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https://issues.apache.org/jira/browse/HBASE-27698?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HBASE-27698:
-----------------------------------
Labels: pull-request-available (was: )
> Migrate meta locations from zookeeper to master data may not always possible
> if we migrate from 1.x HBase
> ---------------------------------------------------------------------------------------------------------
>
> Key: HBASE-27698
> URL: https://issues.apache.org/jira/browse/HBASE-27698
> Project: HBase
> Issue Type: Bug
> Components: migration
> Affects Versions: 2.5.0
> Reporter: Rajeshbabu Chintaguntla
> Assignee: Rajeshbabu Chintaguntla
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.7.0
>
>
> In HBase 1.x versions meta server location from zookeeper will be removed
> when the server stopped. In such cases migrating to 2.5.x branches may not
> create any meta entries in master data. So in case if we could not find the
> meta location from zookeeper we can get meta location from wal directories
> with .meta extension and add to master data.
> {noformat}
> private void tryMigrateMetaLocationsFromZooKeeper() throws IOException,
> KeeperException {
> // try migrate data from zookeeper
> try (ResultScanner scanner =
> masterRegion.getScanner(new
> Scan().addFamily(HConstants.CATALOG_FAMILY))) {
> if (scanner.next() != null) {
> // notice that all replicas for a region are in the same row, so the
> migration can be
> // done with in a one row put, which means if we have data in catalog
> family then we can
> // make sure that the migration is done.
> LOG.info("The {} family in master local region already has data in
> it, skip migrating...",
> HConstants.CATALOG_FAMILY_STR);
> return;
> }
> }
> // start migrating
> byte[] row =
> CatalogFamilyFormat.getMetaKeyForRegion(RegionInfoBuilder.FIRST_META_REGIONINFO);
> Put put = new Put(row);
> List<String> metaReplicaNodes = zooKeeper.getMetaReplicaNodes();
> StringBuilder info = new StringBuilder("Migrating meta locations:");
> for (String metaReplicaNode : metaReplicaNodes) {
> int replicaId =
> zooKeeper.getZNodePaths().getMetaReplicaIdFromZNode(metaReplicaNode);
> RegionState state = MetaTableLocator.getMetaRegionState(zooKeeper,
> replicaId);
> info.append(" ").append(state);
> put.setTimestamp(state.getStamp());
> MetaTableAccessor.addRegionInfo(put, state.getRegion());
> if (state.getServerName() != null) {
> MetaTableAccessor.addLocation(put, state.getServerName(),
> HConstants.NO_SEQNUM, replicaId);
> }
>
> put.add(CellBuilderFactory.create(CellBuilderType.SHALLOW_COPY).setRow(put.getRow())
> .setFamily(HConstants.CATALOG_FAMILY)
>
> .setQualifier(RegionStateStore.getStateColumn(replicaId)).setTimestamp(put.getTimestamp())
>
> .setType(Cell.Type.Put).setValue(Bytes.toBytes(state.getState().name())).build());
> }
> if (!put.isEmpty()) {
> LOG.info(info.toString());
> masterRegion.update(r -> r.put(put));
> } else {
> LOG.info("No meta location available on zookeeper, skip migrating...");
> }
> }
> {noformat}
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