Andrew Onischuk created AMBARI-9548:
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Summary: Updating FSRoot for Hive Metastore doesn't seem to work
(breaks Hive functionality after move NameNode and NameNode HA)
Key: AMBARI-9548
URL: https://issues.apache.org/jira/browse/AMBARI-9548
Project: Ambari
Issue Type: Bug
Reporter: Andrew Onischuk
Assignee: Andrew Onischuk
Fix For: 2.0.0
In hive_service.py, we have some logic to check and update FS root for Hive.
I believe this was added to handle the situation when the NameNode is moved.
I also think that this code would also automate updating the pointer to
nameservice ID rather than a specific namenode after enabling NameNode HA.
However, this code does not seem correct:
def check_fs_root():
import params
fs_root_url = format("{fs_root}{hive_apps_whs_dir}")
cmd = format("metatool -listFSRoot 2>/dev/null | grep hdfs:// | grep -v
'.db$'")
code, out = shell.call(cmd, user=params.hive_user)
if code == 0 and fs_root_url.strip() != out.strip():
cmd = format("metatool -updateLocation {fs_root}{hive_apps_whs_dir}
{out}")
Execute(cmd,
environment= {'PATH' : params.execute_path },
user=params.hive_user)
Problem 1: "metatool" is not in the PATH for Hive user, so this does not run.
Problem 2: "metatool" is a wrapper around "hive --service metatool". However,
it does not take any arguments for the hive config directory. Simply running
"metatool -listRootFS", even if the correct PATH was set for metatool, uses
/etc/hive/conf. However, we do not set "hive.metastore.warehouse.dir"
parameter in that file. We need to explicitly use /etc/hive/conf.server.
/usr/hdp/current/hive-client/bin/metatool -listFSRoot
incorrectly yields
hdfs://yusaku-1.c.pramod-thangali.internal:8020/user/hive/warehouse
The above command is equivalent to:
hive --service metatool -listFSRoot
and shows the same incorrect output.
The following correctly shows the fs root:
hive --config /etc/hive/conf.server--service metatool -listFSRoot
hdfs://yusaku-1.c.pramod-thangali.internal:8020/apps/hive/warehouse
Net net, we should be using "hive" command with config correctly set, rather
than the "metatool" wrapper.
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