add tag 0.8.2.1
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+# tag 0.8.2.1 (20181027)
+
+download:
+
+http://palo-opensource-bj.bj.bcebos.com/palo-0.8.2.1-release-20181027.tar.gz?authorization=bce-auth-v1/069fc2786e464e63a5f1183824ddb522/2018-10-27T09:06:12Z/-1/host/d9ebd01de7e266946e6dd1f2fb6951e92d4a8cd0a7b437253f9e0dcc3efe7039
+
+1. Added:
+
+ * Using MAVEN instead of ANT to build Frontend and Apache HDFS broker project.
+ * Add 2 new proc '/current\_queries' and '/current\_backend\_instances' to monitor the current running queries.
+ * Add a manual compaction api on Backend to trigger cumulative and base compaction manually.
+ * Add Frontend config 'max\_bytes\_per\_broker\_scanner' to limit the loading bytes per one broker scanner. This is to limit the memory cost of a single broker load job.
+ * Add Frontend config 'max\_unfinished\_load\_job' to limit load job number. If number of running load jobs exceed the limit, no more load job is allowed to be submmitted.
+ * Exposure backend info to user when encounter errors on Backend, for debugging it more convenient.
+ * Add 3 new metrics of Backends: host\_fd\_metrics, process\_fd\_metrics and process\_thread\_metrics, to monitor open files number and threads number.
+ * Support getting column size and precision info of table or view using JDBC.
+
+2. Updated:
+
+ * Hide password and other sensitive information in fe.log and fe.audit.log.
+ * Change the promethues type name 'GAUGE' to lowercase, to fit the latest promethues version.
+ * Backend ip saved in FE will be compared with BE's local ip when heartbeating, to avoid false positive heartbeat response.
+ * Using version\_num of tablet instead of calculating nice value to select cumulative compaction candicates.
+
+3. Fixed
+
+ * Fix privilege logic error:
+ 1. No one can set root password expect for root user itself.
+ 2. NODE\_PRIV cannot be granted.
+ 3. ADMIN\_PRIV and GRANT\_PRIV can only be granted or revoked on \*.\*.
+ 4. No one can modifly privs of default role 'operator' and 'admin'.
+ 5. No user can be granted to role 'operator'.
+ * Missing password and auth check when handling mini load request in Frontend.
+ * DomainResolver should start after Frontend transfering to a certain ROLE, not in Catalog construction methods.
+ * Fix a bug that read null data twice:
+ When reading data with a null value, in some cases, the same data will be read twice by the storage engine,
+ resulting in a wrong result. The reason for this problem is that when splitting,
+ and the start key is the minimum value, the data with null is read.
+ * Fixed a mem leak of using ByteBuf when parsing auth info of http request.
+ * Backend process should crash if failed to saving tablet's header.
+ * Should remove fd from map when input stream or output stream is closed in Broker process.
+ * Predicates should not be pushed down to subquery which contains limit clause.
+ * Fix the formula of calculating BE load score.
+ * Fix a bug that in some edge cases, non-master Fontend may wait for a unnecessary long timeout after forwarding cmd to Master FE.
+ * Fix a bug that granting privs on more than one table does not work.
+ * Support 'Insert into' table which contains HLL columns.
+ * ExportStmt's toSql() method may throw NullPointer Exception if table does not exist.
+ * Remove unnecessary 'get capacity' operation to avoid IO impact.
