[
https://issues.apache.org/jira/browse/ARROW-5302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jorge updated ARROW-5302:
-------------------------
Description:
The following piece of code (running on a Linux, Python 3.6 from anaconda)
demonstrates a memory leak when reading data from disk.
{code:java}
import resource
import pandas as pd
import pyarrow as pa
import pyarrow.parquet as pq
# some random data, some of them as array columns
path = 'data.parquet'
batches = 5000
df = pd.DataFrame({
't': [list(range(0, 180 * 60, 5))] * batches,
})
pq.write_table(pa.Table.from_pandas(df), path)
table = pq.read_table(path)
# read the data above and convert it to json (e.g. the backend of a restful API)
for i in range(100):
# comment any of the 2 lines for the leak to vanish.
df = pq.read_table(path).to_pandas()
df['t'].to_json()
print(resource.getrusage(resource.RUSAGE_SELF).ru_maxrss)
{code}
Result :
{code:java}
481676
618584
755396
892156
1028892
1165660
1302428
1439184
1620376
1801340
...{code}
Relevant pip freeze:
pyarrow (0.13.0)
pandas (0.24.2)
was:
The following piece of code (running on a Linux, Python 3.6 from anaconda)
demonstrates a memory leak when reading data from disk.
{code:java}
import resource
import pandas as pd
import pyarrow as pa
import pyarrow.parquet as pq
# some random data, some of them as array columns
path = 'data.parquet'
batches = 5000
df = pd.DataFrame({
'a': ['AA%d' % i for i in range(batches)],
't': [list(range(0, 180 * 60, 5))] * batches,
'v': list(pd.np.random.normal(10, 0.1, size=(batches, 180 * 60 //
5))),
'u': ['t'] * batches,
})
pq.write_table(pa.Table.from_pandas(df), path)
# read the data above and convert it to json (e.g. the backend of a restful API)
for i in range(100):
# comment any of the 2 lines for the leak to vanish.
df = pq.read_table(path).to_pandas()
df.to_json()
print(resource.getrusage(resource.RUSAGE_SELF).ru_maxrss)
{code}
Result :
{code:java}
785560
1065460
1383532
1607676
1924820
...{code}
Relevant pip freeze:
pyarrow (0.13.0)
pandas (0.24.2)
> Memory leak when read_table().to_pandas().to_json()
> ---------------------------------------------------
>
> Key: ARROW-5302
> URL: https://issues.apache.org/jira/browse/ARROW-5302
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.13.0
> Environment: Linux, Python 3.6.4 :: Anaconda, Inc.
> Reporter: Jorge
> Priority: Major
> Labels: memory-leak
>
> The following piece of code (running on a Linux, Python 3.6 from anaconda)
> demonstrates a memory leak when reading data from disk.
> {code:java}
> import resource
> import pandas as pd
> import pyarrow as pa
> import pyarrow.parquet as pq
> # some random data, some of them as array columns
> path = 'data.parquet'
> batches = 5000
> df = pd.DataFrame({
> 't': [list(range(0, 180 * 60, 5))] * batches,
> })
> pq.write_table(pa.Table.from_pandas(df), path)
> table = pq.read_table(path)
> # read the data above and convert it to json (e.g. the backend of a restful
> API)
> for i in range(100):
> # comment any of the 2 lines for the leak to vanish.
> df = pq.read_table(path).to_pandas()
> df['t'].to_json()
> print(resource.getrusage(resource.RUSAGE_SELF).ru_maxrss)
> {code}
> Result :
> {code:java}
> 481676
> 618584
> 755396
> 892156
> 1028892
> 1165660
> 1302428
> 1439184
> 1620376
> 1801340
> ...{code}
> Relevant pip freeze:
> pyarrow (0.13.0)
> pandas (0.24.2)
>
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