A.2. Tungsten Replicator 5.2.0 GA (19 July 2017)

Tungsten Replication 5.2.0 is a new feature release that contains a combination of new features, specifically new replicator applier targets:

This release also provides improvements to the trepctl and thl commands, and bug fixes to improve stability.

Improvements, new features and functionality

  • Command-line Tools

    • The trepctl command has been updated to provide clearer and more detailed information on certain aspects of it's operation. Two new commands have been added, trepctl qs and trepctl perf:

      • The trepctl command has been updated to provide a simplified status output that provides an easier to understand status, using the qs command. For example:

        shell> trepctl qs
        State: alpha Online for 1172.724s, running for 124280.671s
        Latency: 0.71s from source DB commit time on thl://ubuntuheterosrc:2112/ into target database
         7564.198s since last source commit
        Sequence: 4860 last applied, 0 transactions behind (0-4860 stored) estimate 0.00s before synchronization
      • The trepctl perf command provides detailed performance information on the operation and status of the replicator and individual stages. This can be useful to identify where any additional latency or performance issues lie:

        shell> trepctl perf
        Statistics since last put online 1360.141s ago
        Stage | Seqno | Latency | Events | Extraction | Filtering | Applying | Other | Total
        remote-to-thl | 4860 | 0.475s | 70 | 116713.145s | 0.000s | 2.920s | 0.000s | 116716.065s
         Avg time per Event | 1667.331s | 0.000s | 0.000s | 0.042s | 1667.372s
        thl-to-q | 4860 | 0.527s | 3180 | 113842.933s | 0.011s | 2873.039s | 0.102s | 116716.085s
         Avg time per Event | 35.800s | 0.000s | 0.000s | 0.903s | 36.703s
        q-to-dbms | 4860 | 0.536s | 3180 | 112989.667s | 0.010s | 3701.035s | 25.554s | 116716.266s
         Avg time per Event | 35.531s | 0.000s | 0.008s | 1.164s | 36.703s

      Issues: CT-29

    • A number of improvements have been made to the identification of long running transactions within the replicator:

      • A new field has been added to the output of trepctl status -name tasks:

        timeInCurrentEvent : 6571.462

        This shows the time that the replictor has been processing the current event. For a long-running event, it helps to indicate that the replicator is still processing the curent event. Note that this is a just a counter for how low the current event has been running. For a replicator that is idle, this will show the time the replicator has spent both processing the original event and waiting to process the new event.

      • The thl list has been expanded to provide simple and detailed THL size information so that large transactions can be identified. Using the -sizes and -sizesdetail displays detailed information about the size of the SQL, number of rows, or both for each stored event. For example:

        shell> thl list -sizes
        SEQ# Frag# Tstamp
        12 0 2017-06-28 13:21:11.0 Event total: 1 chunks 73 bytes in SQL statements 0 rows
        13 0 2017-06-28 13:21:10.0 Event total: 1645 chunks 0 bytes in SQL statements 1645 rows
        14 0 2017-06-28 13:21:11.0 Event total: 1 chunks 36 bytes in SQL statements 0 rows

        For more information, see thl list -sizes Command and thl list -sizesdetail Command.

      • The trepctl command has been updated to provide more detailed information on the performance of the replicator, see trepctl perf.

      • For easier navigation and selection of THL events, the thl has had two further command-line options added, -first and -last to select the first and last events in the THL. Both also take an optional number that shows the first N or last N events.

      Issues: CT-34

    • A new command, tungsten_send_diag, has been added that provides a simplified method for sending a tpm diag output automatically through to the support team. The new command uploads the diagnostic information directly in Amazon S3 without requiring a separate upload to Zendesk.

      Issues: CT-158

    • A new command, clean_release_directory has been added to the distribution. This command removes old releases from the installation directory that have been created during either upgrades or configuration updates. The command removes all old entries except the current active one, and the last five entries.

      Issues: CT-204

  • Heterogeneous Replication

    • A new applier has been added to Tungsten Replicator that applies data directly into Cassandra. Data is loaded using a batch applier that writes the data through staging tables into Cassandra.

      Issues: CT-43

      For more information, see Section 6.11, “Deploying MySQL to Cassandra Replication”.

    • A new applier has been added to Tungsten Replicator that applies data directly into Kafka. Incoming row data is converted into a JSON document which is then embedded into a Kafka message and sent on a topic using the schema and table name.

      Issues: CT-101

      For more information, see Section 6.10, “Deploying MySQL to Kafka Replication”.

    • Tungsten Replication has been certified compatible with Vertica 8 using the existing vertica6.js batch-loading script.

      Issues: CT-152

    • A new applier has been added to Tungsten Replicator that applies data directly into Elasticsearch. Incoming row data is converted into a JSON document and then uploaded directly into an Elasticsearch index and type according either to explicitly settings, or based automatically on the schema and table name.

      Issues: CT-220

      For more information, see Section 6.9, “Deploying MySQL to Elasticsearch Replication”.

  • Filters

  • Documentation

    • The documentation has been updated to make the use of the --property option to tpm.

      Issues: CT-180

Bug Fixes

  • Command-line Tools

    • The tungsten_provision_slave command could hang during the execution of an external command which could cause the entire process to fail to complete properly.

      Issues: CT-82

    • When a replicator has been configured a cluster slave, the masterListenUri would be blank. This was because a pure cluster-slave configuration did not correctly configure the necessary pipelines.

      Issues: CT-197

    • The query tool has been updated to provide better error handling and messages during an error. This particularly affects tools which embed the use of this command, such as tungsten_provision_slave.

      Issues: CT-203

    • An auto-refresh option has been added to certain commands within trepctl. By adding the -r option and the number of seconds to either trepctl status, trepctl qs, or trepctl perf commands. For example, trepctl qs -r 5 would refresh the quick status command every 5 seconds.

      Issues: CT-209