aimahou created YARN-10298:
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Summary: TimeLine entity information only stored in one region
when use apache HBase as backend storage
Key: YARN-10298
URL: https://issues.apache.org/jira/browse/YARN-10298
Project: Hadoop YARN
Issue Type: Improvement
Components: ATSv2, timelineservice
Affects Versions: 3.1.1
Reporter: aimahou
h2. Issue
TimeLine entity information only stored in one region when use apache HBase as
backend storage
h2. Probable cause
We found in the source code that the rowKey is composed of
clusterId、userId、flowName、flowRunId and appId when hbase timeline writer stores
timeline entity info，which probably cause the rowKey is sorted by dictionary
order. Thus timeline entity may only store in one region or few adjacent
regions.
h2. Related code snippet
HBaseTimelineWriterImpl.java
public TimelineWriteResponse write(TimelineCollectorContext context,
TimelineEntities data, UserGroupInformation callerUgi)
throws IOException {
...
boolean isApplication = ApplicationEntity.isApplicationEntity(te);
byte[] rowKey;
if (isApplication) {
ApplicationRowKey applicationRowKey =
new ApplicationRowKey(clusterId, userId, flowName, flowRunId,
appId);
rowKey = applicationRowKey.getRowKey();
store(rowKey, te, flowVersion, Tables.APPLICATION_TABLE);
} else {
EntityRowKey entityRowKey =
new EntityRowKey(clusterId, userId, flowName, flowRunId, appId,
te.getType(), te.getIdPrefix(), te.getId());
rowKey = entityRowKey.getRowKey();
store(rowKey, te, flowVersion, Tables.ENTITY_TABLE);
}
if (!isApplication && SubApplicationEntity.isSubApplicationEntity(te)) {
SubApplicationRowKey subApplicationRowKey =
new SubApplicationRowKey(subApplicationUser, clusterId,
te.getType(), te.getIdPrefix(), te.getId(), userId);
rowKey = subApplicationRowKey.getRowKey();
store(rowKey, te, flowVersion, Tables.SUBAPPLICATION_TABLE);
}
...
}
h2. Suggestion
We can use the hash code of original rowKey as the rowKey to store and read
timeline entity data.
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