIdList());
>           assert (rqst.isSetTxnIds());
>           txnIds = rqst.getTxnIds();
>         }
>         Collections.sort(txnIds); //easier to read logs and for assumption done in replication flow
> {code}
> when the input comes from
> {code}
>   @Override
>   public long allocateTableWriteId(long txnId, String dbName, String tableName) throws TException {
>     return allocateTableWriteIdsBatch(Collections.singletonList(txnId), dbName, tableName).get(0).getWriteId();
>   }
> {code}
> {code}
> java.lang.UnsupportedOperationException: null
>     at java.util.AbstractList.set(AbstractList.java:132) ~[?:1.8.0]
>     at java.util.AbstractList$ListItr.set(AbstractList.java:426) ~[?:1.8.0]
>     at java.util.Collections.sort(Collections.java:170) ~[?:1.8.0]
>     at org.apache.hadoop.hive.metastore.txn.TxnHandler.allocateTableWriteIds(TxnHandler.java:1523) ~[hive-standalone-metastore-server-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
>     at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.allocate_table_write_ids(HiveMetaStore.java:7349) ~[hive-standalone-metastore-server-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
> {code}



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